// Written by:	Darren Gates & Ray Klefstad
// Date:	January 2000
// School:	U.C. Irvine

import java.awt.*;
import java.applet.*;

public class InterfacesExample
    extends Applet
{
    public void init()
    {
        TextArea pets = new TextArea(7, 35);

        Rabbit myRabbit = new Rabbit("Roger");
        Cat myCat = new Cat("Sylvester");
        Bunny myBunny = new Bunny("Bugs");

        String message = myRabbit.feed() + myCat.feed() 
            + myBunny.feed();

        pets.setText(message);
        add(pets);
    }
}

interface Food
{
    // constants and method declarations only
    public static final String Rabbit = "carrots";
    public static final String Cat = "tuna";
    public String feed();
}

class Pet
{
    protected String name;
    
    public Pet(String newName)
    {
        name = newName;
    }
}

class Rabbit
    extends Pet
    implements Food // must implement all methods of Food
{    
    public Rabbit(String name)
    {
        super(name);   
    }
    public String feed()
    {
        return name + " should be fed " + Food.Rabbit + ".\n"; 
    }
}

// since Bunny extends Rabbit, it also implements Food

class Bunny   
    extends Rabbit
{
    public Bunny(String name)
    {
        super(name);
    }
    public String feed()
    {
        return name + ", the bunny, should be fed " 
	    + Food.Rabbit + ".\n";
    }
}

class Cat
    extends Pet
    implements Food
{
    public Cat(String name)
    {
        super(name);   
    }
    public String feed()
    {
        return name + " should be fed " + Food.Cat + ".\n";
    }
}