java代码画一个小球,java小球运动代码

关于类的,写一个球的体积的java代码

import java.util.Scanner;

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/**

* 计算球的体积

* @author young

*

*/

public class Volume {

public static void main(String[] args) {

System.out.print("请输入r:");

Scanner reader = new Scanner(System.in);

double r = 0, v = 0;

r = reader.nextDouble();

v = 4 * 3.14159 / 3 * r * r * r;

System.out.println("球体积为:" + String.format("%.2f", v));

}

}

滚动的小球 java源代码

//Checkers.java

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

//Checkers类

public class Checkers extends JFrame implements ActionListener {

//变量定义

CheckersPanel checkers = new CheckersPanel();

JButton startButton = new JButton("start");

JButton stopButton = new JButton("stop");

//构造函数

public Checkers(){

super("Checkers");

setSize(210,170);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanel pane = new JPanel();

BorderLayout border = new BorderLayout();

pane.setLayout(border);

pane.add(checkers,"Center");

JPanel buttonPanel = new JPanel();

startButton.addActionListener(this);

buttonPanel.add(startButton);

stopButton.addActionListener(this);

stopButton.setEnabled(false);

buttonPanel.add(stopButton);

pane.add(buttonPanel,"South");

setContentPane(pane);

show();

}

//响应用户动作

public void actionPerformed(ActionEvent evt){

if(evt.getSource() == startButton){

checkers.playAnimation();

startButton.setEnabled(false);

stopButton.setEnabled(true);

}else{

checkers.stopAnimation();

startButton.setEnabled(true);

stopButton.setEnabled(false);

}

}

//主函数

public static void main(String[] arguments){

Checkers ck = new Checkers();

}

}

//CheckersPanel类

class CheckersPanel extends JPanel implements Runnable{

//变量定义

private Thread runner;

int xPos = 5;

int xMove = 4;

//播放动画

void playAnimation(){

if (runner ==null);{

runner = new Thread(this);

runner.start();

}

}

//停止动画

void stopAnimation(){

if (runner !=null);{

runner = null;

}

}

//运行

public void run(){

Thread thisThread = Thread.currentThread();

while(runner ==thisThread){

xPos += xMove;

if ((xPos 105)|(xPos 5))

xMove *= -1;

repaint();

try{

Thread.sleep(100);

}catch(InterruptedException e){}

}

}

//画图形

public void paintComponent(Graphics comp){

Graphics2D comp2D = (Graphics2D)comp;

comp2D.setColor(Color.blue);

comp2D.fillRect(0,0,100,100);

comp2D.setColor(Color.white);

comp2D.fillRect(100,0,100,100);

comp2D.setColor(Color.black);

comp2D.fillOval(xPos,5,90,90);

}

}

在Java中如何用程序画一个圆

使用java画圆要用到绘图类Graphics,下面是实例代码和运行效果:

package com.dikea.demo01;

import java.awt.*;

import javax.swing.*;

// java绘图原理

public class demo_01  extends JFrame {

MyPanel mp = null;

public static void main(String[] args) {

// TODO 自动生成的方法存根

demo_01 demo01 = new demo_01();

}

public demo_01(){

mp = new MyPanel();

this.add(mp);

this.setSize(400, 300);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

}

// 定义一个MyPanel面板,用于绘图区域

class MyPanel extends JPanel{

//覆盖JPanel

// Graphics 是绘图的重要类,可以理解成一支画笔

public void paint(Graphics g){

//  1. 调用父类函数完成初始化任务

//  这句话不可以少

super.paint(g);

// 先画出一个圆圈

g.drawOval(100, 100, 30, 30);

}

}

代码复制进ide编程工具,运行效果如下:

[急]求java小程序:绘制一个小球模拟平抛运动

;

可以这样写:

import javax.swing.*;

import java.awt.*;

class C extends JFrame {

C() {

final Point point = new Point();

add(new JPanel() {

public void paintComponent(Graphics g) {

g.fillOval(point.x, point.y, 20, 20);

point.x = (point.x + 2) % getWidth();

point.y = (point.x * point.x) / 1000;   // 造就弧线的简单二次方程。

}

});

setSize(777, 666);

setVisible(true);

setDefaultCloseOperation(EXIT_ON_CLOSE);

while (true) {

repaint(point.x, point.y, 50, 50);

try { Thread.sleep(10); } catch (Exception ex) {}

}

}

public static void main(String[] args) {

new C();

}

}

JAVA 编辑 小球在一个框里做连续的碰撞运动

/*

* 一个在窗体中来回运动的圆.java

*

* Created on 2005年10月5日, 下午1:02

*

* To change this template, choose Tools | Options and locate the template under

* the Source Creation and Management node. Right-click the template and choose

* Open. You can then make changes to the template in the Source Editor.

