java弹幕游戏+源代码 javagui弹窗

求java小游戏源代码

表1. CheckerDrag.java

// CheckerDrag.javaimport java.awt.*;import java.awt.event.*;public class CheckerDrag extends java.applet.Applet{ // Dimension of checkerboard square. // 棋盘上每个小方格java弹幕游戏+源代码的尺寸 final static int SQUAREDIM = 40; // Dimension of checkerboard -- includes black outline. // 棋盘的尺寸 – 包括黑色的轮廓线 final static int BOARDDIM = 8 * SQUAREDIM + 2; // Dimension of checker -- 3/4 the dimension of a square. // 棋子的尺寸 – 方格尺寸的3/4 final static int CHECKERDIM = 3 * SQUAREDIM / 4; // Square colors are dark green or white. // 方格的颜色为深绿色或者白色 final static Color darkGreen = new Color (0, 128, 0); // Dragging flag -- set to true when user presses mouse button over checker // and cleared to false when user releases mouse button. // 拖动标记 --当用户在棋子上按下鼠标按键时设为truejava弹幕游戏+源代码， // 释放鼠标按键时设为false boolean inDrag = false; // Left coordinate of checkerboard's upper-left corner. // 棋盘左上角的左方向坐标 int boardx; // Top coordinate of checkerboard's upper-left corner. //棋盘左上角的上方向坐标 int boardy; // Left coordinate of checker rectangle origin (upper-left corner). // 棋子矩形原点(左上角)的左方向坐标 int ox; // Top coordinate of checker rectangle origin (upper-left corner). // 棋子矩形原点(左上角)的上方向坐标 int oy; // Left displacement between mouse coordinates at time of press and checker // rectangle origin. // 在按键时的鼠标坐标与棋子矩形原点之间的左方向位移 int relx; // Top displacement between mouse coordinates at time of press and checker // rectangle origin. // 在按键时的鼠标坐标与棋子矩形原点之间的上方向位移 int rely; // Width of applet drawing area. // applet绘图区域的宽度 int width; // Height of applet drawing area. // applet绘图区域的高度 int height; // Image buffer. // 图像缓冲 Image imBuffer; // Graphics context associated with image buffer. // 图像缓冲相关联的图形背景 Graphics imG; public void init () { // Obtain the size of the applet's drawing area. // 获取applet绘图区域的尺寸 width = getSize ().width; height = getSize ().height; // Create image buffer. // 创建图像缓冲 imBuffer = createImage (width, height); // Retrieve graphics context associated with image buffer. // 取出图像缓冲相关联的图形背景 imG = imBuffer.getGraphics (); // Initialize checkerboard's origin, so that board is centered. // 初始化棋盘的原点java弹幕游戏+源代码，使棋盘在屏幕上居中 boardx = (width - BOARDDIM) / 2 + 1; boardy = (height - BOARDDIM) / 2 + 1; // Initialize checker's rectangle's starting origin so that checker is // centered in the square located in the top row and second column from // the left. // 初始化棋子矩形的起始原点，使得棋子在第一行左数第二列的方格里居中 ox = boardx + SQUAREDIM + (SQUAREDIM - CHECKERDIM) / 2 + 1; oy = boardy + (SQUAREDIM - CHECKERDIM) / 2 + 1; // Attach a mouse listener to the applet. That listener listens for // mouse-button press and mouse-button release events. // 向applet添加一个用来监听鼠标按键的按下和释放事件的鼠标监听器 addMouseListener (new MouseAdapter () { public void mousePressed (MouseEvent e) { // Obtain mouse coordinates at time of press. // 获取按键时的鼠标坐标 int x = e.getX (); int y = e.getY (); // If mouse is over draggable checker at time // of press (i.e., contains (x, y) returns // true), save distance between current mouse // coordinates and draggable checker origin // (which will always be positive) and set drag // flag to true (to indicate drag in progress). // 在按键时如果鼠标位于可拖动的棋子上方 // （也就是contains (x, y)返回true），则保存当前 // 鼠标坐标与棋子的原点之间的距离（始终为正值）并且 // 将拖动标志设为true（用来表明正处在拖动过程中） if (contains (x, y)) { relx = x - ox; rely = y - oy; inDrag = true; } } boolean contains (int x, int y) { // Calculate center