I am a beginner in Java GUI. I was trying to create a simple login form in Netbeans. It consists of JFrame called TestSuiteFrame and a JPanel called TestSuiteEntryPanel containing a couple of labels, textboxes and a button. I have not yet added the "business logic".
The problem is that when I run the project, nothing happens. After a few seconds I get this as output:
run:
Java Result: -1073740771
BUILD SUCCESSFUL (total time: 15 seconds)
And that's it. No window appears. What exactly am I doing wrong?
Here is the code:
package TPackage;
public class TestSuiteFrame extends javax.swing.JFrame {
/**
* Creates new form TestSuiteFrame
*/
public TestSuiteFrame() {
initComponents();
TestSuiteEntryPanel a = new TestSuiteEntryPanel();
add(a);
}
/**
* 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() {
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 300, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
/**
* #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(TestSuiteFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(TestSuiteFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(TestSuiteFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TestSuiteFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//System.out.println("abc");
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
TestSuiteFrame b = new TestSuiteFrame();
b.setTitle("Login");
b.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//b.pack();
b.setVisible(true);
}
});
}
// Variables declaration - do not modify
// End of variables declaration
}
The Panel code:
package TPackage;
public class TestSuiteEntryPanel extends javax.swing.JPanel {
/**
* Creates new form TestSuiteEntryPanel
*/
public TestSuiteEntryPanel() {
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() {
labelEntryName = new javax.swing.JLabel();
labelEntryPassword = new javax.swing.JLabel();
ButtonEntryLogin = new javax.swing.JButton();
TextEntryName = new javax.swing.JTextField();
TextEntryPassword = new javax.swing.JPasswordField();
setPreferredSize(new java.awt.Dimension(350, 325));
labelEntryName.setText("Name:");
labelEntryPassword.setText("Password:");
ButtonEntryLogin.setText("Login");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(37, 37, 37)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(labelEntryPassword)
.addComponent(labelEntryName))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(TextEntryName, javax.swing.GroupLayout.DEFAULT_SIZE, 221, Short.MAX_VALUE)
.addComponent(TextEntryPassword))
.addContainerGap(24, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(ButtonEntryLogin)
.addGap(45, 45, 45))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(44, 44, 44)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(labelEntryName)
.addComponent(TextEntryName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(labelEntryPassword)
.addComponent(TextEntryPassword, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addComponent(ButtonEntryLogin)
.addContainerGap(182, Short.MAX_VALUE))
);
}// </editor-fold>
// Variables declaration - do not modify
private javax.swing.JButton ButtonEntryLogin;
private javax.swing.JTextField TextEntryName;
private javax.swing.JPasswordField TextEntryPassword;
private javax.swing.JLabel labelEntryName;
private javax.swing.JLabel labelEntryPassword;
// End of variables declaration
}
You need to invoke pack(); after all components are added to the frame.
So uncommend the pack(); call above setVilisble(true); and remove the one in the constructor :- )
I Hope that helped.
Remove whole initComponents method from TestSuiteFrame class (you don't even need it) and uncomment pack within main method. It was a problem with GroupLayout.
Your code should look like this:
import javax.swing.*;
public class TestSuiteFrame extends javax.swing.JFrame {
public TestSuiteFrame() {
TestSuiteEntryPanel a = new TestSuiteEntryPanel();
add(a);
}
public static void main(String args[]) {
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(TestSuiteFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(TestSuiteFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(TestSuiteFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(TestSuiteFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
TestSuiteFrame b = new TestSuiteFrame();
b.setTitle("Login");
b.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
b.pack();
b.setVisible(true);
}
});
}
}
Also, keep in mind that pack comes after you add components on JFrame. Learn how to write Java Swing code by hand and avoid use of that horrible Matisse GUI builder.
Make sure you import the necessary packages (even though you probably already imported)
import java.awt.*;
import javax.swing.*;
Run your program. If nothing shows up and if you are using Windows, Press alt - tab to cycle through your opened applications.
Alternatively, after executing your program. Press ctrl + alt + del and check under the Applications tab of Windows Task Manager and see whether there exist a task by the name of Login (your java app).
