JAVA 学习日志 一个坦克游戏，关于数组对象、键盘监听、双缓冲、重写

import java.awt.Color;import java.awt.Frame;import java.awt.Graphics;import java.awt.Image;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;/** * 一个关于坦克的游戏，测试Frame、键盘监听、动画处理。 *  * @author冯世磊 *  */public class MyTankGame extends Frame {Image background=GameUnit.getImage("image/back.jpg");Image myTankImg=GameUnit.getImage("image/tank1.gif");ammo a[]=new ammo[100];Image ImageBuffer = null;Graphics GraImage = null;int x=400,y=260,n=0;//坦克初始坐标/** * 用于启动窗口的方法launchFrame */public void launchFrame() {setSize(900, 330);setLocation(100, 100);setTitle("坦克大逃亡 -作者：冯世磊");setVisible(true);for(int i=0;i<100;i++){a[i]=new ammo();}new PaintThread().start();//开启重画线程；addWindowListener(new WindowAdapter() { //监听关闭操作@Overridepublic void windowClosing(WindowEvent e) {System.exit(0);}//});this.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){System.out.println(e.getKeyCode());switch(e.getKeyCode()){case 37:{x-=5;myTankImg=GameUnit.getImage("image/tank1.gif");break;}  //leftcase 39:{x+=5;myTankImg=GameUnit.getImage("image/tank2.gif");break;}  //right}}});}public void update(Graphics g){//覆盖update方法，截取默认的调用过程ImageBuffer = createImage(this.getWidth(), this.getHeight());//创建图形缓冲区GraImage = ImageBuffer.getGraphics();//获取图形缓冲区的图形上下文paint(GraImage);//用paint方法中编写的绘图过程对图形缓冲区绘图GraImage.dispose();//释放图形上下文资源g.drawImage(ImageBuffer, 0, 0, this);//将图形缓冲区绘制到屏幕上}@Override// 重写paint类，用于在画面上重画图形public void paint(Graphics g) {g.drawImage(background, 0, 0, null);g.drawImage(myTankImg,x,y,null);a[n].show(g,a[n].b);a[n].run(3);if (n<10){n++;}else{n=0;}for(int i=0;i<100;i++){g.drawImage(a[n].b,a[n].x,a[n].y,null);}}public static void main(String[] args) {MyTankGame gf = new MyTankGame(); //建立一个坦克游戏对象gf.launchFrame();//开始画窗口}/** * 建立一个线程，用于实现重画Paint方法。 * @author Administrator * */class PaintThread extends Thread { // 为Paint方法建立一个线程public void run() {while (true) {repaint();// 重画try {Thread.sleep(40);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}//间隔40毫秒重画一次约每秒刷新25次}}}}

import java.awt.Graphics;import java.awt.Image;import java.awt.image.BufferedImage;import java.io.IOException;import java.net.URL;import java.math.*;import javax.imageio.ImageIO;public class GameUnit {/** *  * @param path URL路径 * @return 图片 */public static Image getImage(String path){URL u=GameUnit.class.getClassLoader().getResource(path);BufferedImage img=null;try {img=ImageIO.read(u);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}return img;}}/** * 炸弹的类 * @author Administrator * */class ammo{int x=0,y=10;Image b=GameUnit.getImage("image/ammo.gif");/** * 用来显示ammo * @param g 调用paint方法 */public void show(Graphics g,Image p){if (x==0){x=(int)(Math.random()*900);System.out.println(x);}//g.drawImage(p,x,y,null);}public void run(int speed){//下降if(y<=330) {y+=speed;}}}

炸弹想复制多个，为什么复制不了呢。建立了一个数组对象，但不管用，请高手给解释下