of draggable checker. // 计算棋子的中心位置 int cox = ox + CHECKERDIM / 2; int coy = oy + CHECKERDIM / 2; // Return true if (x, y) locates with bounds // of draggable checker. CHECKERDIM / 2 is the // radius. // 如果(x, y)仍处于棋子范围内则返回true // CHECKERDIM / 2为半径 return (cox - x) * (cox - x) + (coy - y) * (coy - y) CHECKERDIM / 2 * CHECKERDIM / 2; } public void mouseReleased (MouseEvent e) { // When mouse is released, clear inDrag (to // indicate no drag in progress) if inDrag is // already set. // 当鼠标按键被释放时，如果inDrag已经为true， // 则将其置为false（用来表明不在拖动过程中） if (inDrag) inDrag = false; } }); // Attach a mouse motion listener to the applet. That listener listens // for mouse drag events. //向applet添加一个用来监听鼠标拖动事件的鼠标运动监听器 addMouseMotionListener (new MouseMotionAdapter () { public void mouseDragged (MouseEvent e) { if (inDrag) { // Calculate draggable checker's new // origin (the upper-left corner of // the checker rectangle). // 计算棋子新的原点（棋子矩形的左上角） int tmpox = e.getX () - relx; int tmpoy = e.getY () - rely; // If the checker is not being moved // (at least partly) off board, // assign the previously calculated // origin (tmpox, tmpoy) as the // permanent origin (ox, oy), and // redraw the display area (with the // draggable checker at the new // coordinates). // 如果棋子（至少是棋子的一部分）没有被 // 移出棋盘，则将之前计算的原点 // (tmpox, tmpoy)赋值给永久性的原点(ox, oy)， // 并且刷新显示区域（此时的棋子已经位于新坐标上） if (tmpox boardx tmpoy boardy tmpox + CHECKERDIM boardx + BOARDDIM tmpoy + CHECKERDIM boardy + BOARDDIM) { ox = tmpox; oy = tmpoy; repaint (); } } } }); } public void paint (Graphics g) { // Paint the checkerboard over which the checker will be dragged. // 在棋子将要被拖动的位置上绘制棋盘 paintCheckerBoard (imG, boardx, boardy); // Paint the checker that will be dragged. // 绘制即将被拖动的棋子 paintChecker (imG, ox, oy); // Draw contents of image buffer. // 绘制图像缓冲的内容 g.drawImage (imBuffer, 0, 0, this); } void paintChecker (Graphics g, int x, int y) { // Set checker shadow color. // 设置棋子阴影的颜色 g.setColor (Color.black); // Paint checker shadow. // 绘制棋子的阴影 g.fillOval (x, y, CHECKERDIM, CHECKERDIM); // Set checker color. // 设置棋子颜色 g.setColor (Color.red); // Paint checker. // 绘制棋子 g.fillOval (x, y, CHECKERDIM - CHECKERDIM / 13, CHECKERDIM - CHECKERDIM / 13); } void paintCheckerBoard (Graphics g, int x, int y) { // Paint checkerboard outline. // 绘制棋盘轮廓线 g.setColor (Color.black); g.drawRect (x, y, 8 * SQUAREDIM + 1, 8 * SQUAREDIM + 1); // Paint checkerboard. // 绘制棋盘 for (int row = 0; row 8; row++) { g.setColor (((row 1) != 0) ? darkGreen : Color.white); for (int col = 0; col 8; col++) { g.fillRect (x + 1 + col * SQUAREDIM, y + 1 + row * SQUAREDIM, SQUAREDIM, SQUAREDIM); g.setColor ((g.getColor () == darkGreen) ? Color.white : darkGreen); } } } // The AWT invokes the update() method in response to the repaint() method // calls that are made as a checker is dragged. The default implementation // of this method, which is inherited from the Container class, clears the // applet's drawing area to the background color prior to calling paint(). // This clearing followed by drawing causes flicker. CheckerDrag overrides // update() to prevent the background from being cleared, which eliminates // the flicker. // AWT调用java弹幕游戏+源代码了update()方法来响应拖动棋子时所调用的repaint()方法。该方法从 // Container类继承的默认实现会在调用paint()之前，将applet的绘图区域清除 // 为背景色，这种绘制之后的清除就导致了闪烁。CheckerDrag重写了update()来 // 防止背景被清除，从而消除了闪烁。 public void update (Graphics g) { paint (g); }}

