关闭Java窗体的技巧

　　1.使用JFrame的enableEvents和processWindowEvent
　　//Frame1.java
　　import java.awt.*;
　　import java.awt.event.*;
　　import javax.swing.*;
　　public class Frame1 extends JFrame {
　　public Frame1() {
　　enableEvents(AWTEvent.WINDOW_EVENT_MASK);
　　this.setSize(new Dimension(400, 300));
　　this.setTitle("Frame1");
　　}
　　protected void processWindowEvent(WindowEvent e) {
　　super.processWindowEvent(e);
　　if (e.getID() == WindowEvent.WINDOW_CLOSING) {
　　System.exit(0);
　　}
　　}
　　}
　　2.直接实现WindowListener接口
　　//Frame1.java
　　import java.awt.*;
　　import java.awt.event.*;
　　public class Frame1 extends Frame implements WindowListener {
　　public Frame1() {
　　this.setSize(new Dimension(400, 300));
　　this.setTitle("Frame1");
　　this.addWindowListener(this);
　　}
　　public void windowClosing(WindowEvent windowEvent) {
　　System.exit(0);
　　}
　　public void windowOpened(WindowEvent windowEvent) { }
　　public void windowClosed(WindowEvent windowEvent) { }
　　public void windowIconified(WindowEvent windowEvent) { }
　　public void windowDeiconified(WindowEvent windowEvent) { }
　　public void windowActivated(WindowEvent windowEvent) { }
　　public void windowDeactivated(WindowEvent windowEvent) { }
　　}
　　3.直接继承窗体适配器WindowAdapter
　　//Frame1.java
　　import java.awt.*;
　　import java.awt.event.*;
　　public class Frame1 extends WindowAdapter {
　　public Frame1() {
　　Frame f=new Frame();
　　f.setSize(new Dimension(400, 300));
　　f.setTitle("Frame1");
　　f.addWindowListener(this);
　　f.setVisible(true);
　　}
　　public static void main(String[] s){
　　new Frame1();
　　}
　　public void windowClosing(WindowEvent windowEvent) {
　　System.exit(0);
　　}
　　}