13518219792
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);
}
}
没办法了 只能注册一个马甲了
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) {;}
}
}
}
我没用java写过代码，所以我只说算法，代码你自己翻译下
按C的语法来：
void xiaoqiu
{
int UB=10,DB=200,LB=10,RB=200; //定义弹球范围的边界
int sh=1; //定义横向步长
int sz=1; //定义纵向步长（两步长之比决定了反弹的角度）
int x=LB,y=UB; //定义坐标
int i=10000; //循环次数（自己选择跳出手段）
while(i0)
{
i--;
x=x+sh;
if(x=RB||x=LB) sh=-sh; //碰壁后步长变反
y=y+sz;
if(y=DB||y=UB) sz=-sz; //碰壁后步长变反
(显示代码)
}
return;
}
总得来说，就是相当于横向和纵向分别处理移动、反弹的问题，碰壁后步长变为相反数
不懂请追问
给小球类定义一个方法：碰撞；然后当周围环境的坐标到球心的距离等于小球的半径时，小球的运动路径算法就应该是轴对称的。先判断之前的运动方向，然后根据运动方向确定新的运动方向。这个其实就是线性方程做小球的运动轨迹而已。
