java swing ContainerListener 示例，,package cn.o

java swing ContainerListener 示例，,package cn.o

package cn.outofmemory.snippets.desktop;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 ContainerListenerExample {    public static void main(String args[]) {        JFrame jFrame = new JFrame();        Container cPane = jFrame.getContentPane();        ContainerListener containerListener = new ContainerListener() {            ActionListener actiListener = new ActionListener() {                @Override                public void actionPerformed(ActionEvent event) {                    System.out.println("Select: " + event.getActionCommand());                }            };            @Override            public void componentAdded(ContainerEvent event) {                Component compChild = event.getChild();                if (compChild instanceof JButton) {                    JButton jButton = (JButton) compChild;                    jButton.addActionListener(actiListener);                }            }            @Override            public void componentRemoved(ContainerEvent event) {                Component compChild = event.getChild();                if (compChild instanceof JButton) {                    JButton Jbutton = (JButton) compChild;                    Jbutton.removeActionListener(actiListener);                }            }        };        cPane.addContainerListener(containerListener);        cPane.setLayout(new GridLayout(3, 2));        cPane.add(new JButton("First"));        cPane.add(new JButton("Second"));        cPane.add(new JButton("Third"));        cPane.add(new JButton("Fourth"));        cPane.add(new JButton("Fifth"));        jFrame.setSize(400, 300);        jFrame.show();    }}