How to call a certain function when click on a Tab in Java?

Question

In a panel i have 3 Tabs (using JTabbedPane). The user can do whatever he wants in Tab1 or Tab2, but when he switches to Tab3 I want him to see the results of what he did in Tab2 or Tab1.

How do I do this? I think I have to call a function when the user clicks on Tab3?

Answer 1

You can add a ChangeListener on your TabbedPane. This snippet shows you how to add the Listener and how to indicate which Tab is active:

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class TestTabbedPane {

static JTabbedPane p;
static JFrame f;
public static void main(String[] args) {

    f = new JFrame();
    f.setSize(800,600);
    f.setLocationRelativeTo(null);

    p = new JTabbedPane();
    p.addTab("T1", new JPanel());
    p.addTab("T2", new JPanel());
    p.addTab("T3", new JPanel());

    p.addChangeListener(new ChangeListener() { //add the Listener

        public void stateChanged(ChangeEvent e) {

            System.out.println(""+p.getSelectedIndex());

            if(p.getSelectedIndex()==2) //Index starts at 0, so Index 2 = Tab3
            {
                //do your stuff on Tab 3
            }
        }
    });
    f.add(p);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
}
}