*/

package javaapplication1;

import java.applet.Applet;

import a href=";tn=44039180_cprfenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y3uhPWrjRdmHTdmWR4nWn40ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPHRYnHmYnHRYPW6knH63P1nz" target="_blank" class="baidu-highlight"java.awt.Color/a;

import java.awt.Event;

import java.awt.Graphics;

import java.applet.*;

import java.awt.*;

import java.math.*;

/**

*

* @author Bachelorlrz

*/

public class 在窗体中来回运动的圆 extends java.applet.Applet implements java.lang.Runnable {

int cx,cy,c1x,c1y;    //圆的坐标

int cw,ch;            //圆的宽高

int bx,by,bw,bh;      //背景的坐标和宽高

int dx,dx1;           //圆的运动

int r,rx,ry;          //圆的半径和位置 

int r1,r1x,r1y;

Thread u_thread;

/** Initialization method that will be called after the applet is loaded

*  into the browser.

*/

public void init() {

rx=150;             ry=160;

bw=500;             bh=400;

r1x=bw/2-cw*2;        r1y=bh/2-ch;

r=60;               r1=200;

cx =rx;             cy =ry;

c1x=r1x;            c1y=r1y;

cw=30;              ch=30;

bx=2;               by=2;

dx=1;               dx1=2;         

// TODO start asynchronous download of heavy resources

}

// TODO overwrite start(), stop() and destroy() methods

public void update(java.awt.Graphics g) {

super.paint(g);

g.setColor(Color.red);

g.drawRect(bx,by,bw,bh);

g.setColor(Color.BLACK);

g.fillRect(bx+2,by+2,bw-4,bh-4);

g.drawString("在窗体中来回运动的圆", bw/2-60, bh/2);

if (cxrx-r  || cxrx+r) {

dx = -dx;  

}

if (c1xr1x-r1  || c1xr1x+r1) {

dx1 = -dx1;  

}

cx =cx+dx;

cy =(int)(dx*Math.sqrt(r*r-(cx-rx)*(cx-rx)))+ry;

c1x =c1x+dx1;

c1y =(int)(dx1/2*Math.sqrt(r1*r1-(c1x-r1x)*(c1x-r1x))/2);

// g.drawArc(cx, cy, cw, ch, 0, 360);

for(int i=0;i8;i++){

if (i%5 == 0){

g.setColor(Color.black);                

}else if ( i%5== 1) {

g.setColor(Color.GREEN);

}else if(i%5==2){

g.setColor(Color.RED);

}else if( i%5 ==3){

g.setColor(Color.pink);

}else {

g.setColor(Color.orange);

}                       

g.drawLine(bx,by, cx+10,cy+i+10);

g.drawLine(bx+bw,by+bh,cx+10,cy+i+10);

g.drawLine(bx+bw,by, cx+10,cy+i+10);

g.drawLine(bx,by+bh, cx+10,cy+i+10);

g.drawLine(bx,by,-cx+bw-bx-cw+10,cy+i+10);

g.drawLine(bx+bw,by+bh,-cx+bw-bx-cw+10,cy+i+10);

g.drawLine(bx+bw,by,-cx+bw-bx-cw+10,cy+i+10);

g.drawLine(bx,by+bh,-cx+bw-bx-cw+10,cy+i+10);

g.drawLine(bx,by, c1x+10,c1y+r1y+i+10);

g.drawLine(bx+bw,by+bh,c1x+10,c1y+r1y+i+10);

g.drawLine(bx+bw,by, c1x+10,c1y+r1y+i+10);

g.drawLine(bx,by+bh, c1x+10,c1y+r1y+i+10);

g.drawLine(bx,by, r1x+r1+cw-c1x+10,-c1y+r1y+i+10);

g.drawLine(bx+bw,by+bh,r1x+r1+cw-c1x+10,-c1y+r1y+i+10);

g.drawLine(bx+bw,by, r1x+r1+cw-c1x+10,-c1y+r1y+i+10);

g.drawLine(bx,by+bh,r1x+r1+cw-c1x+10,-c1y+r1y+i+10);

g.drawArc(cx+i, cy+i, cw-i*2, ch-i*2, 0, 360);

g.drawArc(-cx+bw-bx-cw+i, cy+i, cw-i*2, ch-i*2, 0, 360);

g.drawArc(c1x+i, c1y+r1y+i, cw-i*2, ch-i*2, 0, 360);

g.drawArc(r1x+r1+cw-c1x+i, -c1y+r1y+i, cw-i*2, ch-i*2, 0, 360);

}

}

public void start(){      

if (u_thread == null)

{

u_thread  = new Thread(this);

u_thread.start();

}

}

public void run() {

while(true){                              

repaint(); 

try{

u_thread.sleep(10);

}

catch (InterruptedException e){

return;

}

}

}

}


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