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Show next question when next button is clicked

I trying to read file in java. When click next button, how can I show second question when next button is clicked?
My .txt file content is like this
1. What is his name
A.John
B.David
2. How old is him?
A.24
B.27
So far I am able to display the first question in JTextField.
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.io.File;
import java.io.FileReader;
public class NewJFrame extends javax.swing.JFrame {
/**
* Creates new form NewJFrame
*/
public NewJFrame() throws IOException {
initComponents();
setLocationRelativeTo(null);
pack();
File file = new File("/home/xxx/Desktop/englishQuestion.txt");
StringBuilder sb = new StringBuilder();
try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
String line;
while ((line = reader.readLine()) != null) {
sb.append(line).append("\n");
if (line.equals("")) {
break;
}
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
String result = sb.toString();
jTextArea1.setText(result);
}
/**
* 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() {
jButton1 = new javax.swing.JButton();
textField1 = new java.awt.TextField();
label1 = new java.awt.Label();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Next");
textField1.setName("\"\""); // NOI18N
textField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
textField1ActionPerformed(evt);
}
});
label1.setText("Answer:");
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
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()
.addGap(0, 0, Short.MAX_VALUE)
.addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(textField1, javax.swing.GroupLayout.PREFERRED_SIZE, 53, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 57, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(28, 28, 28))
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 421, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 206, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(textField1, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton1))
.addContainerGap())
);
label1.getAccessibleContext().setAccessibleName("Answer: ");
pack();
}// </editor-fold>
private void textField1ActionPerformed(java.awt.event.ActionEvent evt) {
// 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(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() {
try {
new NewJFrame().setVisible(true);
} catch (IOException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
private java.awt.Label label1;
private java.awt.TextField textField1;
// End of variables declaration
}

I refactored the file lines to be like this:
q1 = What is his name? | John | David
q2 = How old is him? | 24 | 27
This way, each question information is in a single line and is easier to parse. You just have to load it as a property file and the q1 and q2 would be the keys, and what is after = would be the values. After that, split it by | or whatever you decide to use.
I refactored your code to look like this:
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
public class NewJFrame extends javax.swing.JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private Properties props = new Properties();
private List<Question> questionList = new ArrayList<>();
private int currentQuestionIndex = -1;
private class Question {
private String question;
private String answer1;
private String answer2;
#Override
public String toString() {
return "Question [question=" + question + ", answer1=" + answer1 + ", answer2=" + answer2 + "]";
}
public Question(String question, String answer1, String answer2) {
this.question = question;
this.answer1 = answer1;
this.answer2 = answer2;
}
public String getQuestion() {
return question;
}
public String getAnswer1() {
return answer1;
}
public String getAnswer2() {
return answer2;
}
}
public void showNextQuestion() {
currentQuestionIndex++;
if (currentQuestionIndex >= questionList.size()) {
jTextArea1.setText("No more questions available.");
return;
}
jTextArea1.setText("");
Question currentQuestion = questionList.get(currentQuestionIndex);
String newLine = "\n";
jTextArea1.append(currentQuestion.getQuestion() + newLine);
jTextArea1.append("A. " + currentQuestion.getAnswer1() + newLine);
jTextArea1.append("B. " + currentQuestion.getAnswer2());
}
public NewJFrame() throws IOException {
initComponents();
setLocationRelativeTo(null);
pack();
Path path = Paths.get("/home/xxx/Desktop/englishQuestion.txt");
props.load(Files.newInputStream(path));
props.forEach((key, value) -> {
String v = (String) value;
System.out.println(v);
String[] token = v.split("\\|");
String question = token[0];
String answer1 = token[1];
String answer2 = token[2];
Question q = new Question(question, answer1, answer2);
questionList.add(q);
});
showNextQuestion();
}
/**
* 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() {
jButton1 = new javax.swing.JButton();
textField1 = new java.awt.TextField();
label1 = new java.awt.Label();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Next");
jButton1.addActionListener(e -> {
showNextQuestion();
});
textField1.setName("\"\""); // NOI18N
textField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
textField1ActionPerformed(evt);
}
});
label1.setText("Answer:");
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
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().addGap(0, 0, Short.MAX_VALUE)
.addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(textField1, javax.swing.GroupLayout.PREFERRED_SIZE, 53,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 57,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(28, 28, 28))
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 421,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)));
layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
layout.createSequentialGroup().addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 206,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(label1, javax.swing.GroupLayout.PREFERRED_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(textField1, javax.swing.GroupLayout.PREFERRED_SIZE, 30,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton1))
.addContainerGap()));
label1.getAccessibleContext().setAccessibleName("Answer: ");
pack();
}// </editor-fold>
private void textField1ActionPerformed(java.awt.event.ActionEvent evt) {
// 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(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() {
try {
new NewJFrame().setVisible(true);
} catch (IOException ex) {
Logger.getLogger(NewJFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
private java.awt.Label label1;
private java.awt.TextField textField1;
// End of variables declaration
}
Notice that I used a Properties object to load all the keys, and then for each of those lines, I parsed it and created a Question object and add it to a questionList. Also, notice the jButton1.addActionListener(e -> { showNextQuestion(); });. Call showNextQuestion(); method everytime you want the next question, in this case, every time to click the Next button.
I'm not sure what you want to acomplish with this application, is not clear yet, but I simply answered your question on how to show the next question.

