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你不是有个temp的标识吗？可以用这个判断撒，记录上一状态。
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修改如下：
public void keyPressed(KeyEvent e) {
if (start){
switch (e.getKeyCode()){
case KeyEvent.VK_UP:
if(temp==2) break;
move(0,-1);
temp =1;
break;
case KeyEvent.VK_DOWN:
if(temp==1) break;
move(0,1);
temp =2;
break;
case KeyEvent.VK_LEFT:
if(temp==4) break;
move(-1,0);
temp =3;
break;
case KeyEvent.VK_RIGHT:
if(temp==3) break;
move(1,0);
temp =4;
break;
default:
break;
}
}
}
贪吃蛇
import java.awt.*;
import java.awt.event.*;
public class GreedSnake //主类
{
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new MyWindow();
}
}
class MyPanel extends Panel implements KeyListener,Runnable//自定义面板类，继承了键盘和线程接口
{
Button snake[]; //定义蛇按钮
int shu=0; //蛇的节数
int food[]; //食物数组
boolean result=true; //判定结果是输 还是赢
Thread thread; //定义线程
static int weix,weiy; //食物位置
boolean t=true; //判定游戏是否结束
int fangxiang=0; //蛇移动方向
int x=0,y=0; //蛇头位置
MyPanel()
{
setLayout(null);
snake=new Button[20];
food=new int [20];
thread=new Thread(this);
for(int j=0;j20;j++)
{
food[j]=(int)(Math.random()*99);//定义20个随机食物
}
weix=(int)(food[0]*0.1)*60; //十位*60为横坐标
weiy=(int)(food[0]%10)*40; //个位*40为纵坐标
for(int i=0;i20;i++)
{
snake[i]=new Button();
}
add(snake[0]);
snake[0].setBackground(Color.black);
snake[0].addKeyListener(this); //为蛇头添加键盘监视器
snake[0].setBounds(0,0,10,10);
setBackground(Color.cyan);
}
public void run() //接收线程
{
while(t)
{
if(fangxiang==0)//向右
{
try
{
x+=10;
snake[0].setLocation(x, y);//设置蛇头位置
if(x==weixy==weiy) //吃到食物
{
shu++;
weix=(int)(food[shu]*0.1)*60;
weiy=(int)(food[shu]%10)*40;
repaint(); //重绘下一个食物
add(snake[shu]); //增加蛇节数和位置
snake[shu].setBounds(snake[shu-1].getBounds());
}
thread.sleep(100); //睡眠100ms
}
catch(Exception e){}
}
else if(fangxiang==1)//向左
{
try
{
x-=10;
snake[0].setLocation(x, y);
if(x==weixy==weiy)
{
shu++;
weix=(int)(food[shu]*0.1)*60;
weiy=(int)(food[shu]%10)*40;
repaint();
add(snake[shu]);
snake[shu].setBounds(snake[shu-1].getBounds());
}
thread.sleep(100);
}
catch(Exception e){}
}
else if(fangxiang==2)//向上
{
try
{
y-=10;
snake[0].setLocation(x, y);
if(x==weixy==weiy)
{
shu++;
weix=(int)(food[shu]*0.1)*60;
weiy=(int)(food[shu]%10)*40;
repaint();
add(snake[shu]);
snake[shu].setBounds(snake[shu-1].getBounds());
}
thread.sleep(100);
}
catch(Exception e){}
}
else if(fangxiang==3)//向下
{
try
{
y+=10;
snake[0].setLocation(x, y);
if(x==weixy==weiy)
{
shu++;
weix=(int)(food[shu]*0.1)*60;
weiy=(int)(food[shu]%10)*40;
repaint();
add(snake[shu]);
snake[shu].setBounds(snake[shu-1].getBounds());
}
thread.sleep(100);
}
catch(Exception e){}
}
int num1=shu;
while(num11)//判断是否咬自己的尾巴
{
if(snake[num1].getBounds().x==snake[0].getBounds().xsnake[num1].getBounds().y==snake[0].getBounds().y)
{
t=false;
result=false;
repaint();
}
num1--;
}
if(x0||x=this.getWidth()||y0||y=this.getHeight())//判断是否撞墙
{
t=false;
result=false;
repaint();
}
int num=shu;
while(num0) //设置蛇节位置
{
snake[num].setBounds(snake[num-1].getBounds());
num--;
}
if(shu==15) //如果蛇节数等于15则胜利
{
t=false;
result=true;
repaint();
}
}
}
public void keyPressed(KeyEvent e) //按下键盘方向键
{
if(e.getKeyCode()==KeyEvent.VK_RIGHT)//右键
{
if(fangxiang!=1)//如果先前方向不为左
fangxiang=0;
}
else if(e.getKeyCode()==KeyEvent.VK_LEFT)
{ if(fangxiang!=0)
fangxiang=1;
}
else if(e.getKeyCode()==KeyEvent.VK_UP)
{ if(fangxiang!=3)
fangxiang=2;
}
else if(e.getKeyCode()==KeyEvent.VK_DOWN)
{ if(fangxiang!=2)
fangxiang=3;
}
}
public void keyTyped(KeyEvent e)
{
}
public void keyReleased(KeyEvent e)
{
}
public void paint(Graphics g) //在面板上绘图
{
int x1=this.getWidth()-1;
