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Shuffling the images

I've made a picture puzzle game. actually I use Netbeans 8.2 GUI Builder to create the game, I have made Timer and move.
But I am confused how to shuffle the images. I've searched on various sites but it did not help.
This is my code:
package projetu;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.Timer;
import static projetu.fasil.cont;
public class t02 extends javax.swing.JFrame {
static int cont = 0;
int i = 0;
private Timer timer;
private int currentSegundo = 0;
private int currentMinuto = 0;
private int currentHora = 0;
private int velocidade = 1000;
public t02() {
initComponents();
b9.setVisible(false);
}
public void contamuda() {
txtconta.setText(String.valueOf(cont++));
}
private void iniciarContagem() {
ActionListener action;
action = new ActionListener() {
public void actionPerformed(ActionEvent e) {
currentSegundo++;
if (currentSegundo == 60) {
currentMinuto++;
currentSegundo = 0;
}
if (currentMinuto == 60) {
currentHora++;
currentMinuto = 0;
}
String hr = currentHora <= 9 ? "0" + currentHora : currentHora + "";
String min = currentMinuto <= 9 ? "0" + currentMinuto : currentMinuto + "";
String seg = currentSegundo <= 9 ? "0" + currentSegundo : currentSegundo + "";
tempu.setText(hr + ":" + min + ":" + seg);
}
};
this.timer = new Timer(velocidade, action);
this.timer.start();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
b1 = new javax.swing.JButton();
b2 = new javax.swing.JButton();
b3 = new javax.swing.JButton();
b4 = new javax.swing.JButton();
b5 = new javax.swing.JButton();
b6 = new javax.swing.JButton();
b7 = new javax.swing.JButton();
b8 = new javax.swing.JButton();
b9 = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
txtconta = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
tempu = new javax.swing.JLabel();
jPanel2 = new javax.swing.JPanel();
jLabel3 = new javax.swing.JLabel();
jPanel3 = new javax.swing.JPanel();
jButton1 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jLabel4 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setLayout(new java.awt.GridLayout(3, 3));
b1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t11.gif"))); // NOI18N
b1.setBorder(null);
b1.setBorderPainted(false);
b1.setContentAreaFilled(false);
b1.setFocusable(false);
b1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b1ActionPerformed(evt);
}
});
jPanel1.add(b1);
b2.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t12.gif"))); // NOI18N
b2.setBorder(null);
b2.setBorderPainted(false);
b2.setContentAreaFilled(false);
b2.setFocusable(false);
b2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b2ActionPerformed(evt);
}
});
jPanel1.add(b2);
b3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t13.gif"))); // NOI18N
b3.setBorder(null);
b3.setBorderPainted(false);
b3.setContentAreaFilled(false);
b3.setFocusable(false);
b3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b3ActionPerformed(evt);
}
});
jPanel1.add(b3);
b4.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t14.gif"))); // NOI18N
b4.setBorder(null);
b4.setBorderPainted(false);
b4.setContentAreaFilled(false);
b4.setFocusable(false);
b4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b4ActionPerformed(evt);
}
});
jPanel1.add(b4);
b5.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t15.gif"))); // NOI18N
b5.setBorder(null);
b5.setBorderPainted(false);
b5.setContentAreaFilled(false);
b5.setFocusable(false);
b5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b5ActionPerformed(evt);
}
});
jPanel1.add(b5);
b6.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t16.gif"))); // NOI18N
b6.setBorder(null);
b6.setBorderPainted(false);
b6.setContentAreaFilled(false);
b6.setFocusable(false);
b6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b6ActionPerformed(evt);
}
});
jPanel1.add(b6);
b7.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t17.gif"))); // NOI18N
b7.setBorder(null);
b7.setBorderPainted(false);
b7.setContentAreaFilled(false);
b7.setFocusable(false);
b7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b7ActionPerformed(evt);
}
});
jPanel1.add(b7);
b8.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t18.gif"))); // NOI18N
b8.setBorder(null);
b8.setBorderPainted(false);
b8.setContentAreaFilled(false);
b8.setFocusable(false);
b8.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b8ActionPerformed(evt);
}
});
jPanel1.add(b8);
b9.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais/t19.gif"))); // NOI18N
b9.setBorder(null);
b9.setBorderPainted(false);
b9.setContentAreaFilled(false);
b9.setFocusable(false);
b9.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b9ActionPerformed(evt);
}
});
jPanel1.add(b9);
jLabel1.setFont(new java.awt.Font("Trebuchet MS", 1, 36)); // NOI18N
jLabel1.setText("Muda :");
txtconta.setFont(new java.awt.Font("Trebuchet MS", 1, 36)); // NOI18N
txtconta.setText("0");
jLabel2.setFont(new java.awt.Font("Trebuchet MS", 1, 36)); // NOI18N
jLabel2.setText("Tempu =");
tempu.setFont(new java.awt.Font("Trebuchet MS", 1, 36)); // NOI18N
tempu.setText("00:00:00");
jLabel3.setIcon(new javax.swing.ImageIcon(getClass().getResource("/tais01/t02_lbl.jpg"))); // NOI18N
jLabel3.setAutoscrolls(true);
jLabel3.setBorder(javax.swing.BorderFactory.createEtchedBorder(javax.swing.border.EtchedBorder.RAISED));
jLabel3.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addComponent(jLabel3)
.addGap(0, 89, Short.MAX_VALUE))
);
jButton1.setFont(new java.awt.Font("Trebuchet MS", 1, 18)); // NOI18N
jButton1.setText("Komesa");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton3.setFont(new java.awt.Font("Trebuchet MS", 1, 18)); // NOI18N
jButton3.setText("Valor");
jButton4.setFont(new java.awt.Font("Trebuchet MS", 1, 18)); // NOI18N
jButton4.setText("Sai ");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
jButton2.setFont(new java.awt.Font("Trebuchet MS", 1, 18)); // NOI18N
