首页手记 Java 键盘控制一个小球

Java 键盘控制一个小球

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Java

俩 class
one panel类
一个测试类。
目标是实现用键盘去控制一个物体。此处是控制一个小球
贴代码
main类
`package com.imooc.ruige;
import java.awt.;
import java.awt.event.;
public class KeyTest {
public static void main(String[] srgs){
Frame w =new Frame();
w.setSize(600,800);
MyPanel mp = new MyPanel();
w.add(mp);
w.addKeyListener(mp);
mp.addKeyListener(mp);
w.show();

}
}
panel类 package com.imooc.ruige;

import java.awt.Graphics;
import java.awt.Panel;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

public class MyPanel extends Panel implements KeyListener {

int x=200;
int y =300;
public void paint(Graphics g){
    if(!(x<0||x>600||y<0||y>800))
    g.fillOval(x, y, 40, 40);
    else
        {x=200;
      y=300;}
}

@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(e.getKeyCode());
    moveBall(e);
    repaint();

}

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

}
void moveBall(KeyEvent e){
    switch(e.getKeyCode())
    {
        case 37:x-=10;
        break;
        case 38:y-=10;
        break;
        case 39:x+=10;
        break;
        case 40:y+=10;
        break;
        default:
        break;
    }
}

}
`

贴一下事件处理的流程--------->>