平抛,↑抛运动 ,竖抛

package gui;import java.awt.*;import java.awt.event.*;import javax.swing.*;/** * 编写一个Java GUI应用程序，采用Java多线程技术，有两个线程，模拟垂直上抛运动和水平抛体运动：一个球垂直上抛，一个球水平抛出。（本题30分）（垂直上抛物理公式：h=v0*t-g*t2/2 ；平抛运动物理公式：h=g*t*2/2 ，x=v*t ；h代表高度，v0代表初速度=30 m/s ，t代表时间，g代表重力加速度=9.8 m/s2 ，v代表平抛速度=30 m/s ）@start 2010-9-19 11:40 @end 12:20 * */public class Two_TwoBallTwo {public static void main(String[] args){TwoBallTwo ball=new TwoBallTwo();ball.init();ball.start();}}class TwoBallTwo extends JFrame{JRadioButton ball1=new JRadioButton();JRadioButton ball2=new JRadioButton();double g=9.8;double v0=30;double t=1;double t2=1;double t3=1;int width=800;int height=600;public void init(){this.getContentPane().add(ball1);this.getContentPane().add(ball2);ball1.setBounds(50, height/2,20,20);ball2.setBounds(5,10,20,20);ball1.setSelected(true);ball2.setSelected(true);this.validate();this.setVisible(true);this.setBounds(111, 111, 800, 600);}public void start(){//上 抛 --加修 正 Thread thread1=new Thread(){public void run(){while(true){//side area confirmif(Math.abs(ball1.getX())<width&&Math.abs(ball1.getY())<height){t3+=0.1;if(t<1){t+=0.1;}ball1.setBounds(ball1.getX(),(int)(ball1.getY()-(v0*t-g*t3*t3/2)), 20, 20);}else{try{this.sleep(1000);}catch(Exception e2){}t3=1;ball1.setBounds(50, height/2,20,20);t=1;}try{this.sleep(30);}catch(Exception e){}}}};//平 抛 --add修 正 Thread thread2=new Thread(){public void run(){while(true){//side area confirmif(Math.abs(ball2.getX())<width&&Math.abs(ball2.getY())<height){t2+=0.2;ball2.setBounds((int)(ball1.getX()*t2),(int)(g*t2*t2/2), 20, 20); }else{try{this.sleep(30);}catch(Exception e2){}t2=1;ball2.setBounds(5, 10,20,20);}try{this.sleep(30);}catch(Exception e){}}}};thread1.start();thread2.start();}}