jButton2.setText("Hili Imagen");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel3Layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton4)
.addContainerGap())
);
jLabel4.setFont(new java.awt.Font("Trebuchet MS", 1, 36)); // NOI18N
jLabel4.setText("Game puzzle tais no uma adat iha Timor Leste");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 122, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(txtconta, javax.swing.GroupLayout.PREFERRED_SIZE, 85, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(52, 52, 52)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(tempu))
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 639, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 0, Short.MAX_VALUE))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel4, javax.swing.GroupLayout.DEFAULT_SIZE, 56, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 413, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 52, Short.MAX_VALUE)
.addComponent(txtconta, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(tempu, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
pack();
}// </editor-fold>
private void b1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b2.isVisible() == false) {
b2.setText(b1.getText());
b2.setIcon(b1.getIcon());
b1.setVisible(false);
b2.setVisible(true);
}
if (b4.isVisible() == false) {
b4.setText(b1.getText());
b4.setIcon(b1.getIcon());
b1.setVisible(false);
b4.setVisible(true);
}
}
private void b2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b1.isVisible() == false) {
b1.setText(b2.getText());
b1.setIcon(b2.getIcon());
b2.setVisible(false);
b1.setVisible(true);
}
if (b3.isVisible() == false) {
b3.setText(b2.getText());
b3.setIcon(b2.getIcon());
b2.setVisible(false);
b3.setVisible(true);
}
if (b5.isVisible() == false) {
b5.setText(b2.getText());
b5.setIcon(b2.getIcon());
b2.setVisible(false);
b5.setVisible(true);
}
}
private void b3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b2.isVisible() == false) {
b2.setText(b3.getText());
b2.setIcon(b3.getIcon());
b3.setVisible(false);
b2.setVisible(true);
}
if (b6.isVisible() == false) {
b6.setText(b3.getText());
b6.setIcon(b3.getIcon());
b3.setVisible(false);
b6.setVisible(true);
}
}
private void b4ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b1.isVisible() == false) {
b1.setText(b4.getText());
b1.setIcon(b4.getIcon());
b4.setVisible(false);
b1.setVisible(true);
}
if (b5.isVisible() == false) {
b5.setText(b4.getText());
b5.setIcon(b4.getIcon());
b4.setVisible(false);
b5.setVisible(true);
}
if (b7.isVisible() == false) {
b7.setText(b4.getText());
b7.setIcon(b4.getIcon());
b4.setVisible(false);
b7.setVisible(true);
}
}
private void b5ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b2.isVisible() == false) {
b2.setText(b5.getText());
b2.setIcon(b5.getIcon());
b5.setVisible(false);
b2.setVisible(true);
}
if (b4.isVisible() == false) {
b4.setText(b4.getText());
b4.setIcon(b4.getIcon());
b5.setVisible(false);
b4.setVisible(true);
}
if (b6.isVisible() == false) {
b6.setText(b5.getText());
b6.setIcon(b5.getIcon());
b5.setVisible(false);
b6.setVisible(true);
}
if (b8.isVisible() == false) {
b8.setText(b5.getText());
b8.setIcon(b5.getIcon());
b5.setVisible(false);
b8.setVisible(true);
}
}
private void b6ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b9.isVisible() == false) {
b9.setText(b6.getText());
b9.setIcon(b6.getIcon());
b6.setVisible(false);
b9.setVisible(true);
}
if (b3.isVisible() == false) {
b3.setText(b6.getText());
b3.setIcon(b6.getIcon());
b6.setVisible(false);
b3.setVisible(true);
}
if (b5.isVisible() == false) {
b5.setText(b6.getText());
b5.setIcon(b6.getIcon());
b6.setVisible(false);
b5.setVisible(true);
}
}
private void b7ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b4.isVisible() == false) {
b4.setText(b7.getText());
b4.setIcon(b7.getIcon());
b7.setVisible(false);
b4.setVisible(true);
}
if (b8.isVisible() == false) {
b8.setText(b7.getText());
b8.setIcon(b7.getIcon());
b7.setVisible(false);
b8.setVisible(true);
}
}
private void b8ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b5.isVisible() == false) {
b5.setText(b8.getText());
b5.setIcon(b8.getIcon());
b8.setVisible(false);
b5.setVisible(true);
}
if (b7.isVisible() == false) {
b7.setText(b7.getText());
b7.setIcon(b7.getIcon());
b8.setVisible(false);
b7.setVisible(true);
}
if (b9.isVisible() == false) {
b9.setText(b8.getText());
b9.setIcon(b8.getIcon());
b8.setVisible(false);
b9.setVisible(true);
}
}
private void b9ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
contamuda();
if (b6.isVisible() == false) {
b6.setText(b9.getText());
b6.setIcon(b9.getIcon());
b9.setVisible(false);
b6.setVisible(true);
}
if (b8.isVisible() == false) {
b8.setText(b9.getText());
b8.setIcon(b9.getIcon());
b9.setVisible(false);
b8.setVisible(true);
}
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
iniciarContagem();
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
new hili_imagen().setVisible(true);
dispose();
}
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
new game().setVisible(true);
dispose();
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(t02.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(t02.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(t02.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(t02.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new t02().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton b1;
private javax.swing.JButton b2;
private javax.swing.JButton b3;
private javax.swing.JButton b4;
private javax.swing.JButton b5;
private javax.swing.JButton b6;
private javax.swing.JButton b7;
private javax.swing.JButton b8;
private javax.swing.JButton b9;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JPanel jPanel3;
private javax.swing.JLabel tempu;
private javax.swing.JLabel txtconta;
// End of variables declaration
}

