本文实现了两个效果：

第一种，同心圆效果图：

/** *程序要求：新建一个600*600像素的应用程序窗口，并在窗口中绘制5个不同颜色的同心圆， *所有圆心都是屏幕的中心点，相邻两个圆直接的半径相差50像素 *效果图如下图所示（颜色随机设置），源程序保存为Ex7_1.java。 *作者：wwj *日期：2012/4/25 *功能：显示一个有5个不同颜色的同心圆 **/ import javax.swing.*; import java.awt.*; import java.awt.Color; public class Ex7_1 extends JFrame { int red,green,blue; Color color; public Ex7_1() { super("一个有5个不同颜色的同心圆"); //显示窗口名称 setSize(600,600); //设置窗口大小 setVisible(true); //设置为可见 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置窗口关闭动作 } public void paint(Graphics g) { //第一个圆 red=(int)(Math.random()*255); green=(int)(Math.random()*255); blue=(int)(Math.random()*255); color=new Color(red,green,blue); g.setColor(color); g.fillOval(175,175,250,250); //第二个圆 red=(int)(Math.random()*255); green=(int)(Math.random()*255); blue=(int)(Math.random()*255); color=new Color(red,green,blue); g.setColor(color); g.fillOval(200,200,200,200); //第三个圆 red=(int)(Math.random()*255); green=(int)(Math.random()*255); blue=(int)(Math.random()*255); color=new Color(red,green,blue); g.setColor(color); g.fillOval(225,225,150,150); //第四个圆 red=(int)(Math.random()*255); green=(int)(Math.random()*255); blue=(int)(Math.random()*255); color=new Color(red,green,blue); g.setColor(color); g.fillOval(250,250,100,100); //第五个圆 red=(int)(Math.random()*255); green=(int)(Math.random()*255); blue=(int)(Math.random()*255); color=new Color(red,green,blue); g.setColor(color); g.fillOval(275,275,50,50); } public static void main(String[] args) { Ex7_1 e = new Ex7_1(); } }

第二种，播放音乐和切换图片的小程序效果图：

/** *程序要求:编写一个Applet的小程序，准备5幅图片和三个音乐文件，绘制到Applet中， *并增加几个按钮，控制图片的切换、放大、缩小和音乐文件的播放。 *作者：wwj *日期：2012/4/29 *参考：neicole *功能：能进行图片和歌曲的选择变换的applet小程序 **/ import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.applet.Applet; import java.applet.AudioClip; public class Ex7_2 extends Applet implements ActionListener,ItemListener { //创建两个面板 JPanel p1=new JPanel(); JPanel p2=new JPanel(); JPanel p3=new JPanel(); //声音对象 AudioClip[] sound=new AudioClip[3]; int playingSong=0; //切换图片的按钮 JButton lastPic=new JButton("上一张"); JButton setLarge=new JButton("放大"); JButton setLittle=new JButton("缩小"); JButton nextPic=new JButton("下一张"); //切换歌曲的按钮 JButton lastSound=new JButton("上一首"); JButton play=new JButton("播放"); JButton loop=new JButton("连续"); JButton stop=new JButton("停止"); JButton nextSound=new JButton("下一首"); //曲目下拉列表 JComboBox xx; String names[]={ "曲目1.wav","曲目2.wav","曲目3.wav"}; //创建画布对象 MyCanvasl showPhotos; public void init() { //窗口布局 this.setLayout(new BorderLayout()); //为图片控制按钮注册监听器 lastPic.addActionListener(this); setLarge.addActionListener(this); setLittle.addActionListener(this); nextPic.addActionListener(this); //向面板p1添加组件 p1.add(lastPic); p1.add(setLarge); p1.add(setLittle); p1.add(nextPic); p1.repaint(); //实例化下拉列表对象 xx = new JComboBox(names); xx.addItemListener(this); //为控制播放音乐按钮注册监听器 lastSound.addActionListener(this); play.addActionListener(this); loop.addActionListener(this); stop.addActionListener(this); nextSound.addActionListener(this); for(int i=0;i<3;i++) { sound[i]=getAudioClip(getCodeBase(),"music/"+"曲目" +Integer.toString(i+1)+".wav"); } //向面板p2添加组件 p2.add(xx); p2.add(lastSound); p2.add(play); p2.add(loop); p2.add(stop); p2.add(nextSound); p2.repaint(); showPhotos = new MyCanvasl(); p3.add(showPhotos); p3.repaint(); //把面板p1和p2分别布置到窗口的北部和南部 add(p1,BorderLayout.NORTH); add(p2,BorderLayout.SOUTH); add(p3,BorderLayout.CENTER); this.repaint(); } //按钮的事件处理 public void actionPerformed(ActionEvent e) { if(e.getSource() == lastPic){ showPhotos.changePhotoShow('P'); } else if(e.getSource() == nextPic){ showPhotos.changePhotoShow('N'); } else if(e.getSource() == setLarge){ showPhotos.changePhotoSize('B'); } else if(e.getSource() == setLittle){ showPhotos.changePhotoSize('S'); } else if(e.getSource()==lastSound){ //上一首 sound[playingSong].stop(); playingSong=(playingSong-1+3)%3; xx.setSelectedIndex(playingSong); sound[playingSong].play(); } else if(e.getSource()==play){ //按下播放按钮 sound[playingSong].play(); } else if(e.getSource()==loop){ //按下循环按钮 sound[playingSong].loop(); } else if(e.getSource()==stop){ //按下停止按钮 sound[playingSong].stop(); } else{ //下一首 sound[playingSong].stop(); playingSong=(playingSong+1)%3; xx.setSelectedIndex(playingSong); sound[playingSong].play(); } } //下拉列表的事件处理 public void itemStateChanged(ItemEvent e) { sound[playingSong].stop(); sound[playingSong]=getAudioClip(getCodeBase(),"music/"+xx.getSelectedItem()); } class MyCanvasl extends Canvas { public Image[] img=new Image[5]; int MaxWidth = 600; int MaxHeight = 500; int nowImageIndex = 0; int coordinateX = 0; int coordinateY = 0; int currentWidth = MaxWidth; int currentHeight = MaxHeight; MyCanvasl(){ setSize(MaxWidth,MaxHeight); //获取当前目录下的图片 for(int i=0;i<5;i++){ img[i]=getImage(getCodeBase(),"image/"+Integer.toString(i+1)+".jpg"); } } private void changePhotoIndex(int index){ nowImageIndex = index; changePhotoSize('M'); } public void changePhotoShow(char command){ if('P' == command){ changePhotoIndex((nowImageIndex + 5 - 1 ) % 5); } else if('N' == command){ changePhotoIndex((nowImageIndex + 1) % 5); } } public void changePhotoSize(char command){ if ('M' == command){ currentWidth = MaxWidth; currentHeight = MaxHeight; } else if ('B' == command){ if(MaxWidth >= (currentWidth + 100) && MaxHeight >= (currentHeight + 100)){ currentWidth += 100; currentHeight += 100; } } else if('S' == command){ if((0 < (currentWidth - 100)) && (0 < (currentHeight - 100))){ currentWidth = currentWidth - 100; currentHeight = currentHeight - 100; } } coordinateX = (MaxWidth - currentWidth) / 2; coordinateY = (MaxHeight - currentHeight) / 2; repaint(); } //paint方法用来在窗口显示图片 public void paint(Graphics g){ g.drawImage(img[nowImageIndex],coordinateX,coordinateY,currentWidth,currentHeight,this); } } }

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