Question

Java assignment, abstract class, inheritance, and polymorphism.

these are the following following classes:

Animal (abstract)

• Has a name property (string)
• Has a speech property (string)
• Has a constructor that takes two arguments, the name and the speech
• It has getSpeech() and setSpeech(speech)
• It has getName and setName(name)
• It has a method speak() that prints the name of the animal and the speech.

o Example output: Tom says meow.

Mouse

• Inherits the Animal class
• Has a constructor takes a name and also pass “squeak” as speech to the super class
• Has a method chew that takes a string presenting the name of a food.

o Example output: Jerry is chewing on cheese.

Cat

• Inherits the Animal class
• Has a constructor takes a name and also pass “meow” to the super class ^•
• Has a method chase that takes a Mouse object.  

o Example output: Tom is chasing Jerry.

TomAndJerry

• Has a static method makeAnimalSpeak that takes an Animal object and makes it animal speak.
• Has a main method that
  • Create a variable of Animal type and assign it a mouse named “Jerry”
  • Create a variable of Animal type and assign it a cat named “Tom”
  • all the method makeAnimalSpeak on the animals you have created
  • Make the mouse chew on “cheese”
  • Make the cat chase the mouse

Sample run:

Jerry says squeak.

Tom says meow.

Jerry is chewing on cheese.

Tom is chasing Jerry.

Answer 1

//Java code

public abstract class Animal {
    /**
     * Has a name property (string)*/
    private String name;
    /**
     * Has a speech property (string)
     */
    private String speech;
    /**
     *  a constructor that takes two arguments,
     *  the name and the speech
     */
    public Animal(String name, String speech) {
        this.name = name;
        this.speech = speech;
    }
    //getters

    public String getName() {
        return name;
    }

    public String getSpeech() {
        return speech;
    }
    //setters

    public void setName(String name) {
        this.name = name;
    }

    public void setSpeech(String speech) {
        this.speech = speech;
    }
    /**
     * It has a method speak()
     * that prints the name of the animal and the speech.
     */
    public void speak()
    {
        System.out.println(name+" says "+speech);
    }
}

//=====================================

/**
 * Inherits the Animal class
 */
public class Mouse extends Animal{
    /**
     * a constructor takes a name and also pass
     * “squeak” as speech to the super class
     */
    public Mouse(String name)
    {
        super(name,"squeak");
    }
    /**
     *  a method chew that takes
     *  a string presenting the name of a food.
     */
    public void chew(String food)
    {
        System.out.println(getName()+" is chewing on "+food);
    }
}

//========================================

/**
 * Inherits the Animal
 */
public class Cat extends Animal {
    /**
     * a constructor takes a name and also
     * pass “meow” to the super class
     */
    public Cat(String name)
    {
        super(name,"meow");
    }

    /**
     *  a method chase that takes a Mouse object.
     * @param mouse
     */
    public void chase(Mouse mouse)
    {
        System.out.println(getName()+ " is chasing "+mouse.getName());
    }
}

//=======================================

public class TomAndJerry {
    public static void main(String[] args)
    {
        /**
         *  a variable of Animal type and assign
         *  it a mouse named “Jerry”
         */
        Animal mouse = new Mouse("Jerry");
        /**
         * a variable of Animal type and assign
         * it a cat named “Tom”
         */
        Animal cat = new Cat("Tom");
        /**
         * the method makeAnimalSpeak on
         * the animals you have created
         */
        makeAnimalSpeak(mouse);
        makeAnimalSpeak(cat);
        /**
         * the mouse chew on “cheese”
         */
        ((Mouse)mouse).chew("cheese");
        ((Cat)cat).chase((Mouse) mouse);
    }

    /**
     *  a static method makeAnimalSpeak
     *  that takes an Animal object and makes it animal speak.
     */
    private static void makeAnimalSpeak(Animal animal)
    {
        animal.speak();
    }
}

//Output

//If you need any help regarding this solution ........... please leave a comment ......... thanks