java贪吃蛇问题求助
看教程写了个不完整的贪吃蛇程序，可是除了点问题找不到哪里错了，请高手帮忙看下，蛇走过的痕迹不会抹去。。。。。
程序代码：第一个class 是snakeWin
package game;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.List;
public class snakeWin extends JPanel implements ActionListener,KeyListener{
JButton newGame , stopGame;
int point=0 , Speed=0;
boolean Start = false;
Random r = new Random();
int rx = 0 , ry = 0 ;
List<snakeAct> list = new ArrayList<snakeAct>();
public snakeWin() {
newGame = new JButton("开始");
stopGame = new JButton("退出");
this.setLayout(new FlowLayout(FlowLayout.LEFT));
newGame.addActionListener(this);
stopGame.addActionListener(this);
this.addKeyListener(this);
this.add(newGame);
this.add(stopGame);
}
public void paintComponent(Graphics g) {
super.paintComponents(g);
g.drawRect(10 , 40 , 400 , 300);
g.drawString("分数： " +point, 150, 25);
g.drawString("速度： " +Speed, 220, 25);
g.setColor(new Color(0,255,0));
if(Start){
g.fillRect(10+rx*10, 40+ry*10, 10, 10);
g.setColor(new Color(255,0,0));
for(int i=0 ; i<list.size(); i++){
g.fillRect(10+list.get(i).getX()*10, 40+list.get(i).getY()*10, 10, 10);
}
}
}
public void actionPerformed(ActionEvent e) {
if (e.getSource()==newGame){
newGame.setEnabled(false);
Start = true;
rx = r.nextInt(40);ry = r.nextInt(30);
snakeAct tempAct = new snakeAct();
tempAct.setX(20);
tempAct.setY(15);
list.add(tempAct);
requestFocus(true);
repaint();
}
if (e.getSource()==stopGame){
System.exit(0);
}
}
private void eat(){
if(rx==list.get(0).getX()&&ry==list.get(0).getY()) {
rx = r.nextInt(40);ry = r.nextInt(30);
snakeAct tempAct = new snakeAct();
tempAct.setX(list.get(list.size()-1).getX());
tempAct.setY(list.get(list.size()-1).getY());
list.add(tempAct);
}
}
public void otherMove(){
snakeAct tempAct = new snakeAct();
for(int i=0; i<list.size(); i++){
if(i==1){
list.get(i).setX(list.get(0).getX());
list.get(i).setY(list.get(0).getY());
}else if(i>1){
tempAct = list.get(i-1);
list.set(i-1, list.get(i));
list.set(i, tempAct);
}
}
}
public void move(int x , int y){
if (minYes(x,y)){
list.get(0).setX(list.get(0).getX()+x);
list.get(0).setY(list.get(0).getY()+y);
eat();
repaint();
}else {
}
}
public boolean minYes(int x , int y){
if(!maxYes(list.get(0).getX()+x,list.get(0).getY()+y))
return false;
return true;
}
public boolean maxYes(int x , int y){
if(x<0||x>=40||y<0||y>=30) {
return false;
}
return true;
}
public void keyPressed(KeyEvent e) {
if (Start){
switch (e.getKeyCode()){
case KeyEvent.VK_UP:
move(0 , -1);
break;
case KeyEvent.VK_DOWN:
move(0 , 1);
break;
case KeyEvent.VK_LEFT:
move(-1 , 0);
break;
case KeyEvent.VK_RIGHT:
move(1 , 0);
break;
default:
break;
}
}
}
@Override
public void keyReleased(KeyEvent e) {
}
public void keyTyped(KeyEvent e) {
}
}
第二个class是snakeMain
package game;
import javax.swing.*;
public class snakeMain extends JFrame {
public snakeMain() {
snakeWin win = new snakeWin();
add(win);
setTitle("贪吃蛇1.0V~~~杨扬鹏作品");
setSize(435,390);
setLocation(200,200);
setVisible(true);
}
public static void main(String args[]){
new snakeMain();
}
}第三个class是snakeAct
package game;
public class snakeAct {
private int x;
private int y;
public int getX() {
return x;
}
public void setX(int x) {
this.x = x;
}
public int getY() {
return y;
}
public void setY(int y) {
this.y = y;
}
}
三个class放在game包里面，下面是问题的截图：
