Java Swing Tutorial - Java ContainerListener .componentAdded (ContainerEvent e)


ContainerListener.componentAdded(ContainerEvent e) has the following syntax.

void componentAdded(ContainerEvent e)


In the following code shows how to use ContainerListener.componentAdded(ContainerEvent e) method.

/*from   www .ja  v  a  2  s .com*/
import java.awt.Component;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ContainerEvent;
import java.awt.event.ContainerListener;

import javax.swing.JButton;
import javax.swing.JFrame;

public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame();
    Container contentPane = frame.getContentPane();

    ContainerListener cont = new ContainerListener() {
      ActionListener listener = new ActionListener() {
        public void actionPerformed(ActionEvent e) {
          System.out.println("Selected: " + e.getActionCommand());

      public void componentAdded(ContainerEvent e) {
        Component c = e.getChild();
        if (c instanceof JButton) {
          JButton b = (JButton) c;

      public void componentRemoved(ContainerEvent e) {
        Component c = e.getChild();
        if (c instanceof JButton) {
          JButton b = (JButton) c;


    contentPane.setLayout(new GridLayout(3, 2));
    contentPane.add(new JButton("First"));
    contentPane.add(new JButton("Second"));
    contentPane.add(new JButton("Third"));
    contentPane.add(new JButton("Fourth"));
    contentPane.add(new JButton("Fifth"));

    frame.setSize(300, 200);;