In this article, we shall be animating the applet window to show an Analog Clock with a 1-second delay. The idea is to display the system time of every instance.
Approach:
Each hand of the clock will be animating with 1-second delay keeping one end at the centre. The position of the other end can be derived by the system time. The angle formed by a hand of the clock in every second will be different throughout its journey. This is why various instances make a different angle to the horizontal line.
How to run:
1. Save the file as analogClock.java and run the following commands. 2. javac analogClock.java 3. appletviewer analogClock.java
Below is the implementation of the above approach:
Program:
// Java program to illustrate// analog clock using Applets  import java.applet.Applet;import java.awt.*;import java.util.*;  public class analogClock extends Applet {      @Override    public void init()    {        // Applet window size & color        this.setSize(new Dimension(800, 400));        setBackground(new Color(50, 50, 50));        new Thread() {            @Override            public void run()            {                while (true) {                    repaint();                    delayAnimation();                }            }        }.start();    }      // Animating the applet    private void delayAnimation()    {        try {              // Animation delay is 1000 milliseconds            Thread.sleep(1000);        }        catch (InterruptedException e) {            e.printStackTrace();        }    }      // Paint the applet    @Override    public void paint(Graphics g)    {        // Get the system time        Calendar time = Calendar.getInstance();          int hour = time.get(Calendar.HOUR_OF_DAY);        int minute = time.get(Calendar.MINUTE);        int second = time.get(Calendar.SECOND);          // 12 hour format        if (hour > 12) {            hour -= 12;        }          // Draw clock body center at (400, 200)        g.setColor(Color.white);        g.fillOval(300, 100, 200, 200);          // Labeling        g.setColor(Color.black);        g.drawString("12", 390, 120);        g.drawString("9", 310, 200);        g.drawString("6", 400, 290);        g.drawString("3", 480, 200);          // Declaring variables to be used        double angle;        int x, y;          // Second hand's angle in Radian        angle = Math.toRadians((15 - second) * 6);          // Position of the second hand        // with length 100 unit        x = (int)(Math.cos(angle) * 100);        y = (int)(Math.sin(angle) * 100);          // Red color second hand        g.setColor(Color.red);        g.drawLine(400, 200, 400 + x, 200 - y);          // Minute hand's angle in Radian        angle = Math.toRadians((15 - minute) * 6);          // Position of the minute hand        // with length 80 unit        x = (int)(Math.cos(angle) * 80);        y = (int)(Math.sin(angle) * 80);          // blue color Minute hand        g.setColor(Color.blue);        g.drawLine(400, 200, 400 + x, 200 - y);          // Hour hand's angle in Radian        angle = Math.toRadians((15 - (hour * 5)) * 6);          // Position of the hour hand        // with length 50 unit        x = (int)(Math.cos(angle) * 50);        y = (int)(Math.sin(angle) * 50);          // Black color hour hand        g.setColor(Color.black);        g.drawLine(400, 200, 400 + x, 200 - y);    }} |
Output:
