How Can Make Analog Clock by Using Multihreading in Java

Introduction

In this article we are going to describe how to make an analog clock using the Graphics class in Java. For making an analog clock we need to use the Thread and Graphics classes of Java. The threading is used to move the seconds, minutes and hours hands and the Graphic class is used to create a line and oval and the color of the hand.

Following Steps for creating analog clock

Step 1: Importing necessary package.

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;

import javax.swing.JFrame;

import javax.swing.JPanel;

Step  2: Define a variable and making the object of the SimpleDate format class.

Thread thread = null;

SimpleDateFormat formatter = new SimpleDateFormat("s", Locale.getDefault());

Date currentDate;

int xcenter = 175, ycenter = 175, lastxs = 0, lastys = 0, lastxm = 0, lastym = 0,
lastxh = 0,lastyh = 0;

Step 3: We create a structure method for designing the analog clock.

private void drawStructure(Graphics g)

{
g.setFont(new Font("TimesRoman", Font.BOLD, 20));

g.setColor(Color.black);

g.fillOval(xcenter - 150, ycenter - 150, 300, 300);

g.setColor(Color.blue);

g.drawString("abhishek dubey" ,113,300);

g.setColor(Color.green);

g.drawString("9", xcenter - 145, ycenter +0);

g.drawString("3", xcenter + 135, ycenter + 0);

g.drawString("12", xcenter - 10, ycenter - 130);

g.drawString("6", xcenter - 10, ycenter + 145);

}

Step 4: Calculate seconds, minutes and hours from the current time.

xsecond = (int) (Math.cos(second * 3.14f / 30 - 3.14f / 2) * 120 + xcenter);

ysecond = (int) (Math.sin(second * 3.14f / 30 - 3.14f / 2) * 120 + ycenter);

xminute = (int) (Math.cos(minute * 3.14f / 30 - 3.14f / 2) * 100 + xcenter);

yminute = (int) (Math.sin(minute * 3.14f / 30 - 3.14f / 2) * 100 + ycenter);

xhour = (int) (Math.cos((hour * 30 + minute / 2) * 3.14f / 180 - 3.14f / 2) * 80 + xcenter);

yhour = (int) (Math.sin((hour * 30 + minute / 2) * 3.14f / 180 - 3.14f / 2) * 80 + ycenter;}

Step 5: Logic for moving the hands:

g.setColor(Color.magenta);

if (xsecond != lastxs || ysecond != lastys)

{

g.drawLine(xcenter, ycenter, lastxs, lastys);

}

if (xminute != lastxm || yminute != lastym)

{

g.drawLine(xcenter, ycenter - 1, lastxm, lastym);

g.drawLine(xcenter - 1, ycenter, lastxm, lastym);

}

if (xhour != lastxh || yhour != lastyh)

{

g.drawLine(xcenter, ycenter - 1, lastxh, lastyh);

g.drawLine(xcenter - 1, ycenter, lastxh, lastyh);

}
g.setColor(Color.magenta);
g.drawLine(xcenter, ycenter, xsecond, ysecond);

Step 6: For moving the minutes and hours hands:

g.setColor(Color.red);

g.drawLine(xcenter, ycenter - 1, xminute, yminute);

g.drawLine(xcenter - 1, ycenter, xminute, yminute);

g.setColor(Color.green);

g.drawLine(xcenter, ycenter - 1, xhour, yhour);

g.drawLine(xcenter - 1, ycenter, xhour, yhour);

lastxs = xsecond;

lastys = ysecond;

lastxm = xminute;

lastym = yminute;

lastxh = xhour;

lastyh = yhour;

Step 7: Define the method of the Runable Interface:

public void start()
{

if (thread == null)
{

thread = new Thread(this);

thread.start();

}

}
public void stop()

{
thread = null;

}
public void run()

{

while (thread != null)
{

try
{
Thread.sleep(100);

}
catch (InterruptedException e)
{}

repaint();

}

thread = null;

}
public void update(Graphics g)
{

paint(g);

}
 

Step 8: Creating a frame with in main methods.

public static void main(String args[])
{

JFrame window = new JFrame();
Color c=new Color(118,73,190);

window.setBackground(c);

window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

window.setBounds(0, 0, 400, 400);