First of all, your questions in the file should be in uniform format, I mean we should be able to distinguish between different question and it's options.
Secondly, then you read each question and it's options and store it in an Java Object. Let's say Question object.
Question object might be something like below:-
class Question {
String questionString;
String[] options;
}
Then, after you read each question/options and form an Object, you store these objects in a DoublyLinkedList, so you can easily navigate back and forth when user clicks Previous button or Next button.

How to fix java.lang.StackoverflowError

I'm not sure what the problem with this code is but whenever I run it I get a java.lang.StackOverflowError. How would I fix it? This is what is displayed in the output console of netbeans:
run:
Exception in thread "AWT-EventQueue-0" java.lang.StackOverflowError
at sun.awt.Win32GraphicsConfig.getBounds(Native Method)
at sun.awt.Win32GraphicsConfig.getBounds(Win32GraphicsConfig.java:222) at sun.awt.Win32GraphicsConfig.getBounds(Win32GraphicsConfig.java:222)
at java.awt.Window.init(Window.java:497)
at java.awt.Window.<init>(Window.java:536)
at java.awt.Frame.<init>(Frame.java:420)
at java.awt.Frame.<init>(Frame.java:385)
at javax.swing.JFrame.<init>(JFrame.java:180)
code
import java.awt.Color;
import java.awt.Font;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.ButtonGroup;
import javax.swing.JOptionPane;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* #author Nicholas Ferretti
*/
public class Section2 extends javax.swing.JFrame {
Section2 s2Frame = new Section2();
Section3 s3Frame = new Section3();
ResultSet section2Questions;
DB connection = new DB();
/**
* Creates new form Section2Question1
*/
TimerFrame timerFrame;
int timeRemaining = 60;
int s2QuestionNumber = 1;
public Section2() {
this.timerFrame = new TimerFrame(this);
initComponents();
groupButton();
section2QuestionBox.setEditable(false);
s2QuestionNumberLabel.setText("Question "+s2QuestionNumber+":");
try {
section2Questions=connection.queryTbl("SELECT * FROM tblQuestions WHERE Section = 2");
section2Questions.next();
String firstQuestion = section2Questions.getString("Questions");
System.out.println(firstQuestion);
section2QuestionBox.setText(firstQuestion);
String firstAnswers = section2Questions.getString("AllPossibleAnswers");
Scanner scLine = new Scanner(firstAnswers).useDelimiter(",");
while(scLine.hasNext()){
String answer1 = scLine.next();
S2Answer1.setText(answer1);
System.out.println(answer1);
String answer2 = scLine.next();
S2Answer2.setText(answer2);
System.out.println(answer2);
String answer3 = scLine.next();
S2Answer3.setText(answer3);
System.out.println(answer3);
String answer4 = scLine.next();
S2Answer4.setText(answer4);
System.out.println(answer4);
}
} catch (SQLException ex) {
Logger.getLogger(Section1.class.getName()).log(Level.SEVERE, null, ex);
System.out.println("Error with SQL firstQuestion");
}
/*boolean t = timerFrame.timer(Section2Timer, timeRemaining);
if(t == false){
JOptionPane.showMessageDialog(null, "Time up for section.");
s2Frame.setVisible(false);
//s3Frame.setVisible(true);
}*/
}
private void groupButton() {
ButtonGroup buttons = new ButtonGroup();
buttons.add(S2Answer2);
buttons.add(S2Answer3);
buttons.add(S2Answer1);
buttons.add(S2Answer4);
}
private void timer() {
try {
Score time = new Score();
int timeRemaining = time.getTime();
while(timeRemaining>0){
Section2Timer.setText(timeRemaining+"");
Section2Timer.setFont(new Font("Serif", Font.BOLD, 32));
Section2Timer.setForeground(Color.RED);
Thread.sleep(1000);
timeRemaining--;
if(timeRemaining==0){
time.setTime(60);
}
time.setTime(timeRemaining);
}
} catch (InterruptedException e) {
e.printStackTrace();
// handle the exception...
// For example consider calling Thread.currentThread().interrupt(); here.
}
}
/**
* 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() {
jLabel7 = new javax.swing.JLabel();
s2QuestionNumberLabel = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jScrollPane3 = new javax.swing.JScrollPane();
section2QuestionBox = new javax.swing.JTextArea();
S2Answer1 = new javax.swing.JRadioButton();
S2Answer2 = new javax.swing.JRadioButton();
S2Answer3 = new javax.swing.JRadioButton();
S2Answer4 = new javax.swing.JRadioButton();
nextS2Question = new javax.swing.JButton();
Section2Timer = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel7.setFont(new java.awt.Font("Tahoma", 1, 36)); // NOI18N
jLabel7.setText("SECTION 2:");
s2QuestionNumberLabel.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
s2QuestionNumberLabel.setText("QUESTION 1:");
jLabel9.setText("Answers:");
section2QuestionBox.setColumns(20);
section2QuestionBox.setRows(5);
