键盘监听事件-2022-12-10

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.sql.SQLOutput;

public class keyListenerDemo {
    public static void main(String[] args) {
        new myKeyFrame();
    }
}
class myKeyFrame extends Frame{
    public myKeyFrame(){
        setBounds(100,100,400,300);
        setBackground(Color.BLUE);
        setVisible(true);
   
        this.addKeyListener(new KeyAdapter() {
            //匿名内部类
            @Override
            public void keyPressed(KeyEvent e) {
                //super.keyPressed(e);
                int keycode = e.getKeyCode();
                System.out.println(keycode);
                if (keycode==KeyEvent.VK_UP){
                    System.out.println("你按下了向上键");
                }
            }
        });
    }
}