用JWidow写一个可以在桌面上拖动的小时钟

很多人可能对JWidow的使用不太清楚，下面就对JWidow写的一个小例子供参考！

import java.awt.*;

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) {
		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);
		}
	}
}

这里用到了其他的一些类，由于篇幅的原因，就不往上贴了。源代码下载地址：

http://download.csdn.net/download/luoweifu/4590710