section2QuestionBox.setText("At a conference, 12 memeber shook hands with each other \nbefore & after the meeting. How many total number of\nhand shakes occurred?");
jScrollPane3.setViewportView(section2QuestionBox);
S2Answer1.setText("Monday");
S2Answer1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
S2Answer1ActionPerformed(evt);
}
});
S2Answer2.setText("Tuesday");
S2Answer2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
S2Answer2ActionPerformed(evt);
}
});
S2Answer3.setText("Wednesday");
S2Answer3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
S2Answer3ActionPerformed(evt);
}
});
S2Answer4.setText("Friday");
S2Answer4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
S2Answer4ActionPerformed(evt);
}
});
nextS2Question.setText("Next");
nextS2Question.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
nextS2QuestionActionPerformed(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()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel7, javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addGap(125, 125, 125)
.addComponent(s2QuestionNumberLabel)))
.addGap(0, 0, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addGap(217, 217, 217)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane3, javax.swing.GroupLayout.Alignment.TRAILING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel9)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(S2Answer1)
.addGap(53, 53, 53)
.addComponent(S2Answer2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 56, Short.MAX_VALUE)
.addComponent(S2Answer3)
.addGap(45, 45, 45)
.addComponent(S2Answer4))
.addComponent(nextS2Question, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))
.addGap(139, 139, 139)
.addComponent(Section2Timer, javax.swing.GroupLayout.PREFERRED_SIZE, 101, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(Section2Timer, javax.swing.GroupLayout.PREFERRED_SIZE, 54, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 74, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(0, 0, 0)
.addComponent(s2QuestionNumberLabel, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(50, 50, 50)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel9)
.addComponent(S2Answer1)
.addComponent(S2Answer2)
.addComponent(S2Answer3)
.addComponent(S2Answer4))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 140, Short.MAX_VALUE)
.addComponent(nextS2Question)
.addGap(125, 125, 125))
);
pack();
}// </editor-fold>
String answer = "";
private void S2Answer1ActionPerformed(java.awt.event.ActionEvent evt) {
answer = S2Answer1.getText();
}
private void S2Answer2ActionPerformed(java.awt.event.ActionEvent evt) {
answer = S2Answer2.getText();
}
private void S2Answer3ActionPerformed(java.awt.event.ActionEvent evt) {
answer = S2Answer3.getText();
}
private void S2Answer4ActionPerformed(java.awt.event.ActionEvent evt) {
answer = S2Answer4.getText();
}
private void nextS2QuestionActionPerformed(java.awt.event.ActionEvent evt) {
Score score = new Score();
try {
String actualAnswer = section2Questions.getString("Answer");
int currentScore = score.getS2Score();
if(answer.equalsIgnoreCase(actualAnswer)){
currentScore+=5;
score.setS2Score(currentScore);
}
} catch (SQLException ex) {
Logger.getLogger(Section1.class.getName()).log(Level.SEVERE, null, ex);
System.out.println("Error in Next Question method");
}
if(s2QuestionNumber ==4){
int timeLeft = score.getTime();
int currentBonusPoints = score.getBonusPoints();
score.setBonusPoints(timeLeft+currentBonusPoints);
s2Frame.setVisible(false);
s3Frame.setVisible(true);
}
try {
section2Questions.next();
String nextQuestion = section2Questions.getString("Questions");
section2QuestionBox.setText(nextQuestion);
s2QuestionNumber++;
s2QuestionNumberLabel.setText("Question "+s2QuestionNumber+":");
} catch (SQLException ex) {
Logger.getLogger(Section1.class.getName()).log(Level.SEVERE, null, ex);
System.out.println("Error in Next Question method");
}
}
/**
* #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(Section2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Section2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Section2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Section2.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 Section2().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JRadioButton S2Answer1;
private javax.swing.JRadioButton S2Answer2;
private javax.swing.JRadioButton S2Answer3;
private javax.swing.JRadioButton S2Answer4;
private javax.swing.JLabel Section2Timer;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel9;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JButton nextS2Question;
private javax.swing.JLabel s2QuestionNumberLabel;
private javax.swing.JTextArea section2QuestionBox;
// End of variables declaration
}

