Starting Applets

I've uploaded several examples of applets here

An applet is a Java program that is loaded and executed within an HTML page.

Write your class so it extends JApplet

public class HelloWorld extends JApplet {
      ...
      }  

Applets have some important methods to know about. You'll implement them unless you want the default implementation.
• init: run once. Intended for initializations
• start: run one or more times. Automatically called after init, and called when the user returns to the page containing the applet.
• stop: run one or more times. Automatically called when the user moves away from the page containing the applet. Can also be called by the applet code.
• destroy: called once when the browser shuts down normally.
• paint: called automatically. Used to draw the screen (import JApplet and Graphics to get paint to work.
• repaint: like paint, except it's used when the window (that has the applet) regains focus.

paint is useful

Copy and paste, run in IDE and display

import javax.swing.JApplet;
import java.awt.Graphics;

public class HelloWorld extends JApplet { 
   
	public void paint(Graphics g) {
		g.drawRect(10, 10, getSize().width - 20, getSize().height - 20); 
		g.drawString("Hello world!", 50, 55);
		}
		
	}

 

Here's an example of an html page with an applet in it: click here

Here's another code example to copy and paste taken from java.sun.com tutorials

import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import java.applet.Applet;

public class ApptoAppl extends Applet
		 implements ActionListener {

   JLabel text;
   JButton button;
   JPanel panel;
   private boolean _clickMeMode = true;

   public void init(){
     setLayout(new BorderLayout(1, 2));
     setBackground(Color.white);

     text = new JLabel("I'm a Simple Program");
     button = new JButton("Click Me");
     button.addActionListener(this);
     add("Center", text);
     add("South", button);
   }

  public void start(){
     System.out.println("Applet starting.");
  }

  public void stop(){
     System.out.println("Applet stopping.");
  }

  public void destroy(){
     System.out.println("Destroy method called.");
  }

   public void actionPerformed(ActionEvent event){
        Object source = event.getSource();
        if (_clickMeMode) {
          text.setText("Button Clicked");
          button.setText("Click Again");
          _clickMeMode = false;
        } else {
          text.setText("I'm a Simple Program");
          button.setText("Click Me");
          _clickMeMode = true;
        }
   }
}