事件处理1-2

能动的小球

/*
 * 功能：能动的小球
 * 用鼠标上下左右键控制
 * */


package com.littleball;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class LittleBall_1 extends JFrame {
	MyPanel mp=null;
	

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		LittleBall_1 ball=new LittleBall_1();

	}
	public LittleBall_1()
	{
		mp=new MyPanel();
		this.add(mp);
		this.addKeyListener(mp);
		this.setTitle("控制小球");
		this.setSize(200,200);
	
		
		this.setLocation(450,300);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setVisible(true);
	}

	
}
//定义我的panel
class MyPanel extends JPanel implements KeyListener
{
	int x=10;
	int y=10;
	public void paint(Graphics g)
	{
		super.paint(g);
		g.fillOval(x,y, 10,10);
	}
	@Override
	public void keyTyped(KeyEvent e) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void keyPressed(KeyEvent e) {
		// TODO Auto-generated method stub
		//System.out.println("键被按下"+(char)e.getKeyCode());
        if(e.getKeyCode()==KeyEvent.VK_DOWN&&y<100) {
        	//System.out.println("dnow键被按下");
        	y++;
        	this.repaint();
        	
        }else if(e.getKeyCode()==KeyEvent.VK_RIGHT&&x<180) {
        	x++;
        	this.repaint();
        }else if(e.getKeyCode()==KeyEvent.VK_UP&&y>0) {
        	y--;
        	this.repaint();
        }else if(e.getKeyCode()==KeyEvent.VK_LEFT&&x>0) {
        	x--;
        	this.repaint();
        }
        
	}

	@Override
	public void keyReleased(KeyEvent e) {
		// TODO Auto-generated method stub
		
	}

}