I tried your codes, it does shows up a window. That JFrame from your program might be hidden by your other applications.
If you are using IDE like Netbeans, make sure the main program file is pointing to the main() within TestSuiteFrame.
If still nothing shows up, try running individual file instead of the entire project. shift + F5 or right-click TestSuiteFrame.java => run file for Netbeans.
On top of everything, make sure you are running the correct file. You can simply write some System.out.println() statements within you main(). Just check whether the console print those line when you run your program. There are many ways to check.
If the console doesn't print those println statements, then BINGO! You are probably not running the correct java file/project.
Related
I have an InputVerifier on a JFormattedTextField. It is called when field looses focus perfectly. I added a cancel button (JButton), but do not want to call then InputVerifier when this button is clicked.
MyVerifier is called when the focus is lost on the field without any problem. However, after I click the clearButton the InputVerifier won´t be called again, as if the button where clicked even if it´s not.
The complete code is:
public class DemoFrame extends javax.swing.JFrame {
/** Creates new form DemoFrame */
public DemoFrame() {
initComponents();
name.setValue("");
name.setInputVerifier(new MyVerifier());
clear.setVerifyInputWhenFocusTarget(false);
}
private class MyVerifier extends javax.swing.InputVerifier {
public boolean verify(javax.swing.JComponent input) {
System.out.println("Field is being verified");
return true;
}
public boolean shouldYieldFocus(javax.swing.JComponent input) {
return verify(input);
}
}
/** 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() {
name = new javax.swing.JFormattedTextField();
clear = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
name.setText(" ");
clear.setText("clear");
clear.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
clearActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(231, Short.MAX_VALUE)
.addComponent(clear)
.addGap(112, 112, 112))
.addGroup(layout.createSequentialGroup()
.addGap(116, 116, 116)
.addComponent(name, javax.swing.GroupLayout.PREFERRED_SIZE, 128, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(156, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(94, 94, 94)
.addComponent(name, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 90, Short.MAX_VALUE)
.addComponent(clear)
.addGap(73, 73, 73))
);
pack();
}// </editor-fold>
private void clearActionPerformed(java.awt.event.ActionEvent evt) {
name.setValue(null);
}
/**
* #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(DemoFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(DemoFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(DemoFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(DemoFrame.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 DemoFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton clear;
private javax.swing.JFormattedTextField name;
// End of variables declaration
}
Why isn't the InputVerifier been invoked if the field looses focus without the button being clicked?
Well. I found the solution.
clear.setFocusable(false);
That solves the problem.
I would like to implement a "Find Menu" in my simple notepad application in java but when I find a certain word,It just jumps up to the second similar word in the JTextArea, can anyone point out where I am wrong and how to furnish it? and I dont want to use Highlighter, just the select() method .. I would appreciate any help you can do. Im just new to programming.
