CSCI152 L5 P1

////////////////////////////////////////////////////////////// Animal Interface
public interface Animal {

    /**
     * Returns the kind of the animal.
     *
     * @return the kind of the animal
     */
    public String animalKinde();

    /**
     * returns the current age of the animal.
     *
     * @return the age of the animal
     */
    public int getAge();

    /**
     * Returns true if the animal can eat the given food.
     *
     * @param food - the name of food
     * @return whether or not the animal can the given food
     */
    public boolean canEat(String food);

    /**
     *
     * @param food
     * @throws Exception
     */
    public void feed(String food) throws Exception;

    /**
     * The animal sleeps
     */
    public void sleep();

    /**
     * Increments the animal's age by one year.
     * @throws java.lang.Exception
     */
    public void ageOneYear() throws Exception;
}

//////////////////////////////////////////////////////////////////// Animal Implementation
public class AnimalImpl implements Animal{

    private int age;
    private int maxAge;
    private boolean isAlive;

    public AnimalImpl(int ma){
        age=0;
        maxAge=ma;
        isAlive=true;
    }

    @Override
    public String animalKinde() {
        return "undefined.";
    }

    @Override
    public int getAge() {
        return age;
    }

    @Override
    public boolean canEat(String food) {
        return false;
    }

    @Override
    public void feed(String food) throws Exception{
        if (!this.canEat(food)){
            throw new Exception("The animal cannot eat "+food);
        }
        System.out.println("Nom Nom");
    }

    @Override
    public void sleep()
    {
        System.out.println("Z-z-z");
    }

    @Override
    public void ageOneYear() throws Exception{
        if (age>=maxAge){
            throw new Exception("The animal was died.");
        }
        age++;
    }

    public String toString(){
        return "Animal which is "+age+" years old.";
    }
}

/////////////////////////////////////////////////////////////////////////////// Tiger
public class Tiger extends AnimalImpl{

    public Tiger(){
        super(12);
    }

    public String animalKinde(){
        return "Tiger";
    }

    public boolean canEat(String food){
        if (food.equals("Meat")){
            return true;
        }
        return false;
    }

    public void feed(String food) throws Exception{
        if (!this.canEat(food)){
            throw new Exception("Tigers cannot eat "+food);
        }
        System.out.println("Munch Munch!");
    }

    public String toString(){
        return "Tiger which is " + getAge() + " years old.";
    }
}

//////////////////////////////////////////////////////////////////////////// Cow
public class Cow extends AnimalImpl{

    public Cow(){
        super(10);
    }

    public String animalKinde(){
        return "Cow";
    }

    public boolean canEat(String food){
        if (food.equals("Grass")){
            return true;
        }
        return false;
    }

    public void feed(String food) throws Exception{
        if (!this.canEat(food)){
            throw new Exception("Cows cannot eat "+food);
        }
        System.out.println("nooom nooom nooom");
    }

    public String toString(){
        return "Cow which is " + getAge() + " years old.";
    }
}

////////////////////////////////////////////////////////////////////////////////// Monkey
public class Monkey extends AnimalImpl{

    public Monkey(){
        super(15);
    }

    public String animalKinde(){
        return "Monkey";
    }

    public boolean canEat(String food){
        if (food.equals("Banana")){
            return true;
        }
        return false;
    }

    public void feed(String food) throws Exception{
        if (!this.canEat(food)){
            throw new Exception("Monkeys cannot eat "+food);
        }
        System.out.println("nom");
    }

    public String toString(){
        return "Monkey which is " + getAge() + " years old.";
    }
}

/////////////////////////////////////////////////////////////////////// Test Class
public class TestAnimal {

    public static void feedMeat(Animal animal){
        try{
            animal.feed("Meat");
        } catch (Exception ex){
            System.out.println(ex.getMessage());
        }
    }
    public static void main(String[] args){
        Animal cow=new Cow();
        Animal tiger=new Tiger();
        Animal monkey=new Monkey();
        for (int i=0; i<11; i++){
            try {
                cow.ageOneYear();
                System.out.println(cow);
            } catch (Exception ex){
                System.out.println(ex.getMessage());
            }
        }

        try{
            feedMeat(tiger);
        } catch (Exception ex){
            System.out.println(ex.getMessage());
        }

        try{
            feedMeat(monkey);
        } catch (Exception ex){
            System.out.println(ex.getMessage());
        }

    }

}