相关问答

Q1: 求一个简单又有趣的JAVA小游戏代码

具体如下：

连连看的小源码

package Lianliankan;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class lianliankan implements ActionListener

{

JFrame mainFrame; //主面板

Container thisContainer;

JPanel centerPanel,southPanel,northPanel; //子面板

JButton diamondsButton[][] = new JButton[6][5];//游戏按钮数组

JButton exitButton,resetButton,newlyButton; //退出，重列，重新开始按钮

JLabel fractionLable=new JLabel("0"); //分数标签

JButton firstButton,secondButton; //

分别记录两次62616964757a686964616fe59b9ee7ad9431333335326239被选中的按钮

int grid[][] = new int[8][7];//储存游戏按钮位置

static boolean pressInformation=false; //判断是否有按钮被选中

int x0=0,y0=0,x=0,y=0,fristMsg=0,secondMsg=0,validateLV; //游戏按钮的位置坐标

int i,j,k,n;//消除方法控制

代码（code）是程序员用开发工具所支持的语言写出来的源文件，是一组由字符、符号或信号码元以离散形式表示信息的明确的规则体系。

对于字符和Unicode数据的位模式的定义，此模式代表特定字母、数字或符号（例如 0x20 代表一个空格，而 0x74 代表字符“t”）。一些数据类型每个字符使用一个字节；每个字节可以具有 256 个不同的位模式中的一个模式。

在计算机中，字符由不同的位模式（ON 或 OFF）表示。每个字节有 8 位，这 8 位可以有 256 种不同的 ON 和 OFF 组合模式。对于使用 1 个字节存储每个字符的程序，通过给每个位模式指派字符可表示最多 256 个不同的字符。2 个字节有 16 位，这 16 位可以有 65,536 种唯一的 ON 和 OFF 组合模式。使用 2 个字节表示每个字符的程序可表示最多 65,536 个字符。

单字节代码页是字符定义，这些字符映射到每个字节可能有的 256 种位模式中的每一种。代码页定义大小写字符、数字、符号以及 !、@、#、% 等特殊字符的位模式。每种欧洲语言（如德语和西班牙语）都有各自的单字节代码页。

虽然用于表示 A 到 Z 拉丁字母表字符的位模式在所有的代码页中都相同，但用于表示重音字符（如"é"和"á"）的位模式在不同的代码页中却不同。如果在运行不同代码页的计算机间交换数据，必须将所有字符数据由发送计算机的代码页转换为接收计算机的代码页。如果源数据中的扩展字符在接收计算机的代码页中未定义，那么数据将丢失。

如果某个数据库为来自许多不同国家的客户端提供服务，则很难为该数据库选择这样一种代码页，使其包括所有客户端计算机所需的全部扩展字符。而且，在代码页间不停地转换需要花费大量的处理时间。

Q2: 用java web小游戏源代码。期末结课老师让做，急用，谢了

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.Toolkit;

import javax.swing.JFrame;

@SuppressWarnings("serial")

public class MainClass extends JFrame {

ControlSnake control;

