java小球碰撞窗體邊緣來回反彈的代碼

import?java.awt.Color;

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import?java.awt.Graphics;

import?java.awt.event.WindowAdapter;

import?java.awt.event.WindowEvent;

import?java.util.Random;

import?javax.swing.JFrame;

import?javax.swing.JPanel;

public?class?RunningBallDemo?extends?JFrame?{

public?static?void?main(String?args[])?{

new?RunningBallDemo();

}

public?RunningBallDemo()?{

Ball?ballPanel?=?new?Ball(5,?5);

getContentPane().add(ballPanel);

setBackground(Color.BLACK);

addWindowListener(new?WindowAdapter()?{

public?void?windowClosing(WindowEvent?e)?{

System.exit(0);

}

});

setSize(350,?350);

setVisible(true);

Thread?thread1?=?new?Thread(ballPanel);

thread1.start();

}

}

class?Ball?extends?JPanel?implements?Runnable?{

int?rgb?=?0;

Color?color;

int?x,?y;

int?dx?=?5,?dy?=?5;

Ball(int?x,?int?y)?{

this.x?=?x;

this.y?=?y;

}

@Override

protected?void?paintComponent(Graphics?g)?{

super.paintComponent(g);

setBackground(Color.BLACK);

g.setColor(color);

g.fillOval(x,?y,?50,?50);

}

public?void?run()?{

while?(true)?{

if?(x?=?0)?{

dx?=?5;

updateBallColor();

}?else?if?((x?+?50)?=?getWidth())?{

dx?=?-5;

updateBallColor();

}

if?(y?=?0)?{

dy?=?5;

updateBallColor();

}?else?if?((y?+?50)?=?getHeight())?{

dy?=?-5;

updateBallColor();

}

x?=?x?+?dx;

y?=?y?+?dy;

repaint();

try?{

Thread.sleep(25);

}?catch?(InterruptedException?e)?{

;

}

}

}

public?void?updateBallColor()?{

rgb?=?new?Random().nextInt();

color?=?new?Color(rgb);

}

}

JAVA做一個作業(yè)，制作一個window框里面有三個小球碰撞，碰到邊框或者小球變色加反彈，錯誤代碼求指點

沒辦法了 只能注冊一個馬甲了

import java.awt.*;

import java.awt.event.*;

import java.awt.Graphics;

public class yes {

public static void main(String args[])

{

Mywindow win=new Mywindow();

Ball qiu1=new Ball(5,5);

Thread thread1=new Thread(qiu1);

Ball qiu2=new Ball(10,5);

Thread thread2=new Thread(qiu2);

Ball qiu3=new Ball(15,5);

Thread thread3=new Thread(qiu3);

thread1.start();

thread2.start();

thread3.start();

}

}

class Mywindow extends Frame {

Mywindow (){

setSize(350,350);

setVisible(true);

setBackground(Color.BLACK);

validate();

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

System.exit(0);

}

});

}

}

class Ball extends Mywindow implements Runnable

{

int rgb=0;

Color color;

int x,y;

int dx=5,dy=5;

Ball(int x,int y){

this.x=x;

this.y=y;

}

public void doColor(){

rgb=(int)(Math.random()*0xFFFFFF);

color=new Color(rgb);

}

public void paint(Graphics g){

g.setColor(color);

g.fillOval(x,y,50,50);

}

public void run(){

while(true){

if(x=0) {dx=5;doColor();}

else if((x+50)=getWidth()) {dx=-5; doColor();}

if(y=0) {dy=5;doColor();}

else if((y+50)=getHeight()) {dy=-5; doColor();}

x=x+dx;

y=y+dy;

repaint();

try{Thread.sleep(50);}

catch(InterruptedException e) {;}

}

}

}

JAVA如何實現(xiàn)小球的彈性碰撞

我沒用java寫過代碼，所以我只說算法，代碼你自己翻譯下

按C的語法來：

void xiaoqiu

{

int UB=10,DB=200,LB=10,RB=200; //定義彈球范圍的邊界

int sh=1; //定義橫向步長

int sz=1; //定義縱向步長（兩步長之比決定了反彈的角度）

int x=LB,y=UB; //定義坐標

int i=10000; //循環(huán)次數(shù)（自己選擇跳出手段）

while(i0)

{

i--;

x=x+sh;

if(x=RB||x=LB) sh=-sh; //碰壁后步長變反

y=y+sz;

if(y=DB||y=UB) sz=-sz; //碰壁后步長變反

(顯示代碼)

}

return;

}

總得來說，就是相當于橫向和縱向分別處理移動、反彈的問題，碰壁后步長變?yōu)橄喾磾?shù)

不懂請追問

Eclipse 寫 java小程序。 6個小球碰撞反彈。我知道怎么碰壁反彈。我想要在碰撞過程中小球互相碰撞也反彈。

給小球類定義一個方法：碰撞；然后當周圍環(huán)境的坐標到球心的距離等于小球的半徑時，小球的運動路徑算法就應(yīng)該是軸對稱的。先判斷之前的運動方向，然后根據(jù)運動方向確定新的運動方向。這個其實就是線性方程做小球的運動軌跡而已。