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JPanel doesn't show up, i put .setVisible but.. it doesn't show up neither, It builds but it doesn't show up I'm only just a beginner in this part of programming.

 package calculatorv3; public class CalculatorForm extends javax.swing.JPanel { private static final long serialVersionUID = 1L; public CalculatorForm() { 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") private void initComponents() { jTextField2 = new javax.swing.JTextField(); jTextField3 = new javax.swing.JTextField(); jTextField4 = new javax.swing.JTextField(); jButton2 = new javax.swing.JButton(); jButton3 = new javax.swing.JButton(); jButton4 = new javax.swing.JButton(); jButton5 = new javax.swing.JButton(); jButton6 = new javax.swing.JButton(); jButton7 = new javax.swing.JButton(); jButton8 = new javax.swing.JButton(); jButton9 = new javax.swing.JButton(); jButton10 = new javax.swing.JButton(); jButton11 = new javax.swing.JButton(); jButton12 = new javax.swing.JButton(); jButton13 = new javax.swing.JButton(); jButton14 = new javax.swing.JButton(); jButton15 = new javax.swing.JButton(); jButton1 = new javax.swing.JButton(); jButton16 = new javax.swing.JButton(); jButton17 = new javax.swing.JButton(); jButton2.setText("2"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); jButton3.setText("1"); jButton3.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton3ActionPerformed(evt); } }); jButton4.setText("3"); jButton4.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton4ActionPerformed(evt); } }); jButton5.setText("4"); jButton5.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton5ActionPerformed(evt); } }); jButton6.setText("5"); jButton6.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton6ActionPerformed(evt); } }); jButton7.setText("6"); jButton7.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton7ActionPerformed(evt); } }); jButton8.setText("7"); jButton8.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton8ActionPerformed(evt); } }); jButton9.setText("8"); jButton9.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton9ActionPerformed(evt); } }); jButton10.setText("9"); jButton11.setText("0"); jButton12.setText("Add"); jButton13.setText("Sub"); jButton14.setText("Mul"); jButton15.setText("Div"); jButton1.setText("Enter"); jButton16.setText("Reset"); jButton17.setText("Equals"); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jTextField2) .addComponent(jTextField3) .addComponent(jTextField4) .addGroup(layout.createSequentialGroup() .addComponent(jButton3) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton2) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton4) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton5) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton6) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton12) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton14)) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addGroup(layout.createSequentialGroup() .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton16, javax.swing.GroupLayout.PREFERRED_SIZE, 113, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(layout.createSequentialGroup() .addComponent(jButton7) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton8) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton9) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton10) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton11))) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addComponent(jButton13) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton15) .addGap(0, 0, Short.MAX_VALUE)) .addComponent(jButton17, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .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.RELATED) .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(7, 7, 7) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton3) .addComponent(jButton2) .addComponent(jButton4) .addComponent(jButton5) .addComponent(jButton6) .addComponent(jButton12) .addComponent(jButton14)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton7) .addComponent(jButton8) .addComponent(jButton9) .addComponent(jButton10) .addComponent(jButton11) .addComponent(jButton13) .addComponent(jButton15)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jButton17, javax.swing.GroupLayout.DEFAULT_SIZE, 40, Short.MAX_VALUE) .addComponent(jButton16)) .addContainerGap()) ); }// </editor-fold> private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JButton jButton10; private javax.swing.JButton jButton11; private javax.swing.JButton jButton12; private javax.swing.JButton jButton13; private javax.swing.JButton jButton14; private javax.swing.JButton jButton15; private javax.swing.JButton jButton16; private javax.swing.JButton jButton17; private javax.swing.JButton jButton2; private javax.swing.JButton jButton3; private javax.swing.JButton jButton4; private javax.swing.JButton jButton5; private javax.swing.JButton jButton6; private javax.swing.JButton jButton7; private javax.swing.JButton jButton8; private javax.swing.JButton jButton9; private javax.swing.JTextField jTextField2; private javax.swing.JTextField jTextField3; private javax.swing.JTextField jTextField4; // End of variables declaration public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new CalculatorForm().setVisible(true); } }); } }

I can't find out what's wrong in my code, don't bother the typo errors "the numbering of the buttons" I'am only concern on how to show the Panel up

Ok I edited the code I merge it with the public static void main.. for one time init

import javax.swing.JButton; import javax.swing.JTextField;

