Class Code 9/13/17

PetableEx.java

interface Petable {
    public void pet();
}

class Cat implements Petable{
    private void purr(){
        System.out.println("Purr");
    }
    
    public void pet(){
        purr();
    }
}

public class PetableEx {}

interface Petable {

public void pet();

}

class Cat implements Petable{

private void purr(){

System.out.println("Purr");

}

public void pet(){

purr();

}

public class PetableEx {}

InterfaceEx.java

import java.util.ArrayList;

interface Pet { } // A marker interface

class Animal { }

class Whale extends Animal { }

class Cat extends Animal implements Pet { }

class Dog extends Animal implements Pet { }

class Human extends Animal {
    private ArrayList<Pet> pets; 

    public void adoptPet(Pet p){
        pets.add(p);
    }
}

public class InterfaceEx {
    public static void main(String[] args){
        Human h = new Human();
        h.adoptPet(new Cat()); 
    }   
}

import java.util.ArrayList;

interface Pet { } // A marker interface

class Animal { }

class Whale extends Animal { }

class Cat extends Animal implements Pet { }

class Dog extends Animal implements Pet { }

class Human extends Animal {

private ArrayList<Pet> pets;

public void adoptPet(Pet p){

pets.add(p);

}

public class InterfaceEx {

public static void main(String[] args){

Human h = new Human();

h.adoptPet(new Cat());

}

Hi There!

PetableEx.java

InterfaceEx.java