Java Programming: You are given one JPanel StillClock.java(clock). Use your own thread to give them a life that means make the clock to work in real-time. Do it in Swing.

import java.awt.*;

import javax.swing.*;

import java.util.*;

public class StillClock extends JPanel {

private int hour;

private int minute;

private int second;

/** Construct a default clock with the current time*/

public StillClock() {

setCurrentTime();

}

/** Construct a clock with specified hour, minute, and second */

public StillClock(int hour, int minute, int second) {

this.hour = hour;

this.minute = minute;

this.second = second;

}

/** Return hour */

public int getHour() {

return hour;

}

/** Set a new hour */

public void setHour(int hour) {

this.hour = hour;

repaint();

}

/** Return minute */

public int getMinute() {

return minute;

}

/** Set a new minute */

public void setMinute(int minute) {

this.minute = minute;

repaint();

}

/** Return second */

public int getSecond() {

return second;

}

/** Set a new second */

public void setSecond(int second) {

this.second = second;

repaint();

}

@Override /** Draw the clock */

protected void paintComponent(Graphics g) {

super.paintComponent(g);

// Initialize clock parameters

int clockRadius =

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

int xCenter = getWidth() / 2;

int yCenter = getHeight() / 2;

// Draw circle

g.setColor(Color.black);

g.drawOval(xCenter - clockRadius, yCenter - clockRadius,

2 * clockRadius, 2 * clockRadius);

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

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

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

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

// Draw second hand

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);

// Draw minute hand

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

int xMinute = (int)(xCenter + mLength *

Math.sin(minute * (2 * Math.PI / 60)));

int yMinute = (int)(yCenter - mLength *

Math.cos(minute * (2 * Math.PI / 60)));

g.setColor(Color.blue);

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

// Draw hour hand

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);

}

public void setCurrentTime() {

// Construct a calendar for the current date and time

Calendar calendar = new GregorianCalendar();

// Set current hour, minute and second

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

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

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

}

@Override

public Dimension getPreferredSize() {

return new Dimension(200, 200);

}

}