求大神帮忙完善一个java小游戏，急急急！！！！

新手一个，请大神。。。。。

在下面程序下添加实现如下功能：

1.鼠标控制图片角色运动

2.触碰到界跌落

3。跌落后弹出对话框提示游戏结束

4.设置背景

5.设置背景音乐



import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.swing.*;

import javax.swing.border.Border;

class Ball {

int coodinateX, coodinateY, width, height, velocityX, velocityY;

Color color;

BufferedImage bimg;

JFrame jf;

public Ball(int cx, int cy, int w, int h, int vx, int vy, Color c,BufferedImage bimg,JFrame jf) {

coodinateX = cx;

coodinateY = cy;

width = w;

height = h;

velocityX = vx;

velocityY = vy;

color = c;

this.bimg=bimg;

this.jf=jf;

}

public void update() {

coodinateX = coodinateX + velocityX;

coodinateY = coodinateY + velocityY;

}

public void draw(Graphics g){

//g.setColor(color);

//g.fillOval(coodinateX, coodinateY, width, height);

g.drawImage(bimg,coodinateX,coodinateY,jf);

}

public void collide(int pW, int pH) {

if (coodinateX >= pW - width) {

// 判断是否撞上右边界

coodinateX = pW - width;

velocityX = -velocityX; // x速度变向

}

if (coodinateX <= 0) {// 判断是否撞上左边界

coodinateX = 0;

velocityX = -velocityX; // x速度变向

}

if (coodinateY >= pH - height) {// 判断是否撞上下边界

coodinateY = pH - height;

velocityY = -velocityY; // y速度变向

}

if (coodinateY <= 0) { // 判断是否撞到上边界

coodinateY = 0;

velocityY = -velocityY; // y速度变向

}

}

public boolean collide(Ball s) {

if (coodinateY + height <= s.coodinateY

&& coodinateY + height + velocityY >= s.coodinateY

+ s.velocityY) { // 判断当前精灵是否将要穿越s的上边界

if (coodinateX + width + velocityX >= s.coodinateX + s.velocityX

&& coodinateX + velocityX <= s.coodinateX + s.width

+ s.velocityX) { // 判断当前精灵是否将在s的x范围内

velocityY = -velocityY;

s.velocityY = -s.velocityY;

return true;

}

}

if (coodinateY >= s.coodinateY + s.height

&& coodinateY + velocityY <= s.coodinateY + s.height

+ s.velocityY) { // 判断当前精灵是否将要穿越s的下边界

if (coodinateX + width + velocityX >= s.coodinateX + s.velocityX

&& coodinateX + velocityX <= s.coodinateX + s.width

+ s.velocityX) { // 判断当前精灵是否将在s的x范围内

velocityY = -velocityY;

s.velocityY = -s.velocityY;

return true;

}

}

if (coodinateX + width <= s.coodinateX

&& coodinateX + width + velocityX > s.coodinateX + s.velocityX) { // 判断当前精灵是否将要穿越s的左边界

if (coodinateY + height + velocityY > s.coodinateY

&& coodinateY + velocityY < s.coodinateY + s.height

+ s.velocityY) { // 判断当前精灵是否将在s的y范围内

velocityX = -velocityX;

s.velocityX = -s.velocityX;

return true;

}

}

if (coodinateX >= s.coodinateX + s.width

&& coodinateX + velocityX < s.coodinateX + s.width

+ s.velocityX) { // 判断当前精灵是否将要穿越s的右边界

if (coodinateY + height + velocityY > s.coodinateY

&& coodinateY + velocityY < s.coodinateY + s.height

+ s.velocityY) { // 判断当前精灵是否将在s的y范围内

velocityX = -velocityX;

s.velocityX = -s.velocityX;

return true;

}

}

return false;

}

}



public class Animation extends JFrame implements ActionListener,KeyListener{

// private int x = 0, y = 0, dx = 0, dy = 0;

private Ball b1, b2;

private int interval = 20;

private int width, height;

private int cpWidth, cpHeight;

private Image offScreen;

private Graphics offScreenGraphics;

private MenuBar mb;

private Menu m1, m2;

private MenuItem mi1[] = new MenuItem[3], mi2[] = new MenuItem[3];

private boolean isRun = false;

private boolean first = true;

public Animation() {

File picture = new File("img/role.gif");

try {

BufferedImage sourceImg =ImageIO.read(new FileInputStream(picture));

b1=new Ball(10, 50, sourceImg.getWidth(),sourceImg.getHeight(), 10, 10, Color.red,sourceImg,this);

// g.drawImage(sourceImg,10, 10, this);

}

catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}





// b2=new Ball(400, 50, 50, 50, -10, 0, Color.blue);

width = 800;

height = 400;

mb = new MenuBar();

m1 = new Menu("控制");

m2 = new Menu("interval");

mb.add(m2 = new Menu("interval"));

mb.add(m1);

setMenuBar(mb);

m1.add(mi1[0] = new MenuItem("run"));

m1.add(mi1[1] = new MenuItem("stop"));

m1.add(mi1[2] = new MenuItem("exit"));

m2.add(mi2[0] = new MenuItem("20ms"));

m2.add(mi2[1] = new MenuItem("50ms"));

m2.add(mi2[2] = new MenuItem("100ms"));

mi1[0].addActionListener(this);

mi1[1].addActionListener(this);

mi1[2].addActionListener(this);

mi2[0].addActionListener(this);

mi2[1].addActionListener(this);

mi2[2].addActionListener(this);

addKeyListener(this);

setSize(width, height);



setVisible(true);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new Animation();

}

@Override

public void paint(Graphics g) {

// TODO Auto-generated method stub

if (first) {

super.paint(g);

first = false;

}



if (isRun) {

cpWidth = getContentPane().getWidth();

cpHeight = getContentPane().getHeight();

g = getContentPane().getGraphics();

g.setColor(Color.white);

g.fillRect(0, 0, cpWidth, cpHeight);

b1.draw(g);

// b2.draw(g);

try {

Thread.sleep(interval);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

b1.update();

// b2.update();

// b1.collide(b2);

b1.collide(cpWidth,cpHeight);

// b2.collide(cpWidth,cpHeight);

repaint();

}

}

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

if (e.getSource() == mi1[0]) {

if (isRun)

return;

else {

isRun = true;

repaint();

}

} else if (e.getSource() == mi1[1]) {

if (!isRun)

return;

else {

isRun = false;

repaint();

}

} else if (e.getSource() == mi1[2]) {

System.exit(0);

} else if (e.getSource() == mi2[0]) {

interval = 20;

repaint();

} else if (e.getSource() == mi2[1]) {

interval = 50;

repaint();

} else if (e.getSource() == mi2[2]) {

interval = 100;

repaint();

}

}

@Override

public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub

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

b1.coodinateX-=30;

repaint();

}

if(e.getKeyCode()==KeyEvent.VK_RIGHT){

b1.coodinateX+=30;

repaint();

}

if(e.getKeyCode()==KeyEvent.VK_UP){

b1.coodinateY-=30;

repaint();

}

if(e.getKeyCode()==KeyEvent.VK_DOWN){

b1.coodinateY+=30;

repaint();

}

}

@Override

public void keyReleased(KeyEvent e) {

// TODO Auto-generated method stub



}

@Override

public void keyTyped(KeyEvent e) {

// TODO Auto-generated method stub



}

}



角色图片