RMI ClassCastException to remote interface

Hi i am having a problem with RMI.
I have this error when i run it.
java.lang.ClassCastException: com.sun.proxy.$Proxy0 cannot be cast to rmi.converter
This is the interface
converter.java
import java.rmi.RemoteException;
public interface converter {
double CelciusKelvin (double a) throws RemoteException;
double CelciusFahrenheit (double a) throws RemoteException;
double FahrenheitKelvin (double a) throws RemoteException;
double FahrenheitCelcius (double a) throws RemoteException;
double KelvinCelcius (double a) throws RemoteException;
double KelvinFahrenheit (double a) throws RemoteException;
double AtmosPascal (double a) throws RemoteException;
double AtmosPSI (double a) throws RemoteException;
double PascalAtmos (double a) throws RemoteException;
double PascalPSI (double a) throws RemoteException;
double PSIAtmos (double a) throws RemoteException;
double PSIPascal (double a) throws RemoteException;
}
This is the remote method
converterImp.java
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
public class converterImp extends UnicastRemoteObject implements converter {
public converterImp() throws RemoteException
{
}
double convert;
#Override
public double CelciusKelvin(double a) throws RemoteException {
convert = a+273.15;
return convert;
}
#Override
public double CelciusFahrenheit(double a) throws RemoteException {
convert = (a*1.8)+32;
return convert;
}
#Override
public double FahrenheitKelvin(double a) throws RemoteException {
convert = (a+459.67)*5/9;
return convert;
}
#Override
public double FahrenheitCelcius(double a) throws RemoteException {
convert=(a-32)/(9/5);
return convert;
}
#Override
public double KelvinCelcius(double a) throws RemoteException {
convert = a - 273.15;
return convert;
}
#Override
public double KelvinFahrenheit(double a) throws RemoteException {
convert=(a-273.15)* 1.8 + 32.00;
return convert;
}
#Override
public double AtmosPascal(double a) throws RemoteException {
convert = a*101325;
return convert;
}
#Override
public double AtmosPSI(double a) throws RemoteException {
convert = a*14.6959488;
return convert;
}
#Override
public double PascalAtmos(double a) throws RemoteException {
convert = a/101325;
return convert;
}
#Override
public double PascalPSI(double a) throws RemoteException {
convert=a*0.000145037;
return convert;
}
#Override
public double PSIAtmos(double a) throws RemoteException {
convert = a*0.0680459639;
return convert;
}
#Override
public double PSIPascal(double a) throws RemoteException {
convert =a*6894.75729;
return convert;
}
}
This is my GUI Client.
package projectrmiclient;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import rmi.converter;
public class ProjectRMIClient extends javax.swing.JFrame {
public ProjectRMIClient() {
initComponents();
}
String num = "";
String str = "";
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jScrollPane1 = new javax.swing.JScrollPane();
jTextPane1 = new javax.swing.JTextPane();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6 = new javax.swing.JButton();
jButton7 = new javax.swing.JButton();
jButton8 = new javax.swing.JButton();
jButton9 = new javax.swing.JButton();
jButton10 = new javax.swing.JButton();
jButton11 = new javax.swing.JButton();
jLabel1 = new javax.swing.JLabel();
jButton12 = new javax.swing.JButton();
jButton13 = new javax.swing.JButton();
jButton14 = new javax.swing.JButton();
jButton15 = new javax.swing.JButton();
jButton16 = new javax.swing.JButton();
jButton17 = new javax.swing.JButton();
jButton18 = new javax.swing.JButton();
jButton19 = new javax.swing.JButton();
jButton20 = new javax.swing.JButton();
jButton21 = new javax.swing.JButton();
jButton22 = new javax.swing.JButton();
jButton23 = new javax.swing.JButton();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTextPane1.setEditable(false);
jScrollPane1.setViewportView(jTextPane1);
jButton1.setText("1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("2");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setText("3");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jButton4.setText("4");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
jButton5.setText("5");
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton5ActionPerformed(evt);
}
});
jButton6.setText("6");
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton6ActionPerformed(evt);
}
});
jButton7.setText("7");
jButton7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton7ActionPerformed(evt);
}
});
jButton8.setText("8");
jButton8.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton8ActionPerformed(evt);
}
});
jButton9.setText("9");
jButton9.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton9ActionPerformed(evt);
}
});
jButton10.setText("0");
jButton10.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton10ActionPerformed(evt);
}
});
jButton11.setText("Cancel");
jButton11.setToolTipText("");
jButton11.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton11ActionPerformed(evt);
}
});
jLabel1.setText("Temperature");
jButton12.setText("C~F");
jButton12.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton12ActionPerformed(evt);
}
});
jButton13.setText("F~C");
jButton14.setText("K~C");
jButton15.setText("C~K");
jButton16.setText("F~K");
jButton17.setText("K~F");
jButton18.setText("A~PSI");
jButton19.setText("PSI~A");
jButton20.setText("Pas~A");
jButton21.setText("A~Pas");
jButton22.setText("PSI-Pas");
jButton22.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton22ActionPerformed(evt);
}
});
jButton23.setText("Pas~A");
