Java的几种事件监听方法
这几天在看Java的图形界面编程，由于上课也没书，几乎没学什么，于是想自己做个堆积木来好好学一下。写完之后，被监听弄得出了好几个问题，幸好学长帮我的忙才对Java的事件驱动模型有了个基本的了解，看来用Java做GUI真的不是件蛮爽的事。后来自己好好总结了一下，想清了下面四种常用的监听方法：
import javax.swing.*;import java.awt.event.*;//The first method//该方法有缺陷，如果本类要继承于另外一个类，那么由于java的单继承机制，该类就不能再继承于适配器类//使用该方法时需要注意适配器类中的方法名字要写正确，否则jdk会认为是新增的方法而不会报错public class JFrameDemo extends WindowAdapter { JFrame jfr; public JFrameDemo(String name) { jfr = new JFrame(name); jfr.setSize(200,100); jfr.setVisible(true); jfr.addWindowListener(this); } public void windowClosing(WindowEvent e) { System.exit(0); } public static void main(String[] args) { new JFrameDemo("jframedemo"); }}//The second methodpublic class JFrameDemo extends JFrame{ public JFrameDemo(String name) { super(name); setSize(200,100); setVisible(true); addWindowListener(new WindowOP()); } public static void main(String[] args) { new JFrameDemo("jramedemo"); }}class WindowOP implements WindowListener{ public void windowClosed(WindowEvent e) {} public void windowActivated(WindowEvent e) {} public void windowClosing(WindowEvent e) { System.exit(0); } public void windowDeactivated(WindowEvent e) {} public void windowDeiconified(WindowEvent e) {} public void windowIconified(WindowEvent e) {} public void windowOpened(WindowEvent e) {}}//The third method//通常而言，这种方法是较好的//将实现接口WindowListener的部份放在class JFrameDemo中，这样就只用一个类//这时在构造方法中添加监听的对象就是this本身了，也就是addWindowListener(this);public class JFrameDemo extends JFrame implements WindowListener{ public JFrameDemo(String name) { super(name); setSize(200,100); setVisible(true); addWindowListener(this); } public void windowClosed(WindowEvent e) {} public void windowActivated(WindowEvent e) {} public void windowClosing(WindowEvent e) { System.exit(0); } public void windowDeactivated(WindowEvent e) {} public void windowDeiconified(WindowEvent e) {} public void windowIconified(WindowEvent e) {} public void windowOpened(WindowEvent e) {}}//The forth method//采用内部类的方法来实现WindowListener接口，即addWindowListener(new WindowListener(){ public void windowCloing(WindowEvent e) {} public void windowActivated(WindowEvent e) {} public void windowClosing(WindowEvent e) { System.exit(0); } public void windowDeactivated(WindowEvent e) {} public void windowDeiconified(WindowEvent e) {} public void windowIconified(WindowEvent e) {} public void windowOpened(WindowEvent e) {}});//但这种方法通常只能用于较小的程序中?