It has just one Main class which tests abstract class Animal and its 3 subclasses: Dog, Cat, and Fish. It also tests the Talkers: Dog, Cat, and Radio. So your job is to write all 6 of these simple classes (they should be less than one page each) :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 @OverrideCat.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 @OverrideFish.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"When you have done all of the above correctly, the program should produce output like the sample shown at bottom of Main. Do not change Main.java. This Main class tests abstract class Animal and its 3 subclasses:Dog, Cat, and Fish.It also tests the Talkers: Dog, Cat, and Radio.Your job is write the Talker interface, Animal abstract class,plus the Dog, Cat, Fish, and Radio classesto make this program work, so it produces output likethe sample shown at bottom.DO NOT CHANGE THIS FILE.*/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;do{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();elsedoggy = 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 animalsprivatestaticvoid 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: dWhat is your dog's name?Do you want to enter another? Type y or n: yWhat do you have? Enter 'd' for dog, 'c' for cat, 'f' for fish, or 'r' for radio: dWhat is your dog's name? FrannyDo you want to enter another? Type y or n: yWhat do you have? Enter 'd' for dog, 'c' for cat, 'f' for fish, or 'r' for radio: fWhat is your fish's name? BubblesDo you want to enter another? Type y or n: yWhat do you have? Enter 'd' for dog, 'c' for cat, 'f' for fish, or 'r' for radio: cWhat is your cat's name? TigerDo you want to enter another? Type y or n: yWhat do you have? Enter 'd' for dog, 'c' for cat, 'f' for fish, or 'r' for radio: rDo you want to enter another? Type y or n: yWhat do you have? Enter 'd' for dog, 'c' for cat, 'f' for fish, or 'r' for radio: dWhat is your dog's name? JennyDo you want to enter another? Type y or n: nHello FidoHello FrannyHello BubblesHello TigerHello JennyWoofWoofMeowblahblahblahWoof*/

Question given: A program code is given of driver class. Write all classes and their method that are used in this driver class. Solution: Programming language used: Java all solution steps are included in program codes of each file. Program code of Talker.java file: // create interface Talker interface Talker{ // define method speak that return none void speak(); } Snapshots of program code of Talker.java file: Program code of Dog.java file: // create class Dog which extends Animal and implements Talker class Dog extends Animal implements Talker{ // create class default constructor Dog(){ // initialise superclass constructor by default value super("Fido"); } // create constructor with one argument Dog(String name){ // initialise superclass constructor by argument passed super(name); } // override Talker inteface speak method @Override public void speak(){ System.out.println("Woof"); } } Snapshots of program code of Dog.java file: Program code of Cat.java file: // create class Cat which extends Animal and implements Talker class Cat extends Animal implements Talker{ // create constructor with one argument Cat(String name){ // initialise superclass constructor by argument passed super(name); } // override Talker inteface speak method @Override public void speak(){ System.out.println("Meow"); } } Snapshots of program code of Cat.java file: Program code of Fish.java file: // create class Fish which extends Animal class Fish extends Animal{ // create class constructor that accept a parameter Fish(String name){ // initialise superclass constructor with this paramter super(name); } } Snapshots of program code of Fish.java file: Program code of Radio.java file: // create class Cat which implements Talker class Radio implements Talker{ // override Talker inteface speak method @Override public void speak(){ System.out.println("blahblahblah"); } } Snapshots of program code of Radio.java file: Snapshots of output of complete program when all class files are implemented:

Answered: It has just one Main class which tests…

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

It has just one Main class which tests abstract class Animal and its 3 subclasses: Dog, Cat, and Fish. It also tests the Talkers: Dog, Cat, and Radio. So your job is to write all 6 of these simple classes (they should be less than one page each) :

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"

When you have done all of the above correctly, the program should produce output like the sample shown at bottom of Main. Do not change Main.java.

This Main class tests abstract class Animal and its 3 subclasses:

Dog, Cat, and Fish.

It also tests the Talkers: Dog, Cat, and Radio.

Your job is write the Talker interface, Animal abstract class,

plus the Dog, Cat, Fish, and Radio classes

to make this program work, so it produces output like

the sample shown at bottom.

DO NOT CHANGE THIS FILE.

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?