jLabel2.setText("Pressure");
jLabel3.setText("Result");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jLabel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel3, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 205, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jButton7, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButton11)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton8, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)))))
.addGap(36, 36, 36)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jButton18, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton19, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton20, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jButton22, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton21, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton23, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jLabel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton12, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton14, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(jButton13, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jButton16, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton15, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton17, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(jLabel2))
.addContainerGap(20, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(34, 34, 34)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 46, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton3)
.addComponent(jButton2)
.addComponent(jButton1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton4)
.addComponent(jButton5)
.addComponent(jButton6))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton7)
.addComponent(jButton8)
.addComponent(jButton9))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton11)
.addComponent(jButton10))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jLabel3))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(7, 7, 7)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton15)
.addComponent(jButton12))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton16)
.addComponent(jButton13))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton17)
.addComponent(jButton14))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jLabel2)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton18)
.addComponent(jButton21))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButton22)
.addComponent(jButton19))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton20)
.addComponent(jButton23))))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 52, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(20, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);
}
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);// TODO add your handling code here:
}
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);// TODO add your handling code here:
}
private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);// TODO add your handling code here:
}
private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);// TODO add your handling code here:
}
private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);// TODO add your handling code here:
}
private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);// TODO add your handling code here:
}
private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);// TODO add your handling code here:
}
private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {
str = evt.getActionCommand();
num = num + str;
jTextPane1.setText(num);// TODO add your handling code here:
}
private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {
jTextPane1.setText("");
}
private void jButton22ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton12ActionPerformed(java.awt.event.ActionEvent evt) {
try {
// fire to localhost port 1099
Registry myRegistry = LocateRegistry.getRegistry("127.0.0.1", 1099);
// search for myMessage service
converter impl = (converter) myRegistry.lookup("PTConverter");
if(!jTextPane1.getText().isEmpty())
{
double input = Double.parseDouble(jTextPane1.getText());
// call server's method
double result=impl.CelciusFahrenheit(input);
String answer = result + "Fahrenheit";
jLabel4.setText(answer);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ProjectRMIClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ProjectRMIClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ProjectRMIClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ProjectRMIClient.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ProjectRMIClient().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton10;
private javax.swing.JButton jButton11;
private javax.swing.JButton jButton12;
private javax.swing.JButton jButton13;
private javax.swing.JButton jButton14;
private javax.swing.JButton jButton15;
private javax.swing.JButton jButton16;
private javax.swing.JButton jButton17;
private javax.swing.JButton jButton18;
private javax.swing.JButton jButton19;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton20;
private javax.swing.JButton jButton21;
private javax.swing.JButton jButton22;
private javax.swing.JButton jButton23;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JButton jButton7;
private javax.swing.JButton jButton8;
private javax.swing.JButton jButton9;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextPane jTextPane1;
// End of variables declaration
}
I developed the GUI using GUI Builder on netbeans.
The problem is when i pressed jButton12. it will show the error as stated.

