利用java 编写简易贪吃蛇游戏
贪吃蛇源码
程序共包含以下两个文件：
文件:ShellWin.java
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.*;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
@SuppressWarnings("serial")
public class ShellWin extends JPanel implements Runnable{ //实现了键盘与鼠标两个接口
int direction;
int length;
int score=0;
boolean control=false;
int[] xs=new int[400]; //蛇的个数，xy,坐标控制
int[] ys=new int[400];
int douX;int douY;
Thread thread;
public ShellWin()
{
setPreferredSize(new Dimension(600, 600));
setLocation(100, 100);
setBackground(Color.GREEN);
thread=new Thread(this); //为这个类添加一个线程
create_snake();
create_bean();
}
public void paintComponent(Graphics g) //绘制
{
super.paintComponent(g); //Jpanel内的方法，起到清屏的作用
g.drawString("分数:"+score, 50, 50);
g.drawRect(0,0, 600, 600);
show_snake(g);
show_bean(g);
}
//能不能吃豆，能不能死
void die()
{
JOptionPane.showMessageDialog(null, "game over", "游戏结束", JOptionPane.ERROR_MESSAGE);
}
void eat()
{
length++;
this.score+=100;
create_bean();
}
boolean out_bounds()
{
if(xs[0]==-10||xs[0]==600||ys[0]==-10||ys[0]==600) //出界即死
{
return true;
}
return false;
}
void change_direction(int new_direction) //控制方向
{
if(direction%2!=new_direction%2||direction==0) // 2 4 3 1 上下左右
{
direction=new_direction;
}
}
boolean eat_self()
{
for (int i = 1; i < length; i++) {
if(xs[0]==xs[i]&&ys[0]==ys[i])
{
return true;
}
}
return false;
}
boolean can_eat()
{
if(xs[0]==douX&&ys[0]==douY)
{
return true;
}
return false;
}
void create_snake()
{
direction=0;length=5;
for (int i = 0; i < length; i++) {
xs[i]=400;
ys[i]=400+10*i;
}
}
void create_bean()
{
douX=10*(int)(Math.random()*60);
douY=10*(int)(Math.random()*60);
for (int i = 0; i < length; i++) {
if(xs[i]==douX&&ys[i]==douY)
{
create_bean();
return;
}
}
}
void show_bean(Graphics g) //仍然得要写入到paintComponent方法内
{
g.setColor(Color.RED);
g.fillOval(douX, douY, 10, 10);
}
void crawl()
{
if(direction!=0)
for (int i = length-1; i >0; i--) { // 2 4 3 1 上下左右
xs[i]=xs[i-1]; //后一个替代前一个 4=3；
ys[i]=ys[i-1];
}
switch (direction) {
case 1:
xs[0]=xs[0]+10;
break;
case 2:
ys[0]=ys[0]-10;
break;
case 3:
xs[0]=xs[0]-10;
break;
case 4:
ys[0]=ys[0]+10;
break;
default:
break;
}
}
void show_snake(Graphics g)
{
for (int i = 0; i < length; i++) {
g.setColor(Color.BLUE);
if(i==0){
g.drawOval(xs[i], ys[i], 10, 10);
continue;
}
g.drawRect(xs[i], ys[i], 10, 10); //蛇的长度与大小
}
}
@Override
public void run() {
while(control)
{
try {
if(can_eat())
{
eat();
}
if(out_bounds())
{
die();
return;
}
if(eat_self())
{
die();
return;
}
crawl();
Thread.sleep(200);
repaint();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
class panel extends JPanel implements ActionListener,KeyListener{
JButton startGame=new JButton("开始");
JButton stopGame=new JButton("停止");
Box box1; //盒式布局
panel(){
setLayout(new FlowLayout());
box1=Box.createHorizontalBox();
box1.add(startGame);
box1.add(Box.createHorizontalStrut(2));
box1.add(stopGame);
setSize(800,800);
setBackground(Color.black);
addKeyListener(this); //为ShellWin 对象注册一个侦听器
startGame.addActionListener(this); //为开始按钮添加侦听器，this指代的是Actionistener这个类所创建的对象
stopGame.addActionListener(this); //为结束按钮添加侦听器，this指代的是Actionistener这个类所创建的对象
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==startGame)
{
this.requestFocus(); //将光标添加到该控件中
control=true;
thread.start(); //线程开始
//***********************************
this.repaint(100,100, 600, 600);
}
if(e.getSource()==stopGame)
{
this.requestFocus(); //将光标添加到该控件中
control=false; //线程结束
}
}
@Override
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_UP:
change_direction(2);
break;
case KeyEvent.VK_DOWN:
if(direction!=0)
change_direction(4);
break;
case KeyEvent.VK_LEFT:
change_direction(3);
break;
case KeyEvent.VK_RIGHT:
change_direction(1);
break;
default:
break;
}
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
}
}文件:ShellMain.java
import javax.swing.Box;
import javax.swing.JFrame;
@SuppressWarnings("serial")
public class ShellMain extends JFrame {
ShellWin win=new ShellWin();
ShellWin.panel pan=win.new panel();
Box box,box2;
ShellMain(){
box2=Box.createHorizontalBox();
box2.add(win);
box=Box.createVerticalBox();
box.add(pan.box1);
box.add(Box.createVerticalStrut(8));
box.add(box2);
pan.add(box);
setTitle("贪吃蛇");
setSize(800,800);
setVisible(true);
setLayout(null);
add(pan);
setLocation(0,0);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new ShellMain();
}
}