int y1=this.getHeight()-1;
g.setColor(Color.red);
g.fillOval(weix, weiy, 10, 10);//食物
g.drawRect(0, 0, x1, y1); //墙
if(t==falseresult==false)
g.drawString("GAME OVER!", 250, 200);//输出游戏失败
else if(t==falseresult==true)
g.drawString("YOU WIN!", 250, 200);//输出游戏成功
}
}
class MyWindow extends Frame implements ActionListener//自定义窗口类
{
MyPanel my;
Button btn;
Panel panel;
MyWindow()
{
super("GreedSnake");
my=new MyPanel();
btn=new Button("begin");
panel=new Panel();
btn.addActionListener(this);
panel.add(new Label("begin后请按Tab键选定蛇"));
panel.add(btn);
panel.add(new Label("按上下左右键控制蛇行动"));
add(panel,BorderLayout.NORTH);
add(my,BorderLayout.CENTER);
setBounds(100,100,610,500);
setVisible(true);
validate();
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)//按下begin按钮
{
if(e.getSource()==btn)
{
try
{
my.thread.start(); //开始线程
my.validate();
}
catch(Exception ee){}
}
}
}
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
public class InterFace extends JFrame {
/**
* WIDTH:宽
* HEIGHT:高
* SLEEPTIME:可以看作蛇运动的速度
* L = 1,R = 2, U = 3, D = 4 左右上下代码
*/
public static final int WIDTH = 800, HEIGHT = 600, SLEEPTIME = 200, L = 1,R = 2, U = 3, D = 4;
BufferedImage offersetImage= new BufferedImage(WIDTH, HEIGHT,BufferedImage.TYPE_3BYTE_BGR);;
Rectangle rect = new Rectangle(20, 40, 15 * 50, 15 * 35);
Snake snake;
Node node;
public InterFace() {
//创建"蛇"对象
snake = new Snake(this);
//创建"食物"对象
createNode();
this.setBounds(100, 100, WIDTH, HEIGHT);
//添加键盘监听器
this.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent arg0) {
System.out.println(arg0.getKeyCode());
switch (arg0.getKeyCode()) {
//映射上下左右4个键位
case KeyEvent.VK_LEFT:
snake.dir = L;
break;
case KeyEvent.VK_RIGHT:
snake.dir = R;
break;
case KeyEvent.VK_UP:
snake.dir = U;
break;
case KeyEvent.VK_DOWN:
snake.dir = D;
}
}
});
this.setTitle("贪吃蛇 0.1 By ： Easy");
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setVisible(true);
//启动线程,开始执行
new Thread(new ThreadUpadte()).start();
}
public void paint(Graphics g) {
Graphics2D g2d = (Graphics2D) offersetImage.getGraphics();
g2d.setColor(Color.white);
g2d.fillRect(0, 0, WIDTH, HEIGHT);
g2d.setColor(Color.black);
g2d.drawRect(rect.x, rect.y, rect.width, rect.height);
//如果蛇碰撞(吃)到食物，则创建新食物
if (snake.hit(node)) {
createNode();
}
snake.draw(g2d);
node.draw(g2d);
g.drawImage(offersetImage, 0, 0, null);
}
class ThreadUpadte implements Runnable {
public void run() {
//无限重绘画面
while (true) {
try {
Thread.sleep(SLEEPTIME);
repaint(); //
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
/**
* 创建食物
*/
public void createNode() {
//随机食物的出现位置
int x = (int) (Math.random() * 650) + 50,y = (int) (Math.random() * 500) + 50;
Color color = Color.blue;
node = new Node(x, y, color);
}
public static void main(String args[]) {
new InterFace();
}
}
/**
* 节点类(包括食物和蛇的身躯组成节点)
*/
class Node {
int x, y, width = 15, height = 15;
Color color;
public Node(int x, int y, Color color) {
this(x, y);
this.color = color;
}
public Node(int x, int y) {
this.x = x;
this.y = y;
this.color = color.black;
}
public void draw(Graphics2D g2d) {
g2d.setColor(color);
g2d.drawRect(x, y, width, height);
}
public Rectangle getRect() {
return new Rectangle(x, y, width, height);
}
}
/**
* 蛇
*/
class Snake {
public ListNode nodes = new ArrayListNode();
InterFace interFace;
int dir=InterFace.R;
public Snake(InterFace interFace) {
this.interFace = interFace;
nodes.add(new Node(20 + 150, 40 + 150));
addNode();
}
/**
* 是否碰撞到食物
* @return true 是 false 否
*/
public boolean hit(Node node) {
//遍历整个蛇体是否与食物碰撞
for (int i = 0; i nodes.size(); i++) {
if (nodes.get(i).getRect().intersects(node.getRect())) {