You appear to have created a copy of your remote interface in a different package for the client. You can't do that. The remote interface has to be the same on both sides: The Same, and that does not include changing its package, or indeed any anything else.

getText from GUI textfield error in java

I am doing a project where I have to convert a fraction into its lowest terms. I am experiencing errors with .getText from a JTextField. I printed their input and the input is being received as the properties rather than as a string. I am having problems with this code:
double userDenominator = Double.parseDouble(userDenominatorInput.getText());
this give the variable a value of
javax.swing.JTextField[,12,93,166x36,layout=javax.swing.plaf.basic.BasicTextUI$UpdateHandler,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.BorderUIResource$CompoundBorderUIResource#c112a58,flags=296,maximumSize=,minimumSize=,preferredSize=,caretColor=sun.swing.PrintColorUIResource[r=51,g=51,b=51],disabledTextColor=javax.swing.plaf.ColorUIResource[r=184,g=207,b=229],editable=true,margin=javax.swing.plaf.InsetsUIResource[top=0,left=0,bottom=0,right=0],selectedTextColor=sun.swing.PrintColorUIResource[r=51,g=51,b=51],selectionColor=javax.swing.plaf.ColorUIResource[r=184,g=207,b=229],columns=0,columnWidth=0,command=,horizontalAlignment=LEADING]
I was wondering if any problems could be caused by me using a GUI form or a key released listener.
Here is the full code separated into two classes:
package reducefraction;
public class ReduceFraction {
public static void main(String[] args) {
NewJFrame form = new NewJFrame();
form.setVisible(true);
form.setLocationRelativeTo(null);
}
}
Here is the second class
package reducefraction;
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
initComponents();
userDenominatorInput.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
userDenominatorInputKeyReleased(evt);
}
});
userNumeratorInput.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
userNumeratorInputKeyReleased(evt);
}
});
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jSeparator1 = new javax.swing.JSeparator();
userDenominatorInput = new javax.swing.JTextField();
jSeparator2 = new javax.swing.JSeparator();
numeratorOutput = new javax.swing.JTextField();
denominatorOutput = new javax.swing.JTextField();
jLabel3 = new javax.swing.JLabel();
userNumeratorInput = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Reduce Fractions");
jLabel2.setText("This program will reduce a fraction to its lowest terms");
userDenominatorInput.setFont(new java.awt.Font("Gabriola", 1, 24)); // NOI18N
userDenominatorInput.setForeground(new java.awt.Color(255, 102, 51));
numeratorOutput.setEditable(false);
numeratorOutput.setColumns(10);
numeratorOutput.setFont(new java.awt.Font("Gabriola", 1, 24)); // NOI18N
numeratorOutput.setForeground(new java.awt.Color(255, 102, 51));
denominatorOutput.setEditable(false);
denominatorOutput.setColumns(10);
denominatorOutput.setFont(new java.awt.Font("Gabriola", 1, 24)); // NOI18N
denominatorOutput.setForeground(new java.awt.Color(255, 102, 51));
jLabel3.setFont(new java.awt.Font("Tempus Sans ITC", 1, 36)); // NOI18N
jLabel3.setText("=");
userNumeratorInput.setFont(new java.awt.Font("Gabriola", 1, 24)); // NOI18N
userNumeratorInput.setForeground(new java.awt.Color(255, 102, 51));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(155, 155, 155)
.addComponent(jLabel1))
.addGroup(layout.createSequentialGroup()
.addGap(75, 75, 75)
.addComponent(jLabel2)))
.addGap(0, 82, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jSeparator1)
.addComponent(userDenominatorInput, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 166, Short.MAX_VALUE)
.addComponent(userNumeratorInput))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel3)
.addGap(29, 29, 29)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jSeparator2)
.addComponent(denominatorOutput, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(numeratorOutput, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 31, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(layout.createSequentialGroup()
.addComponent(userNumeratorInput, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 2, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(userDenominatorInput, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jSeparator2, javax.swing.GroupLayout.PREFERRED_SIZE, 2, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 14, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(denominatorOutput, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(numeratorOutput, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(50, 50, 50)))
.addGap(22, 22, 22))
);
pack();
}// </editor-fold>
**public void userDenominatorInputKeyReleased(java.awt.event.KeyEvent evt) {
double userDenominator = Double.parseDouble(userDenominatorInput.getText());
double userNumerator = Double.parseDouble(userNumeratorInput.getText());
calculate(userNumerator, userDenominator);
}
public void userNumeratorInputKeyReleased(java.awt.event.KeyEvent evt) {
double userDenominator = Double.parseDouble(userDenominatorInput.getText());
double userNumerator = Double.parseDouble(userNumeratorInput.getText());
calculate(userNumerator, userDenominator);
}
public void calculate(double userNumerator, double userDenominator) {
System.out.println(userNumeratorInput);
double a = userDenominator;
double b = userNumerator % userDenominator;
double c;
do {
c = a % b;
a = b;
b = c;
} while (a != 0);
int greatestCommonDenominator = (int) c;
double numeratorAnswer = userNumerator / greatestCommonDenominator;
double denominatorAnswer = userDenominator / greatestCommonDenominator;
numeratorOutput.setText(Double.toString(numeratorAnswer));
denominatorOutput.setText(Double.toString(denominatorAnswer));
}**
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField denominatorOutput;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JSeparator jSeparator1;
private javax.swing.JSeparator jSeparator2;
private javax.swing.JTextField numeratorOutput;
public javax.swing.JTextField userDenominatorInput;
private javax.swing.JTextField userNumeratorInput;
// End of variables declaration
}

The "probable" cause is the use of KeyListener on the text fields.
The main problem is you are not taking into account what should occur if one of the fields is empty, "" is not a valid number.
Don't use KeyListeners on text fields, if you want to perform real time updates on fields, you should be using a DocumentListener instead. KeyListener won't be notified if the the user pastes content into the field...
You should also consider using a JSpinner or a JFormattedField or even a DocumentFilter to restrict what the user can actually type into the fields
Something like...
if (!userDenominatorInput.getText().isEmpty() && !userNumeratorInput.getText().isEmpty()) {
double userDenominator = Double.parseDouble(userDenominatorInput.getText());
double userNumerator = Double.parseDouble(userNumeratorInput.getText());
calculate(userNumerator, userDenominator);
}
Should help...