Toolkit kit;

Dimension dimen;

public static void main(String[] args) {

new MainClass("my snake");

}

public MainClass(String s) {

super(s);

control = new ControlSnake();

control.setFocusable(true);

kit = Toolkit.getDefaultToolkit();

dimen = kit.getScreenSize();

add(control);

setLayout(new BorderLayout());

setLocation(dimen.width / 3, dimen.height / 3);// dimen.width/3,dimen.height/3

setSize(FWIDTH, FHEIGHT);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setResizable(false);

setVisible(true);

}

public static final int FWIDTH = 315;

public static final int FHEIGHT = 380;

}

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Point;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.util.ArrayList;

import java.util.Random;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.Timer;

@SuppressWarnings("serial")

public class ControlSnake extends JPanel implements ActionListener {

Random rand;

ArrayListPoint list, listBody;

String str, str1;

static boolean key;

int x, y, dx, dy, fx, fy, flag;

int snakeBody;

int speed;

public ControlSnake() {

snakeBody = 1;

str = "上下左右方向键控制 P键暂停...";

str1 = "现在java弹幕游戏+源代码的长度为:" + snakeBody;

key = true;

flag = 1;

speed = 700;

rand = new Random();

list = new ArrayListPoint();

listBody = new ArrayListPoint();

x = 5;

y = 5;

list.add(new Point(x, y));

listBody.add(list.get(0));

dx = 10;

dy = 0;

fx = rand.nextInt(30) * 10 + 5;// 2

fy = rand.nextInt(30) * 10 + 5;// 2

setBackground(Color.BLACK);

setSize(new Dimension(318, 380));

final Timer time = new Timer(speed, this);

time.start();

addKeyListener(new KeyAdapter(){

public void keyPressed(KeyEvent e) {

if (e.getKeyCode() == 37) {

dx = -10;

dy = 0;

} else if (e.getKeyCode() == 38) {

dx = 0;

dy = -10;

} else if (e.getKeyCode() == 39) {

dx = 10;

dy = 0;

} else if (e.getKeyCode() == 40) {

dx = 0;

dy = 10;

} else if (e.getKeyCode() == 80) {

if (flag % 2 == 1) {

time.stop();

}

if (flag % 2 == 0) {

time.start();

}

flag++;

}

}

});

}

public void paint(Graphics g) {

g.setColor(Color.WHITE);

g.fillRect(0, 0, 400, 400);

g.setColor(Color.DARK_GRAY);

g.drawLine(3, 3, 305, 3);

g.drawLine(3, 3, 3, 305);

g.drawLine(305, 3, 305, 305);

g.drawLine(3, 305, 305, 305);

g.setColor(Color.PINK);

for (int i = 0; i listBody.size(); i++) {

g.fillRect(listBody.get(i).x, listBody.get(i).y, 9, 9);

}

g.fillRect(x, y, 9, 9);

g.setColor(Color.ORANGE);

g.fillRect(fx, fy, 9, 9);

g.setColor(Color.DARK_GRAY);

str1 = "现在java弹幕游戏+源代码的长度为:" + snakeBody;

g.drawString(str, 10, 320);

g.drawString(str1, 10, 335);

}

public void actionPerformed(ActionEvent e) {

x += dx;

y += dy;

if (makeOut() == false) {

JOptionPane.showMessageDialog(null, "重新开始......");

speed = 700;

snakeBody = 1;

x = 5;

y = 5;

list.clear();

list.add(new Point(x, y));

listBody.clear();

listBody.add(list.get(0));

dx = 10;

dy = 0;

}

addPoint(x, y);

if (x == fx y == fy) {

speed = (int) (speed * 0.8);//速度增加参数

if (speed 200) {

speed = 100;

}

fx = rand.nextInt(30) * 10 + 5;// 2

fy = rand.nextInt(30) * 10 + 5;// 2

snakeBody++;// 2

} // 2

repaint();

