Getting Applet Parameters and Event Handling and Using the super keyword in java pro

Getting Applet Parameters

import java.applet.*;

import java.awt.*;

public class CheckerApplet extends Applet

{

   int squareSize = 50;

   public void init () {}

   private void parseSquareSize (String param) {}

   private Color parseColor (String param) {}

   public void paint (Graphics g) {}

}

Event Handling

import java.awt.event.MouseListener;

import java.awt.event.MouseEvent;

import java.applet.Applet;

import java.awt.Graphics;

public class ExampleEventHandling extends Applet implements MouseListener             

{

    StringBuffer strBuffer;

    public void init() 

   {

   addMouseListener(this);

   strBuffer = new StringBuffer();

        addItem("initializing the apple ");

    }

              public void start() 

             {

        addItem("starting the applet ");

    }

    public void stop() 

   {

        addItem("stopping the applet ");

    }

              public void destroy() 

              {

        addItem("unloading the applet");

    }

    void addItem(String word) 

   {

        System.out.println(word);

        strBuffer.append(word);

        repaint();

    }

    public void paint(Graphics g) 

  {

           g.drawRect(0, 0, 

           getWidth() - 1,

           getHeight() - 1);

        g.drawString(strBuffer.toString(), 10, 20);

    } 

    public void mouseEntered(MouseEvent event) 

   {

    }

    public void mouseExited(MouseEvent event) 

   {

    }

    public void mousePressed(MouseEvent event) 

    {

    }

    public void mouseReleased(MouseEvent event) 

   {

    }

    public void mouseClicked(MouseEvent event) 

   {

   addItem("mouse clicked! ");

    }

}

Displaying Images

import java.applet.*;

import java.awt.*;

import java.net.*;

public class ImageDemo extends Applet

{

  private Image image;

  private AppletContext context;

  public void init()

  {

      context = this.getAppletContext();

      String imageURL = this.getParameter("image");

      if(imageURL == null)

      {

         imageURL = "java.jpg";

      }

      try

      {

         URL url = new URL(this.getDocumentBase(), imageURL);

         image = context.getImage(url);

      }

       catch(MalformedURLException e)

      {

         e.printStackTrace();

         context.showStatus("Could not load image!");

      }

   }

   public void paint(Graphics g)

   {

      context.showStatus("Displaying image");

      g.drawImage(image, 0, 0, 200, 84, null);

      g.drawString("www.javalicense.com", 35, 100);

   }  

}

Create a package

package animals;

public class MammalInt implements Animal

{

   public void eat()

{

      System.out.println("Mammal eats");

   }

   public void travel()

  {

      System.out.println("Mammal travels");

   } 

   public int noOfLegs()

  {

      return 0;

   }

   public static void main(String args[])

   {

      MammalInt m = new MammalInt();

      m.eat();

      m.travel();

   }

} 

Using the super keyword

class Animal

{

   public void move()

  {

      System.out.println("Animals can move");

   }

}

class Dog extends Animal

{

   public void move()

  {

      super.move();

      System.out.println("Dogs can walk and run");

   }

}

public class TestDog

{

   public static void main(String args[])

  {

      Animal b = new Dog();

      b.move(); 

   }

}