java如何实现乌龟爬行_请教：一只乌龟的运动

import java.awt.*;

import java.awt.event.*;

import java.util.EventListener;

/*打算你按上，乌龟上爬，按下，乌龟下爬。但是一直没有repaint，怎么回事呀，请教下什么地方错了，怎么才能动。*/

public class WuGui{

public static void main(String args[]){

Frame f = new Frame();

f.setSize(1024, 860);

MyPanel m = new MyPanel();

f.add(m);

f.setVisible(true);

}

}

class MyPanel extends Panel implements KeyListener{

int b = 250;//body Y

int h = 200;//head Y

int f1 = 270;//hand F

int f2 = 270;//hand F

int s1 = 400;//hang S

int s2 = 400;//hang S

int ey = 220; boolean a = true;

public MyPanel(){

this.addKeyListener(this);

}

public void paint(Graphics g){

//super.paint(g);

g.setColor(Color.BLUE); /* draw backGround begin*/

g.fillRect(1,1,1024,860);

g.setColor(Color.GREEN);

g.fillOval(330,b,140,200); /* draw body */

g.fillOval(370,h,60,100);

g.setColor(Color.BLACK);

g.fillOval(370,ey,10,10);

g.fillOval(420,ey,10,10); /* draw head */

g.setColor(Color.GREEN);

g.fillOval(310,f1,70,30); /* draw left up */

g.fillOval(310,s1,70,30); /* draw left down */

g.fillOval(420,f2,70,30); /* draw right up*/

g.fillOval(420,s2,70,30); /* draw right down*/

}

public void keyTyped(KeyEvent e) {

}

public void keyPressed(KeyEvent e) {

// TODO: Add your code here

if(KeyEvent.VK_UP == e.getKeyCode())

{

if(a == true)

{

a = false;

f1=f1-10;

s2=s2-10;

b=b-5;

h=h-5;

ey=ey-5;

}else{

a = true;

f2=f2-10;

s1=s1-10;

b=b-5;

h=h-5;

ey=ey-5;

}

repaint();

}

if(KeyEvent.VK_DOWN == e.getKeyCode())

{

if(a == true)

{

a = false;

f2=f2+10;

s1=s1+10;

b=b+5;

h=h+5;

ey=ey+5;

}else{

a = true;

f1=f1+10;

s2=s2+10;

b=b+5;

h=h+5;

ey=ey+5;

}

repaint();

}

}

public void keyReleased(KeyEvent e) {

}

}

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