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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;
}
}
}
import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.KeyStroke;
public class 贪吃蛇 extends JFrame implements ActionListener, KeyListener,Runnable {
/**
*
*/
private static final long serialVersionUID = 1L;
private JMenuBar menuBar;
private JMenu youXiMenu,nanDuMenu,fenShuMenu,guanYuMenu;
private JMenuItem kaiShiYouXi,exitItem,zuoZheItem,fenShuItem;
private JCheckBoxMenuItem cJianDan,cPuTong,cKunNan;
private int length = 6;
private Toolkit toolkit;
private int i,x,y,z,objectX,objectY,object=0,growth=0,time;//bojectX,Y
private int m[]=new int[50];
private int n[]=new int[50];
private Thread she = null;
private int life=0;
private int foods = 0;
private int fenshu=0;
public void run(){
time=500;
for(i=0;i=length-1;i++)
{
m[i]=90-i*10;n[i]=60;
}
x=m[0];
y=n[0];
z=4;
while(she!=null)
{
check();
try
{
Thread.sleep(time);
}
catch(Exception ee)
{
System.out.println(z+"");
}
}
}
public 贪吃蛇() {
setVisible(true);
menuBar = new JMenuBar();
toolkit=getToolkit();
youXiMenu = new JMenu("游戏");
kaiShiYouXi = new JMenuItem("开始游戏");
exitItem = new JMenuItem("退出游戏");
nanDuMenu = new JMenu("困难程度");
cJianDan = new JCheckBoxMenuItem("简单");
cPuTong = new JCheckBoxMenuItem("普通");
cKunNan = new JCheckBoxMenuItem("困难");
fenShuMenu = new JMenu("积分排行");
fenShuItem = new JMenuItem("最高记录");
guanYuMenu = new JMenu("关于");
zuoZheItem = new JMenuItem("关于作者");
guanYuMenu.add(zuoZheItem);
nanDuMenu.add(cJianDan);
nanDuMenu.add(cPuTong);
nanDuMenu.add(cKunNan);
fenShuMenu.add(fenShuItem);
youXiMenu.add(kaiShiYouXi);
youXiMenu.add(exitItem);
menuBar.add(youXiMenu);
menuBar.add(nanDuMenu);
menuBar.add(fenShuMenu);
menuBar.add(guanYuMenu);
zuoZheItem.addActionListener(this);
kaiShiYouXi.addActionListener(this);
exitItem.addActionListener(this);
addKeyListener(this);
fenShuItem.addActionListener(this);
KeyStroke keyOpen = KeyStroke.getKeyStroke('O',InputEvent.CTRL_DOWN_MASK);
kaiShiYouXi.setAccelerator(keyOpen);
KeyStroke keyExit = KeyStroke.getKeyStroke('X',InputEvent.CTRL_DOWN_MASK);
exitItem.setAccelerator(keyExit);
setJMenuBar(menuBar);
setTitle("贪吃蛇");
setResizable(false);
setBounds(300,200,400,400);
validate();
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String args[]) {
new 贪吃蛇();
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==kaiShiYouXi)
{
length = 6;
life = 0;
foods = 0;
if(she==null)
{
she=new Thread(this);
she.start();
}
else if(she!=null)
{
she=null;
she= new Thread(this);
she.start();
}
}
if(e.getSource()==exitItem)
{
System.exit(0);
}
if(e.getSource()==zuoZheItem)
{
JOptionPane.showMessageDialog(this, "孤独的野狼制作"+"\n\n"+" "+"QQ号:2442701497"+"\n");
}
if(e.getSource()==fenShuItem)
{
JOptionPane.showMessageDialog(this,"最高记录为"+fenshu+"");
}
}
public void check(){
isDead();
if(she!=null)
{
if(growth==0)
{
reform(); //得到食物
}
else
{
upgrowth(); //生成食物
}
if(x==objectXy==objectY)
{
object=0;
growth=1;
toolkit.beep();
}
if(object==0)
{
object=1;
objectX=(int)Math.floor(Math.random()*39)*10;
objectY=(int)Math.floor(Math.random()*29)*10+50;
}
this.repaint(); //重绘
}
}
void isDead()
{
//判断游戏是否结束的方法
if(z==4)
{
x=x+10;
}
else if(z==3)
{
x=x-10;
}
else if(z==2)
{
y=y+10;
}