Clock clock = new Clock();

window.getContentPane().add(clock);

window.setVisible(true);

clock.start();

}

Complete Code

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.Locale;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Clock extends JPanel implements Runnable

{

Thread thread = null;

SimpleDateFormat formatter = new SimpleDateFormat("s", Locale.getDefault());

Date currentDate;

int xcenter = 175, ycenter = 175, lastxs = 0, lastys = 0, lastxm = 0, lastym = 0, lastxh = 0,lastyh = 0;

private void drawStructure(Graphics g)

{

g.setFont(new Font("TimesRoman", Font.BOLD, 20));

g.setColor(Color.black);

g.fillOval(xcenter - 150, ycenter - 150, 300, 300);

g.setColor(Color.blue);

g.drawString("abhishek dubey" ,113,300);

g.setColor(Color.green);

g.drawString("9", xcenter - 145, ycenter +0);

g.drawString("3", xcenter + 135, ycenter + 0);

g.drawString("12", xcenter - 10, ycenter - 130);

g.drawString("6", xcenter - 10, ycenter + 145);

}

public void paint(Graphics g)

{

int xhour, yhour, xminute, yminute, xsecond, ysecond, second, minute, hour;drawStructure(g);

currentDate = new Date();

formatter.applyPattern("s");

second = Integer.parseInt(formatter.format(currentDate));

formatter.applyPattern("m");

minute = Integer.parseInt(formatter.format(currentDate));

formatter.applyPattern("h");

hour = Integer.parseInt(formatter.format(currentDate));

xsecond = (int) (Math.cos(second * 3.14f / 30 - 3.14f / 2) * 120 + xcenter);

ysecond = (int) (Math.sin(second * 3.14f / 30 - 3.14f / 2) * 120 + ycenter);

xminute = (int) (Math.cos(minute * 3.14f / 30 - 3.14f / 2) * 100 + xcenter);

yminute = (int) (Math.sin(minute * 3.14f / 30 - 3.14f / 2) * 100 + ycenter);

xhour = (int) (Math.cos((hour * 30 + minute / 2) * 3.14f / 180 - 3.14f / 2) * 80 + xcenter);

yhour = (int) (Math.sin((hour * 30 + minute / 2) * 3.14f / 180 - 3.14f / 2) * 80 + ycenter);

// Erase if necessary, and redraw

g.setColor(Color.magenta);

if (xsecond != lastxs || ysecond != lastys)

{

g.drawLine(xcenter, ycenter, lastxs, lastys);

}

if (xminute != lastxm || yminute != lastym)

{

g.drawLine(xcenter, ycenter - 1, lastxm, lastym);

g.drawLine(xcenter - 1, ycenter, lastxm, lastym);

}

if (xhour != lastxh || yhour != lastyh)

{

g.drawLine(xcenter, ycenter - 1, lastxh, lastyh);

g.drawLine(xcenter - 1, ycenter, lastxh, lastyh);

}

g.setColor(Color.magenta);

g.drawLine(xcenter, ycenter, xsecond, ysecond);

g.setColor(Color.red);

g.drawLine(xcenter, ycenter - 1, xminute, yminute);

g.drawLine(xcenter - 1, ycenter, xminute, yminute);

g.setColor(Color.green);

g.drawLine(xcenter, ycenter - 1, xhour, yhour);

g.drawLine(xcenter - 1, ycenter, xhour, yhour);

lastxs = xsecond;

lastys = ysecond;

lastxm = xminute;

lastym = yminute;

lastxh = xhour;

lastyh = yhour;

}

 

public void start()

{

if(thread == null)

{

thread = new Thread(this);

thread.start();

}

}

public void stop()

{

thread = null;

}

public void run()

{

while (thread != null)

{

try

{

Thread.sleep(100);

}catch (InterruptedException e){}

repaint();

}

thread = null;

public void update(Graphics g)

{

paint(g);

public static void main(String args[])

{}

JFrame window = new JFrame();

Color c=new Color(118,73,190);

window.setBackground(c);

window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

window.setBounds(0, 0, 400, 400);

Cock clock = new Clock();

window.getContentPane().add(clock);

window.setVisible(true)

clock.start();

}

}

 

OUTPUT