Question

Please show fully functioning java code and outputs.

Design a Java Animal class (assuming in Animal.java file) and a sub class of Animal named Cat (assuming in Cat.java file).  

The Animal class has the following protected instance variables:

boolean vegetarian, String eatings, int numOfLegs and the following public instance methods:

constructor without parameters: initialize all of the instance variables to some default values

constructor with parameters: initialize all of the instance variables to the arguments

SetAnimal: assign arguments to all of the instance variables

Three “Get” methods which retrieve the respective values of the instance variables

toString: Returns the animal’s vegetarian, eatings and numOfLegs information as a string

The Cat class has the following private instance variable:

String color and the following public instance methods:

constructor without parameters: initialize all of the instance variables to some default values, including its super class - Animal’s instance variables

constructor with parameters: initialize all of the instance variables to the arguments, including its super class Animal’s instance variables

SetColor: assign its instance variable to the argument

GetColor: retrieve the color value

overrided toString: Returns the cat’s vegetarian, eatings, numOfLegs and color information as a string

Answer 1

Animal.java

import java.util.*;
class Animal{
    boolean vegetarian;
    String eatings;
    int numOfLegs;
    //constructor without parameters
    Animal(){
        //inititlizing to default values
        vegetarian=true;
        eatings="";
        numOfLegs=4;
    }
    //constructor with parameters
    Animal(boolean vegetarian, String eatings, int numOfLegs){
        this.vegetarian=vegetarian;
        this.eatings=eatings;
        this.numOfLegs=numOfLegs;
    }

    public void setAnimal(boolean vegetarian, String eatings, int numOfLegs){
        this.vegetarian=vegetarian;
        this.eatings=eatings;
        this.numOfLegs=numOfLegs;
    }

    //get methods to return instance variables
    public boolean getVegetarian(){
        return vegetarian;
    }

    public String getEatings(){
        return eatings;
    }

    public int getNumOfLegs(){
        return numOfLegs;
    }

    public String toString(){
        return "Vegetarian: "+vegetarian+"\nEatings: "+eatings+"\nNumber of legs: "+numOfLegs;
    }

}

Cat.java

import java.util.*;
class Cat extends Animal{
    String color;

    //constructor without parameters
    Cat(){
        //this initializes super class with default values
        super(false, "milk", 4);
        //inititlizing to default values
        color="black";
    }
    //constructor with parameters
    Cat(String color, boolean vegetarian, String eatings, int numOfLegs){
        super(vegetarian, eatings, numOfLegs);
        this.color=color;
    }

    public void setColor(String color){
        this.color=color;
    }

    //get methods to return instance variables
    public String getColor(){
        return color;
    }

    public String toString(){
        return "Vegetarian: "+vegetarian+"\nEatings: "+eatings+"\nNumber of legs: "+numOfLegs + "\nColors: "+color;
    }

}

Tester.java

import java.util.*;

class Tester{
  public static void main(String[] args){
      Animal x = new Animal();
      System.out.println("Animal with Default constructor:\n" + x);
      x = new Animal(false, "grass", 4);
      System.out.println("Animal with Parameterized constructor:\n" + x);
      Cat c = new Cat();
      System.out.println("Cat with Default constructor:\n" + c);
      c = new Cat("white", false, "meat", 4);
      System.out.println("Cat with Parameterized constructor:\n" + c);
  }
}

Sample Console Output

Animal with Default constructor:
Vegetarian: true
Eatings:
Number of legs: 4
Animal with Parameterized constructor:
Vegetarian: false
Eatings: grass
Number of legs: 4
Cat with Default constructor:
Vegetarian: false
Eatings: milk
Number of legs: 4
Colors: black
Cat with Parameterized constructor:
Vegetarian: false
Eatings: meat
Number of legs: 4
Colors: white

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