}

public void addPoint(int xx, int yy) {

// 动态的记录最新发生的50步以内的移动过的坐标

// 并画出最新的snakeBody

if (list.size() 100) {//蛇身长度最长为100

list.add(new Point(xx, yy));

} else {

list.remove(0);

list.add(new Point(xx, yy));

}

if (snakeBody == 1) {

listBody.remove(0);

listBody.add(0, list.get(list.size() - 1));

} else {

listBody.clear();

if (list.size() snakeBody) {

for (int i = list.size() - 1; i 0; i--) {

listBody.add(list.get(i));

}

} else {

for (int i = list.size() - 1; listBody.size() snakeBody; i--) {

listBody.add(list.get(i));

}

}

}

}

public boolean makeOut() {

if ((x 3 || y 3) || (x 305 || y 305)) {

return false;

}

for (int i = 0; i listBody.size() - 1; i++) {

for (int j = i + 1; j listBody.size(); j++) {

if (listBody.get(i).equals(listBody.get(j))) {

return false;

}

}

}

return true;

}

}

/*贪吃蛇代码*/

Q3: 求解答以下的java源代码，详细点，说明这个程序的设计思路，还有比如运用了多线程的话运用了多线程的什么

import java.awt.*;

import java.awt.event.*;

import java.util.Random;

import javax.swing.Timer;

public class PinBall

{

private final int TABLE_WIDTH = 300;//桌面宽度

private final int TABLE_HEIGHT = 400;//桌面高度

private final int RACKET_Y = 340;//球拍的垂直位置

private final int RACKET_HEIGHT = 20;//球拍高度

private final int RACKET_WIDTH = 60;//球拍宽度

private final int BALL_SIZE = 16;//球的大小

private Frame f = new Frame("弹球游戏");//实例化一个窗口

Random rand = new Random();//实例化一个随机数生成器

private int ySpeed = 10;//小球的纵向运动数度、

private double xyRate = rand.nextDouble() - 0.5;//返回一个-0.5到0.5之间的比率用控制小球运动方向

private int xSpeed = (int)(ySpeed*xyRate*2);//这个横向速度在-10到10之间，产生左右摆动运动效果

private int ballX = rand.nextInt(200)+20;//小球开始的横坐标位置，200表示产生0到100之间的随机数

private int ballY = rand.nextInt(10)+20;//小球开始的纵坐标位置

private int racketX = rand.nextInt(200);//球拍开始时的横坐标位置

private MyCanvas tableArea = new MyCanvas();//实力化一个画布工具，集成Canvas类

private String shape = "";//保存需要绘制图形的字符串属性

Timer timer;//声明一个时间变量

private boolean isLose = false;//表示游戏是否结束

public void init()

{

tableArea.setPreferredSize(new Dimension(TABLE_WIDTH,TABLE_HEIGHT));//定义画布大小

f.add(tableArea);//添加画布到窗口

KeyAdapter keyProcessor = new KeyAdapter()//实例化一个键盘监听事件适配器

{

public void keyPressed(KeyEvent ke)//重写适配器里面的按下某键盘方法

{

if(ke.getKeyCode()==KeyEvent.VK_LEFT)//按下键盘左键时

{

if(racketX 0)//球拍左边框不能出画布的左边框

racketX -=10;//按一左键次向左移动10个像素

}

if(ke.getKeyCode()==KeyEvent.VK_RIGHT)//按下键盘右键时

{

if(racketX TABLE_WIDTH - RACKET_WIDTH)//球拍右边框不能出画布的右边框

racketX +=10;//按一次右键移动向右移动10个像素

}

}

};

f.addKeyListener(keyProcessor);//给窗口添加键盘监听器

tableArea.addKeyListener(keyProcessor);//给画布添加键盘监听器

ActionListener taskPerformer = new ActionListener()//这里是实例化了一个监听接口，这个接口里面只有一个方法

{

public void actionPerformed(ActionEvent evt)//重写这个接口里面的方法，判断小球的位置

{

if(ballX=0 || ballX=TABLE_WIDTH-BALL_SIZE)//保证小球横向上在画布之内运动

{

xSpeed = -xSpeed;//触发反方向运动

}

if(ballY=RACKET_Y-BALL_SIZE(ballXracketX||ballXracketX+RACKET_WIDTH))//出了球拍的可击打范围

