Modify the Cage class to implement Comparable.

Question

The definition of the Comparable interface can be found here. Remember that Comparable has one abstract method, int compareTo(T o). Two Cages can be compared based on their size obtained via getSize(). You must (1) implement the interface, and (2) define the compareTo method.

public class Cage <P extends Pet> {

private int size;

private P pet;

public Cage(P p, int s) {

size = s;

pet = p;

}

public boolean checkSize() {

if (pet.getSize() > size) {

return false;

}

return true;

}

public int getSize() {

return size;

}

public P getPet() {

return pet;

}

}

Answer 1

class P

{

protected int size;

public P (int s) { size = s; }

public int getSize() { return(size); }

P(P p)

{

this.size = p.size;

}

}

/***************************************/

interface Comparable

{

public int compareTo(Object o);

}

/*************************************************/

class Cage extends P implements Comparable

{

private int size;

private P pet;

public Cage(P p, int s)

{

super(p);

this.size = s;

}

public int compareTo(Object o)

{

Cage cage = (Cage) o;

return (

this.size - cage.getSize()

);

}

public boolean checkSize()

{

return (pet.getSize() <= this.size);

}

@Override public int getSize() { return(this.size); }

public P getPet()

{

return new P(pet);

}

public int GetPetSize()

{

return(this.pet.getSize());

}

}

/******************************************************/

class PetCageMain

{

public static void main(String args[])

{

P pet1 = new P(10);

P pet2 = new P(15);

P pet3 = new P(12);

P pet4 = new P(15);

Cage cage1 = new Cage(pet1,15);

Cage cage2 = new Cage(pet2,20);

Cage cage3 = new Cage(pet4,25);

Cage cage4 = new Cage(pet3,20);

System.out.println(cage1.compareTo((Object)cage2)); // -5

System.out.println(cage3.compareTo((Object)cage2)); // 5

System.out.println(cage4.compareTo((Object)cage2)); // 0

}

}