12.窗口监听事件

也没啥，就是之前讲过的
此外值得注意的点也就，匿名内部类的使用而已

package GUI;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class Test12_Windows {
    public static void main(String[] args) {
        new WindowFrame();
    }
}

class WindowFrame extends Frame {
    public WindowFrame() {
        setSize(500, 500);
        setVisible(true);
        addWindowListener(new WindowAdapter() {
            // 常用的也就这两
            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("windowClosing");
            }

            @Override
            public void windowActivated(WindowEvent e) {
                System.out.println("windowActivated");
            }
      /* 用不上的
            @Override
            public void windowOpened(WindowEvent e) {
                System.out.println("windowOpened");
            }

            @Override
            public void windowClosed(WindowEvent e) {
                System.out.println("windowClosed");
            }

       */
        });
    }
}

    /*
    // 这是内部类，还可以弄成匿名内部类（就不用想名字和担心名字重复）
    class MyWindowListener extends WindowAdapter{
        @Override
        public void windowClosing(WindowEvent e) {
            setVisible(false);  // 隐藏当前窗口，但还存在
           // System.exit(0);
        }
    }
}

     */