MadProgrammer gave me the answer I needed that was causing the output of properties rather than a string. This Problem is solved by doing the .getText method as described here:
Don't use System.out.println(userNumeratorInput), it's calling userNumeratorInput.toString()which prints the properties of the text field, use ystem.out.println(userNumeratorInput.getText()) to print the text content of the field – MadProgrammer
Here is the correct code from my form class
package reducefraction;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
public class NewJFrame extends javax.swing.JFrame {
double userDenominator, userNumerator;
/**
* Creates new form NewJFrame
*/
public NewJFrame() {
initComponents();
// userDenominatorInput.addActionListener(new MyTextActionListener());
userDenominatorInput.getDocument().addDocumentListener(new MyDocumentListener());
userDenominatorInput.getDocument().putProperty("name", "Text Field");
/* userDenominatorInput.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
userDenominatorInputKeyReleased(evt);
}
});
*/
// userNumeratorInput.addActionListener(new MyTextActionListener());
userNumeratorInput.getDocument().addDocumentListener(new MyDocumentListener());
userNumeratorInput.getDocument().putProperty("name", "Text Field");
/*
userNumeratorInput.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
userNumeratorInputKeyReleased(evt);
}
});
*/
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jSeparator1 = new javax.swing.JSeparator();
userDenominatorInput = new javax.swing.JTextField();
jSeparator2 = new javax.swing.JSeparator();
numeratorOutput = new javax.swing.JTextField();
denominatorOutput = new javax.swing.JTextField();
jLabel3 = new javax.swing.JLabel();
userNumeratorInput = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("Reduce Fractions");
jLabel2.setText("This program will reduce a fraction to its lowest terms");
userDenominatorInput.setFont(new java.awt.Font("Gabriola", 1, 24)); // NOI18N
userDenominatorInput.setForeground(new java.awt.Color(255, 102, 51));
numeratorOutput.setEditable(false);
numeratorOutput.setColumns(10);
numeratorOutput.setFont(new java.awt.Font("Gabriola", 1, 24)); // NOI18N
numeratorOutput.setForeground(new java.awt.Color(255, 102, 51));
denominatorOutput.setEditable(false);
denominatorOutput.setColumns(10);
denominatorOutput.setFont(new java.awt.Font("Gabriola", 1, 24)); // NOI18N
denominatorOutput.setForeground(new java.awt.Color(255, 102, 51));
jLabel3.setFont(new java.awt.Font("Tempus Sans ITC", 1, 36)); // NOI18N
jLabel3.setText("=");
userNumeratorInput.setFont(new java.awt.Font("Gabriola", 1, 24)); // NOI18N
userNumeratorInput.setForeground(new java.awt.Color(255, 102, 51));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(155, 155, 155)
.addComponent(jLabel1))
.addGroup(layout.createSequentialGroup()
.addGap(75, 75, 75)
.addComponent(jLabel2)))
.addGap(0, 82, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jSeparator1)
.addComponent(userDenominatorInput, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 166, Short.MAX_VALUE)
.addComponent(userNumeratorInput))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel3)
.addGap(29, 29, 29)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jSeparator2)
.addComponent(denominatorOutput, javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(numeratorOutput, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 31, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(layout.createSequentialGroup()
.addComponent(userNumeratorInput, javax.swing.GroupLayout.PREFERRED_SIZE, 0, Short.MAX_VALUE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 2, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(userDenominatorInput, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jSeparator2, javax.swing.GroupLayout.PREFERRED_SIZE, 2, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3, javax.swing.GroupLayout.PREFERRED_SIZE, 14, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(denominatorOutput, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addComponent(numeratorOutput, javax.swing.GroupLayout.PREFERRED_SIZE, 35, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(50, 50, 50)))
.addGap(22, 22, 22))
);
pack();
}// </editor-fold>
/* public void userDenominatorInputKeyReleased(java.awt.event.KeyEvent evt) {
double userDenominator = Double.parseDouble(userDenominatorInput.getText());
double userNumerator = Double.parseDouble(userNumeratorInput.getText());
calculate(userNumerator, userDenominator);
}
*/
/* public void userNumeratorInputKeyReleased(java.awt.event.KeyEvent evt) {
double userDenominator = Double.parseDouble(userDenominatorInput.getText());
double userNumerator = Double.parseDouble(userNumeratorInput.getText());
calculate(userNumerator, userDenominator);
}
*/
public void update() {
if (!userDenominatorInput.getText().isEmpty() && !userNumeratorInput.getText().isEmpty()) {
double userDenominator = Double.parseDouble(userDenominatorInput.getText());
double userNumerator = Double.parseDouble(userNumeratorInput.getText());
calculate(userNumerator, userDenominator);
}
}
public void calculate(double userNumerator, double userDenominator) {
if (Double.toString(userNumerator).contains(".")) {
int decimalLocationuserNumerator = Double.toString(userNumerator).lastIndexOf(".");
String decimalsuserNumerator = Double.toString(userNumerator).substring(decimalLocationuserNumerator + 1, Double.toString(userNumerator).length());
int magnitudeUserNumerator = decimalsuserNumerator.length();
userNumerator = userNumerator * Math.pow(10, magnitudeUserNumerator);
userDenominator = userDenominator * Math.pow(10, magnitudeUserNumerator);
}
if (Double.toString(userDenominator).contains(".")) {
int decimalLocationUserDenominator = Double.toString(userDenominator).lastIndexOf(".");
String decimalsUserDenominator = Double.toString(userDenominator).substring(decimalLocationUserDenominator + 1, Double.toString(userDenominator).length());
int magnitudeUserDenominator = decimalsUserDenominator.length();
userDenominator = userDenominator * Math.pow(10, magnitudeUserDenominator);
userNumerator = userNumerator * Math.pow(10, magnitudeUserDenominator);
}
double a = userNumerator;
double b = userDenominator;
double c = a % b;
while (c > 1) {
c = a % b;
a = b;
b = c;
}
int greatestCommonDenominator = (int) a;
int numeratorAnswer = (int) userNumerator / greatestCommonDenominator;
int denominatorAnswer = (int) userDenominator / greatestCommonDenominator;
numeratorOutput.setText(Integer.toString(numeratorAnswer));
denominatorOutput.setText(Integer.toString(denominatorAnswer));
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextField denominatorOutput;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JSeparator jSeparator1;
private javax.swing.JSeparator jSeparator2;
private javax.swing.JTextField numeratorOutput;
public javax.swing.JTextField userDenominatorInput;
private javax.swing.JTextField userNumeratorInput;
// End of variables declaration
private class MyDocumentListener implements DocumentListener {
public MyDocumentListener() {
}
#Override
public void insertUpdate(DocumentEvent de) {
update();
}
#Override
public void removeUpdate(DocumentEvent de) {
update();
}
#Override
public void changedUpdate(DocumentEvent de) {
update();
}
}
}

