本人初学JAVA，写了一个简易的贪吃蛇，运行的时候有时候吃到豆子能变长，有时候吃豆子不能变长不知道为什么，代码如下
Snake类：
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.*;
public class Snake extends JPanel implements KeyListener{
private int direction=South;
ArrayList<Integer> Bufferbody=new ArrayList<Integer>();
ArrayList<Integer> body=new ArrayList<Integer>();
int foodX=300;
int foodY=300;
int headX=100;
int headY=100;
int souse=0;
int O=0;
public static final int South=0;
public static final int North=1;
public static final int East=2;
public static final int West=3;
Random rand=new Random();
private Image iBuffer;
private Graphics gBuffer;
public void setBufferbody() {
Bufferbody.add(0,100);
Bufferbody.add(1,100);
}
@Override
public void paint(Graphics g) {
// TODO Auto-generated method stub
super.paint(g);
setBackground(Color.gray);
g.setColor(Color.BLUE);
g.fillRect(600, 0, 100, 600);
Font font=new Font("微软雅黑",Font.BOLD,30);
g.setFont(font);
g.setColor(Color.BLACK);
g.drawString("分数", 612, 100);
if(souse==0)
g.drawString(""+souse, 630, 150);
if(souse>0&&souse<=90)
g.drawString(""+souse, 623, 150);
if(souse>90)
g.drawString(""+souse, 612, 150);
g.fillRect(headX, headY,10 ,10 );
while(foodX==headX&&foodY==headY) {
foodX=rand.nextInt(60)*10;
foodY=rand.nextInt(56)*10;
}
g.setColor(Color.YELLOW);
g.fillRect(foodX, foodY, 10, 10);
if(O==0) {
g.setColor(Color.red);
g.drawString("按A开始游戏", 200, 300);
}
for(int i=0;i<body.size();i++) {
Bufferbody.set(i+2,body.get(i));
}
for(int i=0;i<body.size();i++) {
body.set(i,Bufferbody.get(i));
}
for(int i=0;i<body.size();i=i+2) {
g.setColor(Color.green);
g.fillRect(body.get(i), body.get(i+1), 10, 10);
}
if(O==-1) {
g.setColor(Color.red);
g.drawString("Game Over",200, 200);
g.drawString("按R重新游戏", 200, 300);
}
}
public void update(Graphics g) {
if(iBuffer==null) {
iBuffer=createImage(700,600);
gBuffer=getGraphics();
}
gBuffer.setColor(getBackground());
gBuffer.fillRect(0, 0, 700, 600);
paint(gBuffer);
g.drawImage(iBuffer, 0, 0, this);
}
public void move() {
new Thread() {
public void run() {
while(true) {
System.out.print("");
if(O==1) {
switch(direction) {
case South:
Bufferbody.set(0,headX);
Bufferbody.set(1,headY);
headY=headY+10;
repaint();
break;
case North:
Bufferbody.set(0,headX);
Bufferbody.set(1,headY);
headY=headY-10;
repaint();
break;
case East:
Bufferbody.set(0,headX);
Bufferbody.set(1,headY);
headX=headX+10;
repaint();
break;
case West:
Bufferbody.set(0,headX);
Bufferbody.set(1,headY);
headX=headX-10;
repaint();
break;
}
if(headX==foodX&&headY==foodY) {
Bufferbody.add(0);
Bufferbody.add(0);
body.add(Bufferbody.get(Bufferbody.size()-2));
body.add(Bufferbody.get(Bufferbody.size()-1));
souse=souse+10;
repaint();
}
if(headX<0||headY<0||headX==600||headY==560) {
O=-1;
repaint();
break;
}
for(int i=0;i<body.size();i=i+2) {
if(headX==body.get(i)&&headY==body.get(i+1)) {
O=-1;
repaint();
break;
}
}
}
try {
Thread.sleep(140);
} catch (InterruptedException e) {
// TODO: handle exception
}
}
}
}.start();
}
@Override
public void keyPressed(KeyEvent a) {
// TODO Auto-generated method stub
if(a.getKeyCode()==65&&O==0) {
O=1;
repaint();
}
if(O==1) {
switch(a.getKeyCode()) {
case KeyEvent.VK_UP:
if(direction==East||direction==West)
direction=North;
break;
case KeyEvent.VK_RIGHT:
if(direction==South||direction==North)
direction=East;
break;
case KeyEvent.VK_DOWN:
if(direction==East||direction==West)
direction=South;
break;
case KeyEvent.VK_LEFT:
if(direction==South||direction==North)
direction=West;
break;
}
}
if(a.getKeyCode()==82&&O==-1) {
direction=South;
foodX=300;
foodY=300;
headX=100;
headY=100;
souse=0;
Bufferbody.clear();
body.clear();
setBufferbody();
O=0;
move();
repaint();
}
if(a.getKeyCode()==32&&O==1) {
O=0;
repaint();
}
if(a.getKeyCode()==KeyEvent.VK_ESCAPE) {
System.exit(0);
}
}
@Override
public void keyReleased(KeyEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void keyTyped(KeyEvent arg0) {
// TODO Auto-generated method stub
}
}
World类：
import javax.swing.*;
public class World extends JFrame{
public static void main(String[] args) {
JFrame f=new JFrame();
Snake s=new Snake();
f.setSize(700,600);
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(3);
f.setTitle("Snake");
f.add(s);
s.setBufferbody();
s.move();
f.addKeyListener(s);
f.setVisible(true);
}
}