/**
*
* #author aLwAyz
*/
public class FindDemo extends javax.swing.JDialog {
/**
* Creates new form FindDemo
*/
public FindDemo(java.awt.Frame parent, boolean modal) {
super(parent, modal);
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() {
dlgFind = new javax.swing.JDialog();
btnFind = new javax.swing.JButton();
txtInput = new javax.swing.JTextField();
jScrollPane1 = new javax.swing.JScrollPane();
txaField = new javax.swing.JTextArea();
btnOpenFindDialog = new javax.swing.JButton();
dlgFind.setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
btnFind.setText("Find");
btnFind.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnFindActionPerformed(evt);
}
});
txtInput.setMinimumSize(new java.awt.Dimension(400, 100));
javax.swing.GroupLayout dlgFindLayout = new javax.swing.GroupLayout(dlgFind.getContentPane());
dlgFind.getContentPane().setLayout(dlgFindLayout);
dlgFindLayout.setHorizontalGroup(
dlgFindLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, dlgFindLayout.createSequentialGroup()
.addContainerGap(77, Short.MAX_VALUE)
.addComponent(txtInput, javax.swing.GroupLayout.PREFERRED_SIZE, 111, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(63, 63, 63)
.addComponent(btnFind)
.addGap(96, 96, 96))
);
dlgFindLayout.setVerticalGroup(
dlgFindLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(dlgFindLayout.createSequentialGroup()
.addGap(27, 27, 27)
.addGroup(dlgFindLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(btnFind)
.addComponent(txtInput, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(28, Short.MAX_VALUE))
);
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
setModalExclusionType(null);
setModalityType(null);
txaField.setColumns(20);
txaField.setRows(5);
jScrollPane1.setViewportView(txaField);
btnOpenFindDialog.setText("Find");
btnOpenFindDialog.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
btnOpenFindDialogActionPerformed(evt);
}
});
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()
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(btnOpenFindDialog)
.addGap(72, 72, 72))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(22, 22, 22)
.addComponent(btnOpenFindDialog)
.addGap(35, 35, 35)
.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 209, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
private void btnOpenFindDialogActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
dlgFind.pack();
dlgFind.setLocationRelativeTo(null);
dlgFind.show();
}
private void btnFindActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String text = txtInput.getText();
String txa = txaField.getText();
int length = text.length();
String selected = txaField.getSelectedText();
int selIn = 0;
if (txaField.getSelectedText() != null) selIn = txa.indexOf(selected);
int inSelected = selIn + length;
if (txaField.getSelectedText() == null) inSelected = 0;
int index = txa.indexOf(text, inSelected);
if (txa.contains(text)) {
txaField.select(index, index + length);
}
}
/**
* #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(FindDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(FindDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(FindDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(FindDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the dialog */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
FindDemo dialog = new FindDemo(new javax.swing.JFrame(), true);
dialog.addWindowListener(new java.awt.event.WindowAdapter() {
#Override
public void windowClosing(java.awt.event.WindowEvent e) {
System.exit(0);
}
});
dialog.setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton btnFind;
private javax.swing.JButton btnOpenFindDialog;
private javax.swing.JDialog dlgFind;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea txaField;
private javax.swing.JTextField txtInput;
// End of variables declaration
}
That is my code. Im sorry if there are many redundancies because like I've said, im just new to programming. Thank You.
-By the way, I am using NetBeans IDE 8.0
-Sorry if it took me time
when I find a certain word,It just jumps up to the second similar word in the JTextArea,
When I try the code, the first time you press "Find" it selects the first occurrence of the word. Then if you press Find again it selects the second occurrence of the word. If you press "Find" again it stays on the second occurrence of the word.
So as I suggested in my comment you need to get rid of your "selection logic" and get the basic search working properly first.
Normally when you do a search you start the search from the caret position. This will allow you to continually press the "Find" button to move on to the next occurrence of the word. This works because when you "select" the found word, the caret is moved to the end of the word, so when you press "Find" the next time the caret postion is set at the end of the word, ready to search for the next word.
Followed an oracle tutorial on creating a GUI, the tutorial promised that upon running the application I will have to select the main class, however, Netbeans doesn't find any Main classes?
Here is my code:
public class GUI extends javax.swing.JFrame {
/**
* Creates new form GUI
*/
public GUI() {
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() {
jTextField1 = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Bookshop");
jTextField1.setText("Enter Title");
jTextField1.setName(""); // NOI18N
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
jLabel1.setText("Book Title");
jButton1.setText("Submit");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
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(jButton1)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addComponent(jLabel1)
.addContainerGap(244, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 18, Short.MAX_VALUE)
.addComponent(jButton1)
.addGap(228, 228, 228))
);
pack();
}// </editor-fold>
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
//Parse degrees Celsius as a double and convert to Fahrenheit.
String Title = (String)(jTextField1.getText());
jLabel1.setText("Selected Title:" + Title);
}
/**
* #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(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(GUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(GUI.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 GUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
I thought that "public static void main(String args[]) {" declared a main class. The class GUI.java is in the source package so I really don't understand.
Please note I'm very new to Java, and really appreciate your time.
Your understanding is correct, and I can't see anything obviously wrong with your main class.