How do I Calculate the Average using the CalculateButton with following code for a KDRCalculator Program

In the following code I don't know how to find the average using the Calculate Button. I have managed to read the text in through Text fields for the values but i don't know how to make the program calculate the average and print it in the textfield once the Calculate Button has been clicked.
import java.util.Scanner;
public class KdrCalGui extends javax.swing.JFrame {
/**
* Creates new form KdrCalGui
*/
public KdrCalGui() {
initComponents();
double kills;
double deaths;
double subtotal;
double roundnumber;
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
KillsValue = new javax.swing.JTextField();
KillsLabel = new javax.swing.JLabel();
DeathsValue = new javax.swing.JLabel();
DeathsLabel = new javax.swing.JTextField();
CalculateButton = new javax.swing.JButton();
jLabel3 = new javax.swing.JLabel();
Display = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
KillsValue.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
KillsValueActionPerformed(evt);
}
});
KillsLabel.setText("Kills");
DeathsValue.setText("Deaths");
DeathsLabel.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
DeathsLabelActionPerformed(evt);
}
});
CalculateButton.setText("Calculate");
CalculateButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
CalculateButtonActionPerformed(evt);
}
});
jLabel3.setText("Your KDR");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(39, 39, 39)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
.addComponent(CalculateButton, javax.swing.GroupLayout.PREFERRED_SIZE, 86, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(DeathsLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 66, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(DeathsValue)
.addComponent(KillsValue, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(KillsLabel))
.addGap(113, 113, 113)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.CENTER)
.addComponent(Display, javax.swing.GroupLayout.PREFERRED_SIZE, 91, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel3))
.addContainerGap(31, Short.MAX_VALUE))
);
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {DeathsLabel, KillsValue});
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(18, 18, 18)
.addComponent(KillsLabel)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(KillsValue, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(DeathsValue)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(DeathsLabel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(25, 25, 25)
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(Display)))
.addGap(36, 36, 36)
.addComponent(CalculateButton, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(50, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void DeathsLabelActionPerformed(java.awt.event.ActionEvent evt) {
DeathsLabel.setText(DeathsLabel.getText());
double deaths;
Scanner sc= new Scanner(System.in);
deaths=sc.nextInt();
}
private void KillsValueActionPerformed(java.awt.event.ActionEvent evt) {
KillsLabel.setText(KillsLabel.getText());
double kills;
Scanner sc=new Scanner(System.in);
kills=sc.nextInt();
}
THIS IS THE CALCULATE BUTTON.
private void CalculateButtonActionPerformed(java.awt.event.ActionEvent evt) {
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(KdrCalGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(KdrCalGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(KdrCalGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(KdrCalGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new KdrCalGui().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton CalculateButton;
private javax.swing.JTextField DeathsLabel;
private javax.swing.JLabel DeathsValue;
private javax.swing.JTextField Display;
private javax.swing.JLabel KillsLabel;
private javax.swing.JTextField KillsValue;
private javax.swing.JLabel jLabel3;
// End of variables declaration
}

CalculateButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
if (evt.getSource() == CalculateButton) {
// not sure what exactly you're trying to average
// but if it's the kills and deaths value, then...
int k = Integer.parseInt(KillsValue.getText());
int d = Integer.parseInt(DeathsValue.getText());
Display.setText((k+d)/2);
// think about adding exception handling in case they enter a noninteger
// also you switched the names of the TextField and Label in the initComponents()
}
}
});

how to get the text from a text field to a variable?