addNode();
return true;
}
}
return false;
}
public void draw(Graphics2D g2d) {
for (int i = 0; i nodes.size(); i++) {
nodes.get(i).draw(g2d);
}
move();
}
public void move() {
nodes.remove((nodes.size() - 1));
addNode();
}
public synchronized void addNode() {
Node nodeTempNode = nodes.get(0);
//如果方向
switch (dir) {
case InterFace.L:
//判断是否会撞墙
if (nodeTempNode.x = 20) {
nodeTempNode = new Node(20 + 15 * 50, nodeTempNode.y);
}
nodes.add(0, new Node(nodeTempNode.x - nodeTempNode.width,
nodeTempNode.y));
break;
case InterFace.R:
//判断是否会撞墙
if (nodeTempNode.x = 20 + 15 * 50 - nodeTempNode.width) {
nodeTempNode = new Node(20 - nodeTempNode.width, nodeTempNode.y);
}
nodes.add(0, new Node(nodeTempNode.x + nodeTempNode.width,
nodeTempNode.y));
break;
case InterFace.U:
//判断是否会撞墙
if (nodeTempNode.y = 40) {
nodeTempNode = new Node(nodeTempNode.x, 40 + 15 * 35);
}
nodes.add(0, new Node(nodeTempNode.x, nodeTempNode.y - nodeTempNode.height));
break;
case InterFace.D:
//判断是否会撞墙
if (nodeTempNode.y = 40 + 15 * 35 - nodeTempNode.height) {
nodeTempNode = new Node(nodeTempNode.x,40 - nodeTempNode.height);
}
nodes.add(0, new Node(nodeTempNode.x, nodeTempNode.y + nodeTempNode.height));
break;
}
}
}
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
public class SnakeGame extends JFrame implements KeyListener{
private int stat=1,direction=0,bodylen=6,headx=7,heady=8,
tailx=1,taily=8,tail,foodx,foody,food;//初始化定义变量
public final int EAST=1,WEST=2,SOUTH=3,NORTH=4;//方向常量
int [][] fillblock=new int [20][20];//定义蛇身所占位置
public SnakeGame() {//构造函数
super("贪吃蛇");
setSize(510,510);
setVisible(true);//设定窗口属性
addKeyListener(this);//添加监听
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
for(int i=1;i=7;i++) fillblock[i][8]=EAST;//初始化蛇身属性
direction=EAST;//方向初始化的设置
FoodLocate(); //定位食物
while (stat==1){
fillblock[headx][heady]=direction;
switch(direction){
case 1:headx++;break;
case 2:headx--;break;
case 3:heady++;break;
case 4:heady--;break;
}//蛇头的前进
if(heady19||headx19||tailx19||taily19||heady0||headx0||tailx0||taily0||fillblock[headx][heady]!=0){
stat=0;
break;
} //判断游戏是否结束
try{
Thread.sleep(150); }
catch(InterruptedException e){}//延迟
fillblock[headx][heady]=direction;
if(headx==foodxheady==foody){//吃到食物
FoodLocate();
food=2;
try{
Thread.sleep(100); }
catch(InterruptedException e){}//延迟
}
if(food!=0)food--;
else{tail=fillblock[tailx][taily];
fillblock[tailx][taily]=0;//蛇尾的消除
switch(tail){
case 1:tailx++;break;
case 2:tailx--;break;
case 3:taily++;break;
case 4:taily--;break;
}//蛇尾的前进
}
repaint();
}
if(stat==0)
JOptionPane.showMessageDialog(null,"GAME OVER","Game Over",JOptionPane.INFORMATION_MESSAGE);
}
public void keyPressed(KeyEvent e) {//按键响应
int keyCode=e.getKeyCode();
if(stat==1) switch(keyCode){
case KeyEvent.VK_UP:if(direction!=SOUTH) direction=NORTH;break;
case KeyEvent.VK_DOWN:if(direction!=NORTH)direction=SOUTH;break;
case KeyEvent.VK_LEFT:if(direction!=EAST)direction=WEST;break;
case KeyEvent.VK_RIGHT:if (direction!=WEST)direction=EAST;break;
}
}
public void keyReleased(KeyEvent e){}//空函数
public void keyTyped(KeyEvent e){} //空函数
public void FoodLocate(){//定位食物坐标
do{
Random r=new Random();
foodx=r.nextInt(20);
foody=r.nextInt(20);
}while (fillblock[foodx][foody]!=0);
}
public void paint(Graphics g){//画图
super.paint(g);
g.setColor(Color.BLUE);
for(int i=0;i20;i++)
for(int j=0;j20;j++)
if (fillblock[i][j]!=0)
g.fillRect(25*i+5,25*j+5,24,24);
g.setColor(Color.RED);
g.fillRect(foodx*25+5,foody*25+5,24,24);
}
public static void main(String[] args) {//主程序
SnakeGame application=new SnakeGame();
}
}