The very first line in your class Section2 would cause the problem.
You have, Section2 s2Frame = new Section2();, which means, every time an object is created for Section2 you want to create another object of Section2 (which will create another object... and sooooooooo on...)
Hence the stackoverflow exception...

Having Trouble Serializing Data

I Am having trouble saving the state of a Form application and loading its state. I created a simple Swing Application in Java using netbeans. The purpose of the program is a spit out a unique 4 digit number and had a note if necessary. The trouble came up with I tried to serialize the data so that when the application was opened again I would be able to load the data from where I left off.
Here is the code for the Swing Portion:
import java.io.BufferedReader;
import java.util.ArrayList;
import java.util.Map;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* #author marcsantiago
*/
public class MainForm extends javax.swing.JFrame {
/**
* Creates new form MainForm
*/
public MainForm() {
//jTextField2.setVisible(false);
this.rndn = new RandomNumber();
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() {
jButton1 = new javax.swing.JButton();
jTextField1 = new javax.swing.JTextField();
jCheckBox1 = new javax.swing.JCheckBox();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jTextField3 = new javax.swing.JTextField();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Generate Number");
jButton1.setToolTipText("");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jTextField1.setToolTipText("");
jCheckBox1.setText("Add Notes");
jButton2.setText("Save Note and Number");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setText("View Notes");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jTextArea1.setEditable(false);
jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jScrollPane1.setViewportView(jTextArea1);
jButton4.setText("Save All Data");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
jButton5.setText("Load Data");
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton5ActionPerformed(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()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1)
.addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addGap(112, 112, 112)
.addComponent(jButton3)
.addGap(0, 0, Short.MAX_VALUE))))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(77, 77, 77)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 181, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 187, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, 190, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGap(113, 113, 113)
.addComponent(jCheckBox1)))
.addGap(0, 82, Short.MAX_VALUE)))
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 0, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jButton4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton5, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGap(111, 111, 111))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(22, 22, 22)
.addComponent(jButton1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jCheckBox1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton3)
.addGap(18, 18, 18)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 106, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jButton5)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
public RandomNumber rndn;
//View Randomly Generated Number buttom
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(rndn.getNumber());
}
//save number button
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
if(jCheckBox1.isSelected()){
String text = jTextField3.getText();
rndn.removeNumber(text);
}else{
rndn.removeNumber("");
}
}
//view notes
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
StringBuilder sb = new StringBuilder();
for (Map.Entry<String,String> entry : rndn.getSaveState().entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
sb.append("ID: ").append(key).append("\t");
sb.append("Note: ").append(value).append("\n");
}
jTextArea1.setText(sb.toString());
