Determining When the Selected Tab Changes in a JTabbedPane Container

 

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

public class Main {
  public static void main(String[] argv) throws Exception {

    JTabbedPane pane = new JTabbedPane();

    pane.addChangeListener(new ChangeListener() {
      public void stateChanged(ChangeEvent evt) {
        JTabbedPane pane = (JTabbedPane) evt.getSource();

        int sel = pane.getSelectedIndex();
        System.out.println(sel);
      }
    });
  }
}

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Determining When the Selected Tab Changes in a JTabbedPane Container : TabbedPane « Swing JFC « Java

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