{

timer.stop();//停止对监听器的触发

isLose=true;//将标志isLose变量置为true

tableArea.repaint();//调用画布的重绘方法

}

else if(ballY=0||(ballY=RACKET_Y-BALL_SIZEballYracketXballX=racketX+RACKET_WIDTH))//小球在球拍之内，而其到达球拍的高度

{

ySpeed=-ySpeed;//上下方向改变，小球反弹

}

ballY+=ySpeed;//小球的坐标在纵向上增加

ballX+=xSpeed;//小球的坐标在横向上的增加

tableArea.repaint();//调用画布的重绘方法3

}

};

timer = new Timer(100,taskPerformer);//每隔0.1秒运行一次监听器

timer.start();//计时器开始运行

f.addWindowListener(new MyListener());//关闭窗口事件

f.pack();//设置窗口最佳大小

f.setVisible(true);//显示窗口

}

class MyListener extends WindowAdapter//关闭窗口的类

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

}

public static void main(String[] args)//程序入口

{

new PinBall().init();//调用PinBall类里面的init()方法

}

class MyCanvas extends Canvas//建一个集成Canvas类的类

{

public void paint(Graphics g)//重写父类的绘图方法

{

if(isLose)//如果isLose为真，则在画布里打印“游戏已结束”

{

g.setColor(new Color(255,0,0));//当前颜色

g.setFont(new Font("黑体",Font.BOLD,30));//字体名称，样式，大小

g.drawString("游戏已结束！",50,200);//按坐标绘制文字图形

}

else//负责

{

g.setColor(new Color(240,240,80));//当前颜色

g.fillOval(ballX,ballY,BALL_SIZE,BALL_SIZE);//填充颜色，根据坐标和长宽填充圆形

g.setColor(new Color(80,80,200));//当前颜色

g.fillRect(racketX,RACKET_Y,RACKET_WIDTH,RACKET_HEIGHT);//填充颜色，根据坐标和长宽填充矩形

}

}

}

}

Q4: 跪求JAVA编写的小游戏源代码

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

import java.awt.image.*;

import java.awt.geom.*;

import java.util.*;

class Car{

Image img;

int x, y;

Dimension dim;

Car(Image img){

this.img=img;

}

Car(Image img, int x, int y){

this.img=img; this.x=x; this.y=y;

}

Car(Image img, int x, int y, Dimension dim){

this(img, x, y);

this.dim=dim;

}

void draw(Graphics g, ImageObserver observer){

g.drawImage(img, x, y, observer);

}

int getX(){ return x;}

int getY(){ return y;}

void setX(int x){this.x=x;}

void setY(int y){this.y=y;}

void setLocation(int x, int y){

this.x=x; this.y=y;

}

int getWidth(){ return img.getWidth(null);}

int getHeight(){ return img.getHeight(null);}

Rectangle2D getRectangle(){

return new Rectangle2D.Float(x, y, getWidth(), getHeight());

}

void move(int dx, int dy){

x+=dx;

y+=dy;

if(dim!=null){

if(x0)x=0;

if(x+getWidth()dim.getWidth())

x=(int)dim.getWidth()-getWidth();

}

}

boolean intersects(Car car){

return getRectangle().intersects(car.getRectangle());

}

boolean intersects(int x, int y){

return getRectangle().intersects(x, y, getWidth(), getHeight());

}

}

public class CarRace extends Applet implements KeyListener, Runnable{

Image buff;

Canvas screen;

