;
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要制造那种效果只需要大约 30 行 Java 代码：
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
class RollingBall extends JPanel {
Ellipse2D.Float ball = new Ellipse2D.Float( -100, 100, 50, 50 );
public void paintComponent( Graphics g ) {
super.paintComponent( g );
Graphics2D g2 = ( Graphics2D ) g;
// Draw the ball
g2.fill( ball );
// Draw the rotating ellipse by skewing the Device Space
double angdeg = // One rotation per ball's travelling over its perimeter
ball.x++ % ( Math.PI * ball.width ) / ( Math.PI * ball.width ) * 360;
g2.rotate( Math.toRadians( angdeg ), ball.getCenterX( ), ball.getCenterY( ) );
g2.scale( .5, 1 );
g2.translate( ball.getCenterX( ), 0 );
g2.setColor( Color.gray );
g2.fill( ball );
}
public void roll( ) throws Exception {
while( true ) {
repaint( );
Thread.sleep( 8 );
}
}
public static void main( String[ ] args ) throws Exception {
JFrame f = new JFrame( );
RollingBall rb = new RollingBall( );
f.setSize( 999, 185 );
f.getContentPane( ).add( rb );
f.setVisible( true );
rb.roll( );
}
}
我这们是嵌入在网页中的，你运行试试 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Ball extends JApplet implements Runnable { private Thread blueBall; private boolean xUp,yUp,bouncing; private int x,y,xDx,yDy; private final int MAX_X = 200, MAX_Y = 200; public void init() { xUp = false; yUp = false; xDx = 1; yDy =1; bouncing = false; addMouseListener( new MouseListener(){ public void mousePressed(MouseEvent event){ creatBall(event); } //鼠标按下 public void mouseExited(MouseEvent event){} public void mouseClicked(MouseEvent event){} public void mouseReleased(MouseEvent event){} public void mouseEntered(MouseEvent event){} } ); setSize(MAX_X,MAX_Y); } private void creatBall(MouseEvent event){ if(blueBall == null){ x = event.getX(); y = event.getY();//获取按下的位置 blueBall = new Thread(this); bouncing = true; blueBall.start(); } } public void stop() { blueBall = null; } public void paint(Graphics g) { super.paint(g); if(bouncing){ g.setColor(Color.red); g.fillOval(x,y,20,20); } } public void run() { while(true) { try{ blueBall.sleep(20); }catch(InterruptedException exception){ System.err.println(exception.toString()); } if(xUp == true) x += xDx; else x -= xDx; if(yUp == true) y += yDy; else y -= yDy; if(y = 0){ yUp = true; yDy = (int) (Math.random() * 5 + 2); } else if(y = MAX_Y - 10){ yDy = (int) (Math.random() * 5 + 2); yUp = false; } if(x = 0){ xUp = true; xDx = (int) (Math.random() * 5 + 2); } else if(x = MAX_X - 10){ xDx = (int) (Math.random() * 5 + 2); xUp = false; } repaint(); } } }
采纳哦
05年写的，你修改一下吧
/*
* 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 java.awt.Color;
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;
}
}
}
}
//简单的做个
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class Circle extends JFrame {
public Circle(){
super();
CirclePanel panel=new CirclePanel();
add(panel, "Center");
setSize(500, 500);
setVisible(true);
}
public static void main(String[] args) {
new Circle();
}
class CirclePanel extends JPanel{
public static final double PI=Math.PI;
private int degree=0;
private int axisx;
private int axisy;
public CirclePanel(){
setSize(500, 500);
axisx=getWidth()/2;
axisy=getHeight()/2;
setVisible(true);
Timer timer=new Timer(10,new TimerListener());
timer.start();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.fillRect(axisx, axisy, 2, 2);
g.drawOval((int)(axisx-100+5), (int)(axisy-100+5), 200, 200);
g.fillOval(-(int)(100*Math.sin(PI*degree/180))+axisx,
(int)(100*Math.cos(PI*degree/180))+axisy, 10, 10);
}
class TimerListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
degree += 1;
repaint();
}
}
}
}
第三题的答案
package image;
import java.awt.EventQueue;
public class Test {
private JFrame frame;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Test window = new Test();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Test() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 466);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JPanel panel = new JPanel();
panel.setBackground(Color.YELLOW);
panel.setForeground(Color.BLACK);
panel.setBounds(10, 10, 414, 138);
frame.getContentPane().add(panel);
JButton btnNewButton_1 = new JButton("New button");
panel.add(btnNewButton_1);
JButton btnNewButton = new JButton("New button");
panel.add(btnNewButton);
JPanel panel_1 = new JPanel();
panel_1.setBackground(Color.GREEN);
panel_1.setBounds(10, 158, 414, 259);
frame.getContentPane().add(panel_1);
JButton btnNewButton_3 = new JButton("New button");
panel_1.add(btnNewButton_3);
JButton btnNewButton_2 = new JButton("New button");
panel_1.add(btnNewButton_2);
}
}
java是编程语言里比较难学的一门，如果有心从事编程方向的工作，最好到专业机构学习并有更多的项目实践，更贴近市场，这样更有利于将来的发展。