Hey Alien, welcome to practice house. in this post we will learn how to create an analog clock in java using java applet. This program will help you understand about a logic that clock use and you will learn about thread. It’s just a fun project you can do and show to your friend that you did it.
Customize a little bit and have fun. So here is the code
File:AnalaogClock.java
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package com.practice.house; import java.util.*; import java.text.*; import java.applet.*; import java.awt.*; public class AnalogClock extends Applet implements Runnable { String clkString = ""; int clockHours = 0, clockMinutes = 0, clockSeconds = 0; int clkwidth, clkheight; boolean threadSuspended; Thread thr = null; public void init() { clkwidth = getSize().width; clkheight = getSize().height; setBackground(Color.cyan); } public void start() { if (thr == null) { thr = new Thread(this); thr.setPriority(Thread.MIN_PRIORITY); threadSuspended = false; thr.start(); }else { if (threadSuspended) { threadSuspended = false; synchronized (this) { notify(); } } } } public void stop() { threadSuspended = true; } public void run() { try { while (true) { Calendar calender = Calendar.getInstance(); clockHours = calender.get(Calendar.HOUR_OF_DAY); if (clockHours > 12) clockHours -= 12; clockMinutes = calender.get(Calendar.MINUTE); clockSeconds = calender.get(Calendar.SECOND); SimpleDateFormat frmatter = new SimpleDateFormat("hh:mm:ss", Locale.getDefault()); Date d = calender.getTime(); clkString = frmatter.format(d); if (threadSuspended) { synchronized (this) { while (threadSuspended) { wait(); } } } repaint(); thr.sleep(1000); } } catch (Exception e) { System.out.printf("","Error Occured"); } } void drawHand(double angle, int radius, Graphics grp) { angle -= 0.5 * Math.PI; int a = (int) (radius * Math.cos(angle)); int b = (int) (radius * Math.sin(angle)); grp.drawLine(clkwidth / 2, clkheight / 2, clkwidth / 2 + a, clkheight / 2 + b); } void drawWedge(double angle, int radius, Graphics grp) { angle -= 0.5 * Math.PI; int a = (int) (radius * Math.cos(angle)); int b = (int) (radius * Math.sin(angle)); angle += 2 * Math.PI / 3; int a2 = (int) (5 * Math.cos(angle)); int b2 = (int) (5 * Math.sin(angle)); angle += 2 * Math.PI / 3; int a3 = (int) (5 * Math.cos(angle)); int b3 = (int) (5 * Math.sin(angle)); grp.drawLine(clkwidth / 2 + a2, clkheight / 2 + b2, clkwidth / 2 + a, clkheight / 2 + b); grp.drawLine(clkwidth / 2 + a3, clkheight / 2 + b3, clkwidth / 2 + a, clkheight / 2 + b); grp.drawLine(clkwidth / 2 + a2, clkheight / 2 + b2, clkwidth / 2 + a3, clkheight / 2 + b3); } public void paint(Graphics grp) { grp.setColor(Color.red); drawWedge(2 * Math.PI * clockHours / 12, clkwidth / 5, grp); drawWedge(2 * Math.PI * clockMinutes / 60, clkwidth / 3, grp); drawHand(2 * Math.PI * clockSeconds / 60, clkwidth / 2, grp); grp.setColor(Color.black); grp.drawString(clkString, 10, clkheight - 10); grp.drawString("pracitceHouse.com", 113, 300); } } |
hey, so it’s kinda big program but very easy to understand that what’s going on this code. i hope you are having fun after running this application. let me share how my clock looks like.
OUTPUT:
okay guys, see you in another post. here in practice house we have a log of example java programs that will help you to learn a lot of programs. so stay tune with us.
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