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ /** * * @author Jfetizanan */ public class NewMain { /** * @param args the command line arguments */ public static void main(String[] args) { JTextField jTextField2 = new javax.swing.JTextField(); JTextField jTextField3 = new javax.swing.JTextField(); JTextField jTextField4 = new javax.swing.JTextField(); JButton jButton2 = new javax.swing.JButton(); JButton jButton3 = new javax.swing.JButton(); JButton jButton4 = new javax.swing.JButton(); JButton jButton5 = new javax.swing.JButton(); JButton jButton6 = new javax.swing.JButton(); JButton jButton7 = new javax.swing.JButton(); JButton jButton8 = new javax.swing.JButton(); JButton jButton9 = new javax.swing.JButton(); JButton jButton10 = new javax.swing.JButton(); JButton jButton11 = new javax.swing.JButton(); JButton jButton12 = new javax.swing.JButton(); JButton jButton13 = new javax.swing.JButton(); JButton jButton14 = new javax.swing.JButton(); JButton jButton15 = new javax.swing.JButton(); JButton jButton1 = new javax.swing.JButton(); JButton jButton16 = new javax.swing.JButton(); JButton jButton17 = new javax.swing.JButton(); jButton2.setText("2"); jButton2.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(java.awt.event.ActionEvent evt) { } }); jButton3.setText("1"); jButton3.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(java.awt.event.ActionEvent evt) { } }); jButton4.setText("3"); jButton4.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(java.awt.event.ActionEvent evt) { } }); jButton5.setText("4"); jButton5.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(java.awt.event.ActionEvent evt) { } }); jButton6.setText("5"); jButton6.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(java.awt.event.ActionEvent evt) { } }); jButton7.setText("6"); jButton7.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(java.awt.event.ActionEvent evt) { } }); jButton8.setText("7"); jButton8.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(java.awt.event.ActionEvent evt) { } }); jButton9.setText("8"); jButton9.addActionListener(new java.awt.event.ActionListener() { @Override public void actionPerformed(java.awt.event.ActionEvent evt) { } }); jButton10.setText("9"); jButton11.setText("0"); jButton12.setText("Add"); jButton13.setText("Sub"); jButton14.setText("Mul"); jButton15.setText("Div"); jButton1.setText("Enter"); jButton16.setText("Reset"); jButton17.setText("Equals"); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jTextField2) .addComponent(jTextField3) .addComponent(jTextField4) .addGroup(layout.createSequentialGroup() .addComponent(jButton3) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton2) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton4) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton5) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton6) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton12) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton14)) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addGroup(layout.createSequentialGroup() .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton16, javax.swing.GroupLayout.PREFERRED_SIZE, 113, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(layout.createSequentialGroup() .addComponent(jButton7) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton8) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton9) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton10) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jButton11))) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addComponent(jButton13) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jButton15) .addGap(0, 0, Short.MAX_VALUE)) .addComponent(jButton17, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .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.RELATED) .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(7, 7, 7) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton3) .addComponent(jButton2) .addComponent(jButton4) .addComponent(jButton5) .addComponent(jButton6) .addComponent(jButton12) .addComponent(jButton14)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton7) .addComponent(jButton8) .addComponent(jButton9) .addComponent(jButton10) .addComponent(jButton11) .addComponent(jButton13) .addComponent(jButton15)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(jButton17, javax.swing.GroupLayout.DEFAULT_SIZE, 40, Short.MAX_VALUE) .addComponent(jButton16)) .addContainerGap()) ); } }

But how about this, it shows errors

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout);

How can I add all objects to the Frame

Ok I finally finish the code.. here it is Thanks

The program itself...

Improve this question
4
  • there is no need of setVisible for JPanel, as they get visible by default when gets added to parent component Commented Aug 12, 2012 at 7:29
  • uhmm.. how to initialize "public CalculatorForm()" Commented Aug 12, 2012 at 7:34
  • What do i put here public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { } }); Commented Aug 12, 2012 at 7:34
  • As an aside. The next time you have problems with a GUI, please ask a question when you have 1 or 2 buttons, as opposed to 17 buttons, 4 text fields.. The basic principle with developing code is 'compile & run often - ask a question the first time one appears that you cannot answer from your own research'. Commented Aug 12, 2012 at 7:50

1 Answer 1

Reset to default
8

This is incorrect

public class CalculatorForm extends javax.swing.JPanel

it should be 

public class CalculatorForm extends javax.swing.JFrame

And here is a proper way How to Make Frames

UPDATE: Do as you are doing but within initComponents()

JPanel panel = new JPanel(); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(panel); panel.setLayout(layout); add(panel);

UPDATE : Here is proper way of doing

public class CalculatorForm { private static final long serialVersionUID = 1L; public CalculatorForm() { initComponents(); } private void initComponents() { JFrame frame = new JFrame(); // frame settings like size, close operation etc. JPanel panel = new JPanel(); // init textfields and buttons // add listeners or whatever javax.swing.GroupLayout layout = new javax.swing.GroupLayout(panel); panel.setLayout(layout); // layout settings goes here frame.add(panel); frame.setVisible(true); } public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new CalculatorForm(); } }); } }
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8 Comments

(or it should be added to a frame)
how to run "public CalculatorForm()" in this code public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { ------------------ } });
The first might be inadvisable (extending a component there is no need to extend), but is was not 'wrong'. The GUI could be seen by changing new CalculatorForm().setVisible(true); to JOptionPane.showMessageDialog(null, new CalculatorForm());
@AndrewThompson Sir, yes I have read in most of your comments and answers that extends JFrame or any other Component should not be done, but observing the need of the OP I posted this quick solution.
I know that is how you intended it but it brings back bad memories of school, where teachers insisted on being called 'Sir'. Those same teachers were not worthy of respect, & never earned a '+1' IMO. So just 'Andrew' will do fine, thanks Harmeet.
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