JAVA时钟

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import javax.swing.*;
import java.awt.*;
import java.util.*;
import java.lang.Thread;
import java.text.DecimalFormat;

public class DongClock extends JPanel {
  /**

   * @param args

   */

  private int hour;

  private int minute;

  private int second;

  //构造函数

  public DongClock() {

    setCurrentTime();

  }

  //返回小时

  public int getHour() {

    return hour;

  }

  public int getMinute() {

    return minute;

  }

  public int getSecond() {

    return second;

  }

  //绘制时钟

  protected void paintComponent(Graphics g) {

    super.paintComponent(g);

    //初始化

    int clockRadius = (int)(Math.min(getWidth(), getHeight()) * 0.8 * 0.5);

    int xCenter = getWidth() / 2;

    int yCenter = getHeight() / 2;

    //画圆

    g.setColor(Color.black);

    g.drawOval(xCenter - clockRadius, yCenter - clockRadius, 2 * clockRadius, 2 * clockRadius);

    g.drawString("12", xCenter - 5, yCenter - clockRadius + 15);

    g.drawString("9", xCenter - clockRadius + 3, yCenter + 5);

    g.drawString("3", xCenter + clockRadius - 10, yCenter + 3);

    g.drawString("6", xCenter - 3, yCenter + clockRadius - 3);

    //画秒针

    int sLength = (int)(clockRadius * 0.8);

    int xSecond = (int)(xCenter + sLength * Math.sin(second * (2 * Math.PI / 60)));

    int ySecond = (int)(yCenter - sLength * Math.cos(second * (2 * Math.PI / 60)));

    g.setColor(Color.red);

    g.drawLine(xCenter, yCenter, xSecond, ySecond);

    //画分针

    int mLenth = (int)(clockRadius * 0.65);

    int xMinute = (int)(xCenter + mLenth * Math.sin(minute * (2 * Math.PI / 60)));

    int yMinute = (int)(xCenter - mLenth * Math.cos(minute * (2 * Math.PI / 60)));

    g.setColor(Color.blue);

    g.drawLine(xCenter, yCenter, xMinute, yMinute);

    //画时针

    int hLength = (int)(clockRadius * 0.5);

    int xHour = (int)(xCenter + hLength * Math.sin((hour % 12 + minute / 60.0) * (2 * Math.PI / 12)));

    int yHour = (int)(yCenter - hLength * Math.cos((hour % 12 + minute / 60.0) * (2 * Math.PI / 12)));

    g.setColor(Color.green);

    g.drawLine(xCenter, yCenter, xHour, yHour);

    //画数字时钟

    g.setColor(Color.black);

    DecimalFormat s=new DecimalFormat("00");

    g.drawString(s.format(getHour()) + ":" + s.format(getMinute()) + ":" + s.format(getSecond()), xCenter - 22, yCenter - clockRadius - 15);
  }

  public void setCurrentTime() {

    Calendar calendar = new GregorianCalendar();

    this.hour = calendar.get(Calendar.HOUR_OF_DAY);

    this.minute = calendar.get(Calendar.MINUTE);

    this.second = calendar.get(Calendar.SECOND);

  }

  public static void main(String[] args) {

    // TODO Auto-generated method stub

    JFrame frame = new JFrame("DiaplayClock");

        frame.setResizable(false);

    frame.setTitle("DiaplayClock");

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.setSize(300,350);

    frame.setVisible(true);

    while(true) {
    DongClock clock = new DongClock();
    frame.getContentPane().add(clock);

      clock.setVisible(true);
      frame.validate();

      try {
        Thread.sleep(1000);
      }

      catch (InterruptedException e) {
        e.printStackTrace(); 
      }

      clock.setVisible(false);
      frame.remove(clock);
      clock = null;
      frame.validate();

    }
  }

}

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