Graphics2D gs, gb;

Car redCar;

Car[] enemy=new Car[20];

Button bStart;

Thread game;

boolean loop=true;

Dimension dim=new Dimension(200, 300);

int road;

Random rnd=new Random();

public void init(){

prepareResource();

setBackground(Color.blue);

initScreen();

add(screen);

bStart=new Button("霸烙 矫累");

add(bStart);

bStart.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent ae){

screen.requestFocus();

if(!game.isAlive())

game.start();

}

});

}

void prepareResource(){

Image imgRed=getImage(getCodeBase(),"images/red_car.gif");

Image imgBlue=getImage(getCodeBase(),"images/blue_car.gif");

Image imgGreen=getImage(getCodeBase(),"images/green_car.gif");

MediaTracker mt=new MediaTracker(this);

try{

mt.addImage(imgRed, 0);

mt.addImage(imgBlue, 1);

mt.addImage(imgGreen, 2);

mt.waitForAll();

}catch(Exception e){}

buff=createImage((int)dim.getWidth(), (int)dim.getHeight());

gb=(Graphics2D)buff.getGraphics();

redCar=new Car(imgRed, 80,250, dim);

for(int i=0;i10;i++){

enemy[i]=new Car(imgBlue, 0, 0);

}

for(int i=10;ienemy.length;i++){

enemy[i]=new Car(imgGreen, 0, 0);

}

for(int i=0;ienemy.length;i++){

setEnemy(i);

}

game=new Thread(this);

}

public void stop(){

loop=false;

}

public void run(){

while(loop){

drawScreen();

try{ Thread.sleep(50);}catch(Exception e){}

}

}

void initScreen(){

screen=new Canvas(){

public void paint(Graphics g){

if(gs==null){

gs=(Graphics2D)screen.getGraphics();

}

drawScreen();

}

};

screen.setSize(dim);

screen.addKeyListener(this);

}

void setEnemy(int en){

int x, y;

next:while(true){

x=rnd.nextInt((int)dim.getWidth()-enemy[en].getWidth());

y=-rnd.nextInt(5000)-200;

for(int j=0;jenemy.length;j++){

if(j!=en enemy[j].intersects(x, y))continue next;

}

enemy[en].setLocation(x, y);

break;

}

}

void check(Car en){

if(redCar.intersects(en)){

if(redCar.getX()en.getX()){

en.move(-20, 0);

redCar.move(20, 0);

}

else{

en.move(20,0);

redCar.move(-20, 0);

}

}

}

synchronized void drawScreen(){

gb.clearRect(0, 0, (int)dim.getWidth(), (int)dim.getHeight());

gb.setPaint(new Color(100, 100, 100));

gb.fillRect(0, 0, (int)dim.getWidth(), (int)dim.getHeight());

drawRoad();

for(int i=0;ienemy.length;i++){

enemy[i].move(0, 15);

enemy[i].draw(gb, screen);

if(enemy[i].getY()dim.getHeight())

setEnemy(i);

check(enemy[i]);

}

redCar.draw(gb, screen);

gs.drawImage(buff, 0,0, screen);

}

void drawRoad(){

road+=80;

gb.setPaint(Color.yellow);

gb.fillRect((int)dim.getWidth()/2, road,10,150);

if(road=dim.getHeight())road=-150;

}

public void keyPressed(KeyEvent ke){

if(ke.getKeyCode()==KeyEvent.VK_LEFT){

redCar.move(-10,0);

}

else if(ke.getKeyCode()==KeyEvent.VK_RIGHT){

redCar.move(10,0);

}

}

public void keyReleased(KeyEvent ke){}

public void keyTyped(KeyEvent ke){}

}

这个是一个典型的Applet,文件名应该是CarRace.java,需要图片作为车子等等,本人也是别人给的,但是还要个.html文件来运行它,代码为:

Applet code="CarRace.class" width=250 height=350

/Applet

请楼主采纳

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