1.Below is the code for SingletonEcercise.java file 2.i have attached a picture for instructions 3. kindly include comments when editing the file so that i can have a better understanding . import java.util.*; enum Suit { SPADES, HEARTS, CLUBS, DIAMONDS } class Card { public Card(Suit s, int n) { suit = s; if((n < 2) || (n