}
//save data
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
BufferedReader txtReader = rndn.getTxtReader();
ArrayList<String> numbers = rndn.getNumbers();
ArrayList<String> usedNumbers = rndn.getUsedNumbers();
String currentNumber = rndn.getCurrentNumber();
Map<String, String> saveState = rndn.getSaveState();
try
{
FileOutputStream fileOut = new FileOutputStream("/tmp/data.ser");
ObjectOutputStream out = new ObjectOutputStream(fileOut);
out.writeObject(rndn);
out.close();
fileOut.close();
}catch(IOException i)
{
i.printStackTrace();
}
}
//load data
private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
// try
// {
// FileInputStream fileIn = new FileInputStream("/tmp/data.ser");
// ObjectInputStream in = new ObjectInputStream(fileIn);
// rndn = (RandomNumber) in.readObject();
// in.close();
// fileIn.close();
// }catch(IOException i)
// {
// i.printStackTrace();
// return;
// }catch(ClassNotFoundException c)
// {
// System.out.println("Employee class not found");
// c.printStackTrace();
// return;
// }
// System.out.println(rndn.getSaveState());
}
/**
* #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(MainForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(MainForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(MainForm.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(MainForm.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 MainForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JCheckBox jCheckBox1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField3;
// End of variables declaration
}
near the end I've comment the two methods as //save and //load
That those methods I can't figure out. When I try and serialize the rndn object I get this error: java.io.NotSerializableException: java.io.BufferedReader
The class that contains the data is serrate from the Form Class:
Here is the RandomNumber class:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* #author marcsantiago
*/
public class RandomNumber implements java.io.Serializable{
private BufferedReader txtReader;
private ArrayList<String> numbers;
private ArrayList<String> usedNumbers = new ArrayList<>();
private Random rnd = new Random();
private String currentNumber;
private Map<String, String> saveState = new HashMap<>();
RandomNumber(){
this.txtReader = new BufferedReader(new InputStreamReader(RandomNumber.class.getResourceAsStream("/resources/unique_nums")));
try{
numbers = new ArrayList(Arrays.asList(txtReader.readLine().split(",")));
}catch(IOException e){
}
}
public String getNumber(){
int item = rnd.nextInt(numbers.size());
currentNumber = numbers.get(item);
while(usedNumbers.contains(currentNumber)){
item = rnd.nextInt(numbers.size());
currentNumber = numbers.get(item);
}
return currentNumber;
}
public void removeNumber(String note){
usedNumbers.add(currentNumber);
saveState.put(currentNumber, note);
numbers.remove(currentNumber);
}
public ArrayList<String> getUsedNumbers() {
return usedNumbers;
}
public String getCurrentNumber() {
return currentNumber;
}
public Map<String, String> getSaveState() {
return saveState;
}
public void setTxtReader(BufferedReader txtReader) {
this.txtReader = txtReader;
}
public BufferedReader getTxtReader() {
return txtReader;
}
public ArrayList<String> getNumbers() {
return numbers;
}
public Random getRnd() {
return rnd;
}
public void setNumbers(ArrayList<String> numbers) {
this.numbers = numbers;
}
public void setUsedNumbers(ArrayList<String> usedNumbers) {
this.usedNumbers = usedNumbers;
}
public void setRnd(Random rnd) {
this.rnd = rnd;
}
public void setCurrentNumber(String currentNumber) {
this.currentNumber = currentNumber;
}
public void setSaveState(Map<String, String> saveState) {
this.saveState = saveState;
}
}
Sorry if it's a bit messy, I haven't cleaned up the code yet because I haven't gotten it to work the way I want to to. Any help in completing this application is much appreciated.

The BufferedReader in your class is not seriablizeable and that should be causing the issue. Make it transient and it should work.

