APPLET SKELETON

An Applet Skeleton

Most applets override these four methods. These four methods forms Applet lifecycle.

• init() : init() is the first method to be called. This is where variable are initialized. This method is called only once during the runtime of applet.
• start() : start() method is called after init(). This method is called to restart an applet after it has been stopped.
• stop() : stop() method is called to suspend thread that does not need to run when applet is not visible.
• destroy() : destroy() method is called when your applet needs to be removed completely from memory.

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Example of an Applet Skeleton

import java.awt.*; 
import java.applet.*; 
public class AppletTest extends Applet
{
 public void init()
 {
  //initialization 
 }
 public void start ()
 {
  //start or resume execution 
 }
 public void stop()
 {
  //suspend execution 
 {
 public void destroy()
 {
  //perform shutdown activity
 }
 public void paint (Graphics g)
 {
  //display the content of window
 }
}

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Example of an Applet

import java.applet.*;
import java.awt.*;
public class MyApplet extends Applet 
{
 int height, width;
 public void init() 
 {
  height = getSize().height;
  width = getSize().width;
  setName("MyApplet");
 }
 public void paint(Graphics g)
 {
  g.drawRoundRect(10, 30, 120, 120, 2, 3);
 }
}

Running Applet using Applet Viewer

To execute an Applet with an applet viewer, write short HTML file as discussed above. If name it as run.htm, then the following command will run your applet program.

f:/>appletviewer run.htm