Answered: Write the Talker interface, Animal…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write the Talker interface, Animal abstract class, plus the Dog, Cat, Fish, and Radio classes for this Java Program.

Talker.java - the interface Talker, which has just one void method called speak()
Animal.java - the abstract class Animal, which stores an animal's name. (No abstract methods). It should contain 2 methods:
- a constructor with 1 argument (the name)
- a method getName() which returns the name.
Dog.java - the class Dog, which extends Animal and implements Talker. It should contain 3 methods:
- a constructor with no arguments, giving the dog a default name of "Fido"
- a constructor with 1 argument (the name)
- a speak() method that prints "Woof" on the screen. Use @Override
Cat.java - the class Cat, which extends Animal and implements Talker. It should contain just 2 methods:
- a constructor with 1 argument (the name) (no default name like dogs have)
- a speak() method that prints "Meow" on the screen. Use @Override
Fish.java - the class Fish, which is an Animal that doesn't talk. So it only needs 1 constructor (with its name).
Radio.java - the class Radio, which is a Talker, but not an animal. Its @Override speak() method should print "blahblahblah"

Code:

import java.util.Scanner;

import java.util.ArrayList;

class Main

{

publicstaticvoid main(String[] args)

{

Scanner keyIn = new Scanner(System.in);

ArrayList<Talker> chatterbox = new ArrayList<Talker>();

ArrayList<Animal> menagerie = new ArrayList<Animal>();

String name, kind, another;

{

System.out.print("What do you have? Enter 'd' for dog, 'c' for cat, 'f' for fish, or 'r' for radio: ");

kind = keyIn.nextLine();

switch(kind.charAt(0))

{

case'd': case'D':

Dog doggy;

System.out.print("What is your dog's name? ");

name = keyIn.nextLine();

if(name.length() < 1)

doggy = new Dog();

else

doggy = new Dog(name);

chatterbox.add(doggy);

menagerie.add(doggy);

break;

case'c': case'C':

System.out.print("What is your cat's name? ");

name = keyIn.nextLine();

Cat myCat = new Cat(name);

chatterbox.add(myCat);

menagerie.add(myCat);

break;

case'f': case'F':

System.out.print("What is your fish's name? ");

name = keyIn.nextLine();

menagerie.add(new Fish(name));

break;

case'r': case'R':

chatterbox.add(new Radio());

break;

default:

System.out.println("Invalid entry.");

}

System.out.print("Do you want to enter another? Type y or n: ");

another = keyIn.nextLine();

}while(another.charAt(0) == 'y');

greet(menagerie);

cacophony(chatterbox);

}

// Greet each of the animals

privatestaticvoid greet(ArrayList<Animal> animals)

{

for(Animal a : animals)

{

System.out.println("Hello " + a.getName());

}

// Let each of the talkers speak...

privatestaticvoid cacophony(ArrayList<Talker> talkers)

{

for(Talker t : talkers)

{

t.speak();

System.out.println();

}

/* Sample Output when all the other classes have been written:

What do you have? Enter 'd' for dog, 'c' for cat, 'f' for fish, or 'r' for radio: d

What is your dog's name?