i want to get the value from the txt field val1 and val2 and store it in the variables n1 and n2. then n1 and n2 will be parsed to get the value for the calculator. here is the code:
public class CalcUI extends javax.swing.JFrame {
String n1 = val1.getText();
String n2 = val2.getText();
double num1 = Double.parseDouble(n1);
double num2 = Double.parseDouble(n2);
/**
* Creates new form CalcUI
*/
public CalcUI() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
#SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
val1 = new javax.swing.JTextField();
val2 = new javax.swing.JTextField();
plus = new javax.swing.JButton();
multiply = new javax.swing.JButton();
clr = new javax.swing.JButton();
exit = new javax.swing.JButton();
minus = new javax.swing.JButton();
divide = new javax.swing.JButton();
ans = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
plus.setText("+");
plus.setMaximumSize(new java.awt.Dimension(41, 41));
plus.setMinimumSize(new java.awt.Dimension(41, 41));
plus.setPreferredSize(new java.awt.Dimension(41, 41));
plus.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
plusActionPerformed(evt);
}
});
multiply.setText("*");
multiply.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
multiplyActionPerformed(evt);
}
});
clr.setText("Clear");
clr.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
clrActionPerformed(evt);
}
});
exit.setText("Exit");
exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
exitActionPerformed(evt);
}
});
minus.setText("-");
minus.setMaximumSize(new java.awt.Dimension(41, 41));
minus.setMinimumSize(new java.awt.Dimension(41, 41));
minus.setPreferredSize(new java.awt.Dimension(41, 41));
minus.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
minusActionPerformed(evt);
}
});
divide.setText("/");
divide.setMaximumSize(new java.awt.Dimension(41, 41));
divide.setMinimumSize(new java.awt.Dimension(41, 41));
divide.setPreferredSize(new java.awt.Dimension(41, 41));
divide.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
divideActionPerformed(evt);
}
});
ans.setBorder(javax.swing.BorderFactory.createEtchedBorder());
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(val1)
.addComponent(val2)
.addGroup(layout.createSequentialGroup()
.addComponent(clr)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(exit)))
.addContainerGap())
.addGroup(layout.createSequentialGroup()
.addGap(134, 134, 134)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(multiply, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(plus, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(77, 77, 77)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(minus, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(divide, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(143, 143, 143))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(ans, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(46, 46, 46)
.addComponent(val1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(val2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(ans, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(plus, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(minus, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(34, 34, 34)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(multiply, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(divide, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 31, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(clr)
.addComponent(exit))
.addContainerGap())
);
pack();
}// </editor-fold>
private void plusActionPerformed(java.awt.event.ActionEvent evt) {
double add = num1 + num2;
ans.setText(Double.toString(add));
// TODO add your handling code here:
}
private void minusActionPerformed(java.awt.event.ActionEvent evt) {
double min = num1 - num2;
ans.setText(Double.toString(min));
// TODO add your handling code here:
}
private void divideActionPerformed(java.awt.event.ActionEvent evt) {
double div = num1 / num2;
ans.setText(Double.toString(div));
// TODO add your handling code here:
}
private void exitActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
// TODO add your handling code here:
}
private void clrActionPerformed(java.awt.event.ActionEvent evt) {
val1.setText("");
val2.setText("");
ans.setText("");
// TODO add your handling code here:
}
private void multiplyActionPerformed(java.awt.event.ActionEvent evt) {
double mult = num1 * num2;
ans.setText(Double.toString(mult));
// TODO add your handling code here:
}
/**
* #param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(CalcUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(CalcUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(CalcUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(CalcUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new CalcUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel ans;
private javax.swing.JButton clr;
private javax.swing.JButton divide;
private javax.swing.JButton exit;
private javax.swing.JButton minus;
private javax.swing.JButton multiply;
private javax.swing.JButton plus;
private javax.swing.JTextField val1;
private javax.swing.JTextField val2;
// End of variables declaration
}
the problem is that in the declaration
String n1 = val1.getText();
String n2 = val2.getText();
i get an error whioch says illegal forward reference. how do i fix this?
this was fixed.
now when i use the following code:
public class CalcUI extends javax.swing.JFrame {
Double num1 ;
Double num2 ;
/**
* Creates new form CalcUI
*/
public CalcUI(){
val1 = new javax.swing.JTextField();
val2 = new javax.swing.JTextField();
num1 = Double.parseDouble(val1.getText());
num2 = Double.parseDouble(val2.getText());
initComponents();
}
i get a build error which says:
Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1011)
at java.lang.Double.parseDouble(Double.java:540)
at CalcUI.<init>(CalcUI.java:24)
at CalcUI$7.run(CalcUI.java:227)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:701)
at java.awt.EventQueue.access$000(EventQueue.java:102)
at java.awt.EventQueue$3.run(EventQueue.java:662)
at java.awt.EventQueue$3.run(EventQueue.java:660)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:671)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)
how do i fix this? what is wrong with the code?

I imagine your JTextField components will not have been initialised by the time you are calling:
String n1 = val1.getText();
String n2 = val2.getText();

If you use this code you will see what your input is.
private void yourActionButtonActionPerformed(java.awt.event.ActionEvent evt) {
JOptionPane.showMessageDialog(null,yourTextField.getText());
}
So, this should store your data to n1.
private void yourActionButtonActionPerformed(java.awt.event.ActionEvent evt) {
String n1;
n1 = yourTextField.getText();
}

You're missing the "equals" button that will do the computation. Add a listener to that button, and in the listener's actionPerformed() you getText() and then compute the calculation. Also, I guess there's no need to have n1 and n2 as class-level variables.