else if(z==1)
{
y=y-10;
}
if(x0||x390||y50||y390)
{
she=null;
}
for(i=1;ilength;i++)
{
if(m[i]==xn[i]==y)
{
she=null;
}
}
}
public void upgrowth()
{
//当蛇吃到东西时的方法
if(length50)
{
length++;
}
growth--;
time=time-10;
reform();
life+=100;
if(fenshulife)
{
fenshu = life;
}
foods++;
}
public void reform()
{
for(i=length-1;i0;i--)
{
m[i]=m[i-1];
n[i]=n[i-1];
}
if(z==4)
{
m[0]=m[0]+10;
}
if(z==3)
{
m[0]=m[0]-10;
}
if(z==2)
{
n[0]=n[0]+10;
}
if(z==1)
{
n[0]=n[0]-10;
}
}
public void keyPressed(KeyEvent e)
{
if(she!=null)
{
if(e.getKeyCode()==KeyEvent.VK_UP)
{
if(z!=2)
{
z=1;
check();
}
}
else if(e.getKeyCode()==KeyEvent.VK_DOWN)
{
if(z!=1)
{
z=2;
check();
}
}
else if(e.getKeyCode()==KeyEvent.VK_LEFT)
{
if(z!=4)
{
z=3;
check();
}
}
else if(e.getKeyCode()==KeyEvent.VK_RIGHT)
{
if(z!=3)
{
z=4;
check();
}
}
}
}
public void keyReleased(KeyEvent e)
{
}
public void keyTyped(KeyEvent e)
{
}
public void paint(Graphics g) {
g.setColor(Color.DARK_GRAY); //设置背景
g.fillRect(0,50,400,400);
g.setColor(Color.pink);
for(i=0;i=length-1;i++)
{
g.fillRect(m[i],n[i],10,10);
}
g.setColor(Color.green); //蛇的食物
g.fillRect(objectX,objectY,10,10);
g.setColor(Color.white);
g.drawString("当前 分数"+this.life,6,60);
g.drawString("当前已吃食物数"+this.foods,6,72);
}
}
package games;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import static java.lang.Math.*;//静态导入
/*
* 此类是贪吃蛇的简单实现方法
* 自己可以加入在开始时的设置，比如
* 选关，初始的蛇的长度等等
*/
public class Snake extends JPanel {
private static final long serialVersionUID = 1L;
private Direction dir;// 要走的方向
private int blockWidth = 10;// 块大小
private int blockSpace = 2;// 块之间的间隔
private long sleepTime;// 重画的进间间隔
private MySnake my;
private int total;// 代表蛇的长度
private Rectangle food;// 代表蛇的食物
private volatile boolean go;
private int round;// 表示第几关
public Snake(JFrame jf) {
initOther();
// 为顶级窗口类JFrame添加事件处理函数
jf.addKeyListener(new KeyAdapter() {
public void keyReleased(KeyEvent ke) {
int code = ke.getKeyCode();
if (code == KeyEvent.VK_RIGHT) {
if (dir != Direction.WEST)
dir = Direction.EAST;
}
else if (code == KeyEvent.VK_LEFT) {
if (dir != Direction.EAST)
dir = Direction.WEST;
}
else if (code == KeyEvent.VK_UP) {
if (dir != Direction.SOUTH)
dir = Direction.NORTH;
}
else if (code == KeyEvent.VK_DOWN) {
if (dir != Direction.NORTH)
dir = Direction.SOUTH;
} else if (code == KeyEvent.VK_ENTER) {
if (!go)
initOther();
}
}
});
this.setBounds(300, 300, 400, 400);
this.setVisible(true);
}
// 随机生成一个食物的位置
private void makeFood() {
int x = 40 + (int) (random() * 30) * 12;
int y = 10 + (int) (random() * 30) * 12;
food = new Rectangle(x, y, 10, 10);
}
// 做一些初始化的工作
private void initOther() {
dir = Direction.EAST;
sleepTime = 500;
my = new MySnake();
makeFood();
total = 3;
round = 1;
new Thread(new Runnable() {
public void run() {
go = true;
while (go) {
try {
Thread.sleep(sleepTime);
repaint();
} catch (Exception exe) {
exe.printStackTrace();
}
}
}
}).start();
}
// 处理多少关的函数
private void handleRound() {
if (total == 6) {
round = 2;
sleepTime = 300;
} else if (total == 10) {
round = 3;
sleepTime = 200;
} else if (total == 15) {
round = 4;
sleepTime = 100;
} else if (total == 18) {
round = 5;
sleepTime = 50;
} else if (total == 20) {
round = 6;
sleepTime = 20;
} else if (total 21) {
round = 7;
sleepTime = 15;
}
