简单做了一个

import java.awt.borderlayout;

import java.awt.button;

import java.awt.color;

import java.awt.frame;

import java.awt.graphics;

import java.awt.panel;

import java.awt.point;

import java.awt.event.actionevent;

import java.awt.event.actionlistener;

import java.awt.event.windowadapter;

import java.awt.event.windowevent;

import java.awt.image.bufferedimage;

import java.util.arraylist;

import java.util.list;

public class myframe extends frame implements runnable,actionlistener{

double x1 = 100,y1 = 0;//a的起始位置

double x2 = 100,y2 = 0;//b的起始位置

double s2 = 26;//b的水平速度

double g = 9.8;//g

long time = 10000;//模拟10秒钟

double py = 1;//y轴比例尺

list list1 = new arraylist();

list list2 = new arraylist();

mpanel p1 = new mpanel();

button b1 = new button("启动");

thread t ;

public myframe(){

b1.addactionlistener(this);

this.add(b1,borderlayout.north);

this.add(p1,borderlayout.center);

this.setsize(800,600);

this.addwindowlistener(new windowadapter(){

public void windowclosing(windowevent e) {

system.exit(0);

}});

this.setvisible(true);

}

public void run(){

list1 = new arraylist();

list2 = new arraylist();

double xx1 = x1,yy1 = y1,xx2 = x2,yy2 = y2;//本时刻位置

long start = system.currenttimemillis();

long end = start;

while(end-start<=time){

end = system.currenttimemillis();

double t = (end - start)/1000.0;

yy1 = (y1 + g*t*t/2)*py;

xx2 = x1 + s2*t;

yy2 = (y2 + g*t*t/2)*py;

int sx1 = (int)xx1;

int sy1 = (int)yy1;

int sx2 = (int)xx2;

int sy2 = (int)yy2;

list1.add(new point(sx1,sy1));

list2.add(new point(sx2,sy2));

p1.repaint();

try {

thread.sleep(50);

} catch (interruptedexception e) {

e.printstacktrace();

}

}

}

public void actionperformed(actionevent e) {

if (t==null||!t.isalive()){

t = new thread(this);

t.start();

}

}

public class mpanel extends panel{

bufferedimage im = new bufferedimage(800,600,bufferedimage.type_int_rgb);

public void paint(graphics gg){

graphics g = im.getgraphics();

g.setcolor(color.white);

g.fillrect(0,0,800,600);

g.setcolor(color.blue);

point ppp1 = null;

point ppp2 = null;

for (int i=0;i

point pp1 = list1.get(i);

point pp2 = list2.get(i);

if (ppp1!=null&&ppp2!=null){

g.drawline(pp1.x,pp1.y,ppp1.x,ppp1.y);

g.drawline(pp2.x,pp2.y,ppp2.x,ppp2.y);

}

ppp1 = pp1;

ppp2 = pp2;

}

if (ppp1!=null&&ppp2!=null){

g.filloval(ppp1.x-5,ppp1.y-5,10,10);

g.filloval(ppp2.x-5,ppp2.y-5,10,10);

}

g.dispose();

gg.drawimage(im,0,0,800,600,p1);

}

}

public static void main(string[] args) {

new myframe();

}

}

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修改失败，请稍后尝试