J2ME 小游戏（多线程操作示例）

import javax.microedition.lcdui.Canvas; import javax.microedition.lcdui.Graphics; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.*; import java.util.*; import javax.microedition.midlet.*; import javax.microedition.lcdui.Command; import javax.microedition.midlet.MIDlet; import javax.microedition.lcdui.CommandListener; class carG extends Canvas implements Runnable { private boolean isRunning; private int carX;//车的X坐标 private int carY;//车的Y坐标 private int[] X; private int[] Y; private int startBoundry; private int endBoundry; private int middleBoundry; private int interval;//障碍之间间隔 private int score;//得分 private int sleepTime;//线程睡眠时间 public int getX() { Random rand = new Random(); return Math.abs(rand.nextInt() % 2) == 0 ? startBoundry : middleBoundry; } public int getInterval() { Random rand = new Random(); return Math.abs(rand.nextInt() % 50); } public void startToRun() { interval = this.getInterval(); score = 0; startBoundry = getWidth() / 2 - 20; middleBoundry = getWidth() / 2; endBoundry = getWidth() / 2 + 20; carX = startBoundry; carY = getHeight() - 25; X = new int[2]; Y = new int[2]; for(int i = 0;i < 2; i++) { X[i] = i % 2 == 0 ? startBoundry : middleBoundry; } for(int i = 0;i < 2;i ++) { Y[i] = 60 * i; } isRunning = true; Thread t = new Thread(this); t.start(); } public void start() { Thread t = new Thread(this); t.start(); } public carG() { this.startToRun(); } public void paint(Graphics g) { if((Math.abs(X[0] - carX) < 20 && Math.abs(Y[0] - carY) < 20) || (Math.abs(X[1] - carX) < 20 && Math.abs(Y[1] - carY) < 20))//输了 { g.setColor(0x0000ff); g.drawString("it's a pity!!loser!",startBoundry - 40,middleBoundry - 50,0); isRunning = false; } if(score == 5000) { g.setColor(0x00000f); g.drawString("congratulations!winner!",startBoundry - 40,middleBoundry - 50,0); isRunning = false; } //刷新 g.setColor(0xffffff); g.fillRect(0,0,getWidth(),getHeight()); //画出边界 g.setColor(0x00ffff); g.drawRect(startBoundry,0,40,getHeight()); //画车 g.setColor(0x0fffff); g.fillRoundRect(carX, carY, 20, 25, 10,10); g.setColor(255,255,1); g.drawString("囧",carX + 4,carY + 6,0); g.fillRect(carX + 2,carY + 2,4,1); g.fillRect(carX + 12,carY + 2,4,1); //画其他车 for(int i = 0;i < 2; i++) { g.setColor(0x000fff); g.fillRoundRect(X[i],Y[i],20,25,10,10); g.setColor(255,255,0); g.fillRect(X[i] + 2,Y[i] + 4,4,1); g.fillRect(X[i] + 12,Y[i] + 4,4,1 ); g.drawString("囧",X[i] + 4,Y[i] + 6,0); } //车前进的效果 for(int i = 0;i < 2; i++) { Y[i] += 5; } //产生新障碍车 if(Y[1] >= getHeight()) { X[1] = X[0]; Y[1] = Y[0]; X[0] = this.getX(); Y[0] = 0; } //画新障碍车组 for(int i = 0;i < 2 ;i++) { g.setColor(0x000fff); g.fillRoundRect(X[i],Y[i],20,25,10,10); g.setColor(255,255,0); g.fillRect(X[i] + 2,Y[i] + 4,4,1); g.fillRect(X[i] + 12,Y[i] + 4,4,1 ); g.drawString("囧",X[i] + 4,Y[i] + 6,0); } //显示记分牌 g.setColor(0x0000ff); g.drawString("score:",startBoundry - 40,middleBoundry - 30,0); g.drawString(String.valueOf(score),startBoundry - 20, middleBoundry - 20, 0); } public void run() { try { while(isRunning) { repaint(); switch(score) { case 0: sleepTime = 100; break; case 1000: sleepTime = 80; break; case 2000: sleepTime = 60; break; case 3000: sleepTime = 40; break; case 4000: sleepTime = 20; break; case 4500: sleepTime = 10; default: break; } score++; Thread.sleep(sleepTime); } } catch(Exception e) { System.out.println("error!"); e.printStackTrace(); } } public void keyPressed(int code) { if(getGameAction(code) == LEFT || code == '4') { if(carX > startBoundry) carX -= 20; } else if(getGameAction(code) == RIGHT || code == '6') { if(carX < endBoundry - 20) carX += 20; } else if(getGameAction(code) == UP || code == '2') { if(carY > 25) carY -= 10; } else if(getGameAction(code) == DOWN || code == '8') { if(carY < getHeight() - 25) carY += 10; } } } public class carUtil extends MIDlet { public void startApp() { Display.getDisplay(this).setCurrent(new carG()); } public void pauseApp(){} public void destroyApp(boolean b){} }