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：
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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 method
public 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
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