}
// 把自己的组件全部画出来
public void paintComponent(Graphics g) {
g.setColor(Color.PINK);
g.fillRect(0, 0, this.getWidth(), this.getHeight());
g.setColor(Color.BLACK);
g.drawRect(40, 10, 358, 360);
if (go) {
my.move();
my.draw(g);
g.setFont(new Font("黑体", Font.BOLD, 20));
g.drawString("您的得分：" + (total * 10) + " 第" + round + "关", 40,
400);
} else {
g.setFont(new Font("黑体", Font.BOLD, 20));
g.drawString("游戏结束,按回车(ENTER)键重玩！", 40, 440);
}
g.setColor(Color.RED);
g.fillRect(food.x, food.y, food.width, food.height);
}
private class MySnake {
private ArrayListRectangle list;
public MySnake() {
list = new ArrayListRectangle();
list.add(new Rectangle(160 + 24, 130, 10, 10));
list.add(new Rectangle(160 + 12, 130, 10, 10));
list.add(new Rectangle(160, 130, 10, 10));
}
// 蛇移动的方法
public void move() {
if (isDead()) {
go = false;
return;
}
if (dir == Direction.EAST) {
Rectangle rec = list.get(0);
Rectangle rec1 = new Rectangle(rec.x
+ (blockWidth + blockSpace), rec.y, rec.width,
rec.height);
list.add(0, rec1);
} else if (dir == Direction.WEST) {
Rectangle rec = list.get(0);
Rectangle rec1 = new Rectangle(rec.x
- (blockWidth + blockSpace), rec.y, rec.width,
rec.height);
list.add(0, rec1);
} else if (dir == Direction.NORTH) {
Rectangle rec = list.get(0);
Rectangle rec1 = new Rectangle(rec.x, rec.y
- (blockWidth + blockSpace), rec.width, rec.height);
list.add(0, rec1);
} else if (dir == Direction.SOUTH) {
Rectangle rec = list.get(0);
Rectangle rec1 = new Rectangle(rec.x, rec.y
+ (blockWidth + blockSpace), rec.width, rec.height);
list.add(0, rec1);
}
if (isEat()) {
handleRound();
makeFood();
} else {
list.remove(list.size() - 1);
}
}
// 判断是否吃到了食物
private boolean isEat() {
if (list.get(0).contains(food)) {
total++;
return true;
} else
return false;
}
// 判断是否死了，如果碰壁或者自己吃到自己都算死了
private boolean isDead() {
Rectangle temp = list.get(0);
if (dir == Direction.EAST) {
if (temp.x == 388)
return true;
else {
Rectangle comp = new Rectangle(temp.x + 12, temp.y, 10, 10);
for (Rectangle rec : list) {
if (rec.contains(comp))
return true;
}
}
return false;
} else if (dir == Direction.WEST) {
if (temp.x == 40)
return true;
else {
Rectangle comp = new Rectangle(temp.x - 12, temp.y, 10, 10);
for (Rectangle rec : list) {
if (rec.contains(comp))
return true;
}
}
return false;
} else if (dir == Direction.NORTH) {
if (temp.y == 10)
return true;
else {
Rectangle comp = new Rectangle(temp.x, temp.y - 12, 10, 10);
for (Rectangle rec : list) {
if (rec.contains(comp))
return true;
}
}
return false;
} else if (dir == Direction.SOUTH) {
if (temp.y == 358)
return true;
else {
Rectangle comp = new Rectangle(temp.x, temp.y + 12, 10, 10);
for (Rectangle rec : list) {
if (rec.contains(comp))
return true;
}
}
return false;
} else {
return false;
}
}
// 把自己画出来
public void draw(Graphics g) {
for (Rectangle rec : list) {
g.fillRect(rec.x, rec.y, rec.width, rec.height);
}
}
}
public static void main(String arsg[]) {
JFrame jf = new JFrame("贪吃蛇");
Snake s = new Snake(jf);
jf.getContentPane().add(s, BorderLayout.CENTER);
jf.setBounds(300, 300, 500, 500);
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
// 定义一个枚举，在此也可以用接口或者常量值代替
enum Direction {
EAST, SOUTH, WEST, NORTH;
}
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();
}
}