Brand new beginner help with code

**Quig** · May 27th, 2019, 05:52 PM

Hi everyone. I just starting learning how to code a few days ago. So far so good!! However I have run into one problem I cannot figure out. Maybe it’s a little to advanced for me atm. So here’s my question and hopefully I get all the terminology correct lol

I am creating a very basic windows application.
In my main window I have various buttons calling other Jframes and they work fine however in one Jframe I have a JTabbedPane.

I can’t seem to figure out how to code a jbutton to open the second tab within the Jtabbedpane in another jframe.

I’ve learned the basic jbutton to call a jframe
New jframe1().setVisible(true);

From what I’ve read online I can use JTabbedPane.setSelectedIndex(1); if the button was within the same jframe as the tabbedpane. But the button is in another jframe.

I’m sorry if this is in the wrong thread! Will repost in the right one if needed.

Thank you in advance and sorry for being so new lol

**Norm** · May 27th, 2019, 05:58 PM

But the button is in another jframe.

For code in one class to access code in another class, it must have a reference to the instance of the other class.

   TheClass refToClass = new TheClass();
    ...
   refToClass.someMethod();   // call someMethod in the other class using the reference

Without seeing the code I can not really suggest what the problem is.

Be sure to wrap your code with code tags:

[code]
**YOUR CODE GOES HERE**
[/code]

to get highlighting and preserve formatting.

**Quig** · May 27th, 2019, 08:47 PM

Norm,

I appreciate your response and willingness to help. I did a little more research on classes since your response pointed me in that direction. I don't think there is anything wrong with my code because it's basically non-exsistant for my problem lol. I quickly created a test app with the problem i'm trying to solve since my original app is on my stand-alone work computer.

Jframe 1 (main Frame) Has two buttons. The first goes to Jframe 2 (second frame) and the second button i want to go to the second tab in the second jframe. (i hope that's clear, i fear that i can't explain myself in java yet)

I'm using Netbeans IDE if that helps

Here's my code for JFrame 1

package com.shawnquigley.testproject;
 
public class MainFrame extends javax.swing.JFrame {
 
    public MainFrame() {
        initComponents();
    }
 
    private void initComponents() {
 
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
 
        jButton1.setText("Second JFrame");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
        getContentPane().add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(180, 280, -1, -1));
 
        jButton2.setText("Tab in TabbedPane");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });
        getContentPane().add(jButton2, new org.netbeans.lib.awtextra.AbsoluteConstraints(390, 280, -1, -1));
 
        pack();
    }                   
 
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        new SecondFrame().setVisible(true);
    }                                        
 
    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
 
    }                                        
 
    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 ("Windows".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MainFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
 
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MainFrame().setVisible(true);
            }
        });
    }
 
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;

Here's my code for JFrame 2

package com.shawnquigley.testproject;
 
public class SecondFrame extends javax.swing.JFrame {
 
    public SecondFrame() {
        initComponents();
    }
 
    private void initComponents() {
 
        jTabbedPane1 = new javax.swing.JTabbedPane();
        FirstTab = new javax.swing.JPanel();
        SecondTab = new javax.swing.JPanel();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
 
        javax.swing.GroupLayout FirstTabLayout = new javax.swing.GroupLayout(FirstTab);
        FirstTab.setLayout(FirstTabLayout);
        FirstTabLayout.setHorizontalGroup(
            FirstTabLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 535, Short.MAX_VALUE)
        );
        FirstTabLayout.setVerticalGroup(
            FirstTabLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 342, Short.MAX_VALUE)
        );
 
        jTabbedPane1.addTab("First Tab", FirstTab);
 
        javax.swing.GroupLayout SecondTabLayout = new javax.swing.GroupLayout(SecondTab);
        SecondTab.setLayout(SecondTabLayout);
        SecondTabLayout.setHorizontalGroup(
            SecondTabLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 535, Short.MAX_VALUE)
        );
        SecondTabLayout.setVerticalGroup(
            SecondTabLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 342, Short.MAX_VALUE)
        );
 
        jTabbedPane1.addTab("Second Tab", SecondTab);
 
        getContentPane().add(jTabbedPane1, new org.netbeans.lib.awtextra.AbsoluteConstraints(70, 70, 540, 370));
 
        pack();
    }                       
 
    /**
     * @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 ("Windows".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(SecondFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(SecondFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(SecondFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(SecondFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
 
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new SecondFrame().setVisible(true);
            }
        });
    }
 
    public javax.swing.JPanel FirstTab;
    public javax.swing.JPanel SecondTab;
    public javax.swing.JTabbedPane jTabbedPane1;
 
}

**Norm** · May 28th, 2019, 05:55 AM

I'm using Netbeans IDE if that helps

That is a problem because Netbeans uses none standard classes that are not available to non-Netbeans users.
For example: org.netbeans.lib.awtextra.AbsoluteConstraints

Also the IDE builds the contents of the classes, making it hard to modify.

i want to go to the second tab in the second jframe

To call a method in another class, you need the reference to an instance of the class.
Where is the reference to the second jframe class?

To go to a tab in a JTabbedPane, you need to call a method for that class the tells it what component to go to.
Normally those methods are named with a name starting with set. Read the API doc to find what method to use.
Then write a method in the second frame class that calls that method.
Then in the first frame class, call that method using the reference to the instance of the second class.

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