Passing a value from a JFrame to another JFrame

I have the code to do this, but I can't do it. I made something similar and worked without problem ( and asked here too) . Basically I am trying to pass the username that I enter into my textbox to a label from my otherJFrame ( I know it's not good practice to have 2 JFrames ).
The code where I try to parse my data is supposed to happen here :
if( rs.next() )
{
JOptionPane.showMessageDialog(null, "Successfully Logged In", "Success", JOptionPane.INFORMATION_MESSAGE);
this.setVisible(false);
new FrmMain2(username).setVisible(true);
}
This is the whole code from the 1'st frame
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package mysqltryouts;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
/**
*
* #author ExtremeSwat
*/
public class login_panel extends javax.swing.JFrame {
private Connection connect = null;
private Statement statement = null;
private PreparedStatement preparedStatement = null;
private ResultSet resultSet = null;
public void readDataBase() throws Exception
{
String username = jTextField1.getText();
String password = jPasswordField1.getText();
// System.out.println(username);
// System.out.println(password);
// System.out.println("test");
//---------------------
// String databaseUsername = "";
// String databasePassword = "";
try {
// this will load the MySQL driver, each DB has its own driver
Class.forName("com.mysql.jdbc.Driver");
// setup the connection with the DB.
connect = DriverManager
.getConnection("jdbc:mysql://localhost/cards?"
+ "user=root&password=password");
//String sqlQuery = "select count(*) > 0 as match_found FROM username WHERE username = ? and password = MD5(?)";
String sqlQuery = "SELECT * FROM username WHERE username = ? and password = MD5(?)";
// String sqlQuery = "select count(*) > 0 as cnt FROM username WHERE username = ? and password = MD5(?)";
PreparedStatement pst = connect.prepareStatement( sqlQuery );
pst.setString( 1, username );
pst.setString( 2, password );
ResultSet rs = pst.executeQuery();
if( rs.next() )
{
JOptionPane.showMessageDialog(null, "Successfully Logged In", "Success", JOptionPane.INFORMATION_MESSAGE);
//this.setVisible(false);
//new FrmMain().setVisible(true);
//this.setVisible(false);
//new FrmMain(username).setVisible(true);
this.setVisible(false);
new FrmMain2(username).setVisible(true);
}
else
{
JOptionPane.showMessageDialog(null, "Failed to log in", "Failure", JOptionPane.WARNING_MESSAGE);
}
} catch (Exception e) {
throw e;
} finally {
close();
}
}
private void close() {
close(resultSet);
close(statement);
close(connect);
}
private void close(AutoCloseable c) throws UnsupportedOperationException {
try {
if (c != null) {
c.close();
}
} catch (Exception e) {
// don't throw now as it might leave following closables in undefined state
}
}
/**
* Creates new form login_panel
*/
public login_panel() {
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();
jPasswordField1 = new javax.swing.JPasswordField();
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jLabel3 = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});
jPasswordField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jPasswordField1ActionPerformed(evt);
}
});
jLabel1.setText("Username");
jLabel2.setText("Password");
jButton1.setText("Login");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("eXIT");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jLabel3.setFont(new java.awt.Font("Old English Text MT", 1, 36)); // NOI18N
jLabel3.setText("Login B0$$");
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(66, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jButton2)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jLabel3)
.addGap(53, 53, 53))))
.addGroup(layout.createSequentialGroup()
.addGap(20, 20, 20)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1)
.addComponent(jLabel2))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 92, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton1))
.addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, 92, 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()
.addComponent(jLabel3)
.addGap(38, 38, 38)
.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)
.addComponent(jButton1))
.addGap(4, 4, 4)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(jPasswordField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 63, Short.MAX_VALUE)
.addComponent(jButton2))
);
pack();
}// </editor-fold>
private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jPasswordField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try{
// login_panel dao = new login_panel();
//
//
// dao.readDataBase();
this.readDataBase();
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(null, "Exit? ", "Information",dialogButton);
if(dialogResult == JOptionPane.YES_OPTION)
{
JOptionPane.showMessageDialog(null, "Thanks for the stay","Confirm",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
}else
{
JOptionPane.showMessageDialog(null, "Remaining...","Remaining....",JOptionPane.INFORMATION_MESSAGE);
}
}
/**
* #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(login_panel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(login_panel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(login_panel.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(login_panel.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 login_panel().setVisible(true);
login_panel frame = new login_panel();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPasswordField jPasswordField1;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
The code from the second form is
package mysqltryouts;
import javax.swing.*;
import java.awt.*;
//am cancer
public class FrmMain2 {
private String userName;
public FrmMain2(String username) {
this.userName=username;
gui();
}
public void gui()
{
JFrame f = new JFrame("Ma JFrame");
JPanel p = new JPanel();
p.setBackground(Color.YELLOW);
f.setSize(600,400);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton b1 = new JButton("Back");
JLabel l1 = new JLabel("Username");
l1.setText(userName);
p.add(b1);
p.add(l1);
f.add(p);
f.setVisible(true);
}
public static void main(String[] args)
{
//new FrmMain2(username);
}
}
So I want to transfer the username String to my label from MainFrame2. I had a similar problem that I posted it here ( and solved) but I can't do it.....

