時鐘面板程序可以直接用了

//ClockPanel.java import static java.util.Calendar.HOUR; import static java.util.Calendar.MILLISECOND; import static java.util.Calendar.MINUTE; import static java.util.Calendar.SECOND;import java.awt.AlphaComposite; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Composite; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.RenderingHints; import java.awt.event.MouseEvent; import java.util.Calendar; import javax.swing.ImageIcon; import javax.swing.JDialog; import javax.swing.JFrame; import javax.swing.JPanel;/*** 時鐘面板* */ public class ClockPanel extends JPanel implements Runnable {// 3個指針的粗細private static final BasicStroke HOURS_POINT_WIDTH = new BasicStroke(5);private static final BasicStroke MINUETES_POINT_WIDTH = new BasicStroke(3);private static final BasicStroke SEC_POINT_WIDTH = new BasicStroke(2);private ImageIcon background;private int centerX; // 中心坐標private int centerY;private final static int secLen = 60; // 指針長度private final static int minuesLen = 55; // 指針長度private final static int hoursLen = 36; // 指針長度private Point fp; // 拖曳窗體之前的鼠標位置/*** 構造方法*/public ClockPanel() {setOpaque(false);background = new ImageIcon(getClass().getResource("Core.png"));int iconWidth = background.getIconWidth();centerX = iconWidth / 2;int iconHeight = background.getIconHeight();centerY = iconHeight / 2;setPreferredSize(new Dimension(532, 286));new Thread(this).start();}@Overridepublic void paint(Graphics g) {Graphics2D g2 = (Graphics2D) g.create();Composite composite = g2.getComposite();g2.setComposite(AlphaComposite.SrcOver.derive(0.6f));Calendar calendar = Calendar.getInstance();drawClock(g2, calendar);// 繪制時鐘g2.setComposite(composite);g2.drawImage(background.getImage(), 0, 0, this);g2.dispose();}private void drawClock(Graphics2D g2, Calendar calendar) {int millisecond = calendar.get(MILLISECOND);int sec = calendar.get(SECOND);int minutes = calendar.get(MINUTE);int hours = calendar.get(HOUR);double secAngle = (60 - sec) * 6 - (millisecond / 150); // 秒針角度int minutesAngle = (60 - minutes) * 6;// 分針角度int hoursAngle = (12 - hours) * 360 / 12 - (minutes / 2);// 時針角度// 計算秒針、分針、時針指向坐標int secX = (int) (secLen * Math.sin(Math.toRadians(secAngle)));int secY = (int) (secLen * Math.cos(Math.toRadians(secAngle)));int minutesX = (int) (minuesLen * Math.sin(Math.toRadians(minutesAngle)));int minutesY = (int) (minuesLen * Math.cos(Math.toRadians(minutesAngle)));int hoursX = (int) (hoursLen * Math.sin(Math.toRadians(hoursAngle)));int hoursY = (int) (hoursLen * Math.cos(Math.toRadians(hoursAngle)));g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);// 分別繪制時針、分針、秒針g2.setColor(Color.BLACK);g2.setStroke(HOURS_POINT_WIDTH);g2.drawLine(centerX, centerY, centerX - hoursX, centerY - hoursY);g2.setStroke(MINUETES_POINT_WIDTH);g2.setColor(new Color(0x2F2F2F));g2.drawLine(centerX, centerY, centerX - minutesX, centerY - minutesY);g2.setColor(Color.RED);g2.setStroke(SEC_POINT_WIDTH);g2.drawLine(centerX, centerY, centerX - secX, centerY - secY);// 繪制3個指針的中心園g2.fillOval(centerX - 5, centerY - 5, 10, 10);}@Overridepublic void run() {try {while (true) {if (getRootPane() != null) {JFrame main = (JFrame) getRootPane().getParent();if (main != null && main.isVisible()) {EventQueue.invokeLater(new Runnable() {public void run() {ClockPanel.this.repaint();//每隔1秒繪制clock}});}}Thread.sleep(100);}} catch (InterruptedException e) {e.printStackTrace();}}protected void do_this_mouseDragged(final MouseEvent e) {JDialog frame = (JDialog) getRootPane().getParent();Point point = e.getLocationOnScreen();frame.setLocation(point.x - fp.x, point.y - fp.y);}protected void do_this_mousePressed(final MouseEvent e) {fp = e.getPoint();} } //使用時鐘面板的組件中 //添加時鐘面板，實例化面板對象就好 JPanel panel = new ClockPanel(); panel.setBounds(377, 54, 151, 142); getContentPane().add(panel);

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