用JWidow写一个可以在桌面上拖动的小时钟

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.net.URL;
import java.util.Calendar;

import javax.swing.*;
/**
* 用于显示时钟
* @author 罗伟富
*
*/
public class ShowClock extends JWindow implements Runnable, ActionListener{
/**
* 窗口的宽度
*/
public static final int WIDTH = 300;
/**
* 窗口的宽度
*/
public static final int HEIGHT = 330;
/**
* 时钟的宽度
*/
public static final int CWIDTH = 300;
/**
*时钟的高度
*/
public static final int CHEIGHT = 300;
/**
* 关闭按钮的宽度
*/
public static final int CLOSEWIDTH = 30;
/**
* 关闭按钮的宽度
*/
public static final int CLOSEHEIGHT = 30;
/**
*  度数转换成弧度的比例
*/
final double RAD = Math.PI / 180;
/**
* 时针、分针、秒针的参考半径
*/
public static final int R = 120;

private CalendarTime calTime;
private Image img;
private JPanel clockPanel;
private JButton closeButton;
private Thread thread;
private boolean isWorking = true;
//原点，半径（时、分、秒），角度，
private int ox, oy, r, h, m, s, hh, mm, ss;
private int X = 0, Y = 0;

/**
* 构造函数
* @param calTime Calendar对象，用于计时
* @param img 用于作为背景的图像
*/
public ShowClock(CalendarTime calTime, Image img) {
this.calTime = calTime;
this.img = img;
thread = new Thread(this);
thread.start();
initialize();
}
/**
* 为true，则计时器在计时，否则不计时
* @return  为true，则计时器在计时，否则不计时
*/
public boolean isWorking() {
return isWorking;
}
/**
* 设置isWork的状态
* @param isWorking
*/
public void setWorking(boolean isWorking) {
this.isWorking = isWorking;
}
/**
* 初始化组件
*/
public void initialize() {
ox = 150;
oy = 150;
final ImageIcon originalImg = new ImageIcon(this.getClass().getResource("/Images/close1.gif"));
final ImageIcon rolloverImg = new ImageIcon(this.getClass().getResource("/Images/close2.gif"));
closeButton = new ImageButton(originalImg);
closeButton.setRolloverIcon(rolloverImg);
closeButton.addActionListener(this);
clockPanel = new PaintPanel();
clockPanel.setPreferredSize(new Dimension(CWIDTH, CHEIGHT));
JLabel emptyLabel = new JLabel();
emptyLabel.setPreferredSize(new Dimension(WIDTH-CLOSEWIDTH, CLOSEHEIGHT));
Container c = getContentPane();
c.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 1;
gbc.gridheight = 1;
gbc.fill = gbc.HORIZONTAL;
gbc.anchor = gbc.CENTER;
c.add(emptyLabel, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
c.add(closeButton, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
gbc.gridwidth = 2;
c.add(clockPanel, gbc);
setSize(WIDTH, HEIGHT);
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
X = e.getX();
Y = e.getY();
}
}
);
addMouseMotionListener(new MouseAdapter() {
public void mouseDragged(MouseEvent e) {
setLocation(getLocation().x + (e.getX()-X),getLocation().y + (e.getY()-Y));
}
}
);
}
/**
* 每隔一秒中刷新一次显示时钟的屏幕
*/
public void run() {
try {
while(isWorking) {
Thread.sleep(1000);
clockPanel.repaint();
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
/**
*
*/
public void actionPerformed(ActionEvent e) {
if(e.getSource() == closeButton) {
setVisible(false);
}
}

public static void main(String[] args) {
7fe8

URL urlImg = ShowClock.class.getResource("/Images/clock.jpg");
Image imgClock = Toolkit.getDefaultToolkit().getImage(urlImg);
ShowClock showclock = new ShowClock(new CalendarTime(), imgClock);
showclock.setLocationRelativeTo(null);
showclock.setVisible(true);
}
/**
* 用于画时钟的JPanel面板
*/
class PaintPanel extends JPanel {
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2 = (Graphics2D)g;
g2.drawImage(img, 0, 0, CWIDTH, CHEIGHT, this);
h = calTime.get(Calendar.HOUR);
m = calTime.get(Calendar.MINUTE);
s = calTime.get(Calendar.SECOND);
ss = 90-6*s;
mm = 90-(6*m+s/10);	//即 mm = 90-(6*m+6*(s/60));
hh = 90-(30*h+m/2);	//即hh = 90-30*(m/60);
g2.setStroke(new BasicStroke(1.0f));
g2.setColor(Color.red);
int x1 = (int)(0.8*R*Math.cos(ss*RAD)) + ox;
int y1 = (int)(0.8*R*Math.sin(ss*RAD)) + oy;
g2.drawLine(ox, oy, x1, CHEIGHT-y1);

g2.setStroke(new BasicStroke(2.0f));
g2.setColor(new Color(138, 43, 226));
int x2 = (int)(0.7*R*Math.cos(mm*RAD)) + ox;
int y2 = (int)(0.7*R*Math.sin(mm*RAD)) + oy;
g2.drawLine(ox, oy, x2, CHEIGHT-y2);

g2.setStroke(new BasicStroke(5.0f));
g2.setColor(Color.black);
int x3 = (int)(0.5*R*Math.cos(hh*RAD)) + ox;
int y3 = (int)(0.5*R*Math.sin(hh*RAD)) + oy;
g2.drawLine(ox, oy, x3, CHEIGHT-y3);
}
}
}