Although having said that:
public static void main(String args[]) {
should be:
public static void main(String[] args) {
If you right click on the Java file in your project window and select "run this file" or "debug this file" that will tell netbeans to execute that file ignoring the project settings.
If that works then go in the properties of your project and set the main class in there for future use.
Your best bet to track this down will be divide an conquer. Create a new file, create an empty main()method in it that just prints "hello world", then transfer your code across a section at a time until you find the thing that breaks it.
Right click on your Project in the project explorer
Click on properties
Click on Run
Make sure your Main Class is the one you want to be the entry point. (Make sure to use the fully qualified name i.e. mypackage.MyClass)
Click OK.
Right-click on your project; click 'Clean and Build`
Run Project
If you just want to run the file, right click on the class from the package explorer, and click Run File, or (Alt + R, F), or (Shift + F6)
The mistake I've made before is when I create a new Project, I forget to unclick the "Create Main Class` check box and so it create a Class for me, which I don't like so I delete the class. In this case, I would have to do the above steps to fix the problem so it will run correctly. The Main class NetBeans creates for you, is the launching class. If you delete it, you need to manually specify the new launching class for the project, then clean and build.
I know the output can be saved into a file but I was wondering if the output results from Netbeans can be displayed in a form, inside a textbox or something.
Is it possible?
Thanks,
Chiapa
This is a very simplified example, but yes. It is possible to have your results be displayed in a form.
What you need to do is create a new form (I used a JFrame Form).
From there, I added in a JTextPane to the form.
That should be all that you need on your form, just to display results.
After that, you will just need to set the textPane's text to your results and run the program.
This is what my code looks like.
public class ResultsForm extends javax.swing.JFrame {
/**
* Creates new form ResultsForm
*/
public ResultsForm() {
initComponents();
this.TextArea.setText("No input");
this.TextArea.setEditable(false);
}
//This is the constructor that takes in your results and places is
//in the form
public ResultsForm(String results){
initComponents();
this.TextArea.setText(results);
this.TextArea.setEditable(false);
}
/**
* 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() {
jScrollPane2 = new javax.swing.JScrollPane();
TextArea = new javax.swing.JTextPane();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jScrollPane2.setViewportView(TextArea);
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(64, 64, 64)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 292, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(64, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(60, 60, 60)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 142, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(98, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
/**
* #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(ResultsForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ResultsForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ResultsForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ResultsForm.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() {
//This is where you should place your running code
String dataToOutput = "This should be on the form";
//This is where you pass in the results to the form
new ResultsForm(dataToOutput).setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JTextPane TextArea;
private javax.swing.JScrollPane jScrollPane2;
// End of variables declaration
}
Also, here is a link to a very basic tutorial for creating forms within Netbeans:
Form Creation Tutorial
I have a jTextField, and when I want to type something in it, I want it to be displayed.
I used the jTextField1KeyTyped event.
but the problem is when I press some text the console shows me the text from the jTextField minus the last char.
for example if I typed "abcde", it will show me only "abcd".
how can I resolve this issue.
EDIT :
this is my project :
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package Personel;
/**
*
* #author aimad
*/
public class SelectionArticle extends javax.swing.JFrame {
/**
* Creates new form SelectionProduit
*/
public SelectionArticle() {
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() {
jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setResizable(false);
jLabel1.setText("jLabel1");
jTextField1.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent evt) {
jTextField1KeyTyped(evt);
}
public void keyPressed(java.awt.event.KeyEvent evt) {
jTextField1KeyPressed(evt);
}
});
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()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 264, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jTextField1KeyTyped(java.awt.event.KeyEvent evt) {
System.out.println("Key typed : " + jTextField1.getText());
}
/**
* #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(SelectionArticle.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(SelectionArticle.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(SelectionArticle.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(SelectionArticle.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 SelectionArticle().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
add DocumentListener instead of KeyListener to JTextComponent
then you can to listening for string inserted, removed or replaced whole String in JTextComponent, otherwise all mentioned events aren't possible to catch by KeyListener