You state:
I know it's not good practice to have 2 JFrames
Then don't do this. The login "JFrame" should be a modal JDialog. Period. End of Story.
Why?
Then the main GUI can call the dialog knowing that code control will return right back to the spot where the dialog was made visible once the dialog is no longer visible. Then it will be trivial for the main GUI to query the state of your dialog's user provided data and move forward.
For example: https://stackoverflow.com/a/21462653/522444
Just bite the bullet and do it and you won't regret it.

Update JList Elements

I'm trying to update a JList. I have defined it to use a listModel. In that regard, it works fine because in my main() method I can add elements to the listModel and they will be reflected in the JList. However, I'm trying to force update it with new information by calling a function (below). This code does not work at all. Any help would be appreciated.
public void updateList(List<String> gamelist) {
listModel.removeAllElements();
for (int i=0;i<gamelist.size();i++) {
System.out.println(gamelist.get(i).toString());
listModel.addElement(gamelist.get(i).toString());
}
listGames.setModel(listModel);
}
public class Main extends javax.swing.JFrame {
/**
* Creates new form Main
*/
private javax.swing.JEditorPane editorWeb = new JEditorPane();
private DefaultListModel listModel = new DefaultListModel();
public Main() {
initComponents();
scrollWeb.setViewportView( editorWeb );
editorWeb.setEditable(false);
editorWeb.setSize(scrollWeb.getWidth(), scrollWeb.getHeight());
try {
editorWeb.setPage("http://www.futureretrogaming.tk/news.html");
} catch (IOException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
listModel.addElement("test");
}
I think the problem is that I"m making a new main to return the value from my other form.
public class LoginWindow extends javax.swing.JFrame {
/**
* Creates new form LoginWindow
*/
List<String> games = new ArrayList<String>();
Main program = new Main();
public LoginWindow() {
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();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
textUsername = new javax.swing.JTextField();
textPassword = new javax.swing.JPasswordField();
buttonLogin = new javax.swing.JButton();
jLabel1.setText("Please provide your username and password:");
jLabel1.setToolTipText("");
jLabel2.setText("Username:");
jLabel3.setText("Password:");
buttonLogin.setText("Submit");
buttonLogin.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
buttonLoginActionPerformed(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)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addComponent(jLabel1)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(textUsername))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(textPassword, javax.swing.GroupLayout.PREFERRED_SIZE, 159, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addComponent(buttonLogin))
.addContainerGap(84, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(textUsername, 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(jLabel3)
.addComponent(textPassword, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 18, Short.MAX_VALUE)
.addComponent(buttonLogin)
.addContainerGap())
);
pack();
}// </editor-fold>
private void buttonLoginActionPerformed(java.awt.event.ActionEvent evt) {
try {
// TODO add your handling code here:
String loginurl = "http://futureretrogaming.tk/scripts/checklogin.php?username="+textUsername.getText()+"&password="+textPassword.getText();
System.out.println(loginurl);
URL checklogin = new URL(loginurl);
URLConnection yc = checklogin.openConnection();
BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
URL file2 = new URL(loginurl);
Scanner sc2 = new Scanner(file2.openStream());
String inputLine = "";
int i = 0;
while (/*(inputLine = in.readLine()) != null*/sc2.hasNext()) {
inputLine = inputLine.trim();
String input = sc2.next();
input = input.trim();
if (inputLine.equalsIgnoreCase("false") || input.equalsIgnoreCase("false")) {
JOptionPane.showMessageDialog(this,"Username or Password is incorrect. Please try again.", "Error", JOptionPane.PLAIN_MESSAGE);
break;
}
else if (inputLine.equalsIgnoreCase("empty") || input.equalsIgnoreCase("empty")) {
JOptionPane.showMessageDialog(this,"You must type in a username and a password.", "Error",JOptionPane.PLAIN_MESSAGE);
break;
}
else {
System.out.println(input);
if (games == null)
System.out.print("games is null");
games.add(input);
}
}
in.close();
if (games!=null) {
games.remove(0);
Collections.sort(games);
program.updateList(games);
}
} catch (MalformedURLException ex) {
Logger.getLogger(LoginWindow.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(LoginWindow.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* #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(LoginWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(LoginWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(LoginWindow.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(LoginWindow.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 LoginWindow().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton buttonLogin;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JPasswordField textPassword;
private javax.swing.JTextField textUsername;
// End of variables declaration
}