Animal Zook

Animal.java
====================

public class Animal {
    //fields
    protected boolean _isAlive; //indicated if animal alive
    protected String _name; //animal name
    protected String _sound; //the sound that the animal makes

    public Animal (String name, String sound)
    {
        this._isAlive=true;
        this._name=name;
        this._sound=sound;
    }

    public String makeSound()
    {
        if (this._isAlive)
            return this._name + " makes " + this._sound;
        else
            return this._name + " is dead...";

    }

    public void die()
    {
        this._isAlive=false;
    }
}


Mouse.java
==================

public class Mouse extends Animal {

    public Mouse(String name, String sound) {
        super(name, sound);
    }

}

Cat.java
======================

public class Cat extends Animal{

    public Cat(String name, String sound) {
        super(name, sound);
    }

    public void eatMouse(Mouse mouse)
    {
        if (this._isAlive && mouse._isAlive)
            mouse.die();
    }

    public void drinkMilk(Cow cow)
    {
        if (cow.giveMilk())
            System.out.println("Yamm Yamm!");
        else
            System.out.println("Yak, "+cow._name+" is dead");
    }
}

Cow.java
====================

public class Cow extends Animal {

    public Cow(String name, String sound) {
        super(name, sound);
    }

    public boolean giveMilk()
    {
        return this._isAlive;
    }
}


Lion.java
===================

public class Lion extends Animal {

    public Lion(String name, String sound) {
        super(name, sound);
    }

    public void eatCow(Cow cow)
    {
        if (this._isAlive && cow._isAlive)
        {
            cow.die();
        }
    }
}


Tester.java
================

public class Tester {

    public static void main(String[] args) {
        final String MOUSE_SOUND="SQuitzz";
        final String CAT_SOUND="MEYOUUU";
        final String COW_SOUND="MOOOOOOO";
        final String LION_SOUND="GRRRRRR";

        Mouse m1=new Mouse("Mishka",MOUSE_SOUND);
        Mouse m2=new Mouse("Zeev",MOUSE_SOUND);

        Cat cat1=new Cat("Mitzi",CAT_SOUND);
        Cat cat2=new Cat("Shushi",CAT_SOUND);

        Cow cow1=new Cow("MushMush", COW_SOUND);
        Cow cow2=new Cow("Mumu", COW_SOUND);

        Lion lev = new Lion("LEV",LION_SOUND);

        System.out.println(lev.makeSound());
        System.out.println(cow1.makeSound());
        System.out.println(cat1.makeSound());
        System.out.println(m1.makeSound());
        System.out.println("==================");
        cat1.eatMouse(m1);
        System.out.println(m1.makeSound());
        cat1.drinkMilk(cow1);
        lev.eatCow(cow1);
        cat1.drinkMilk(cow1);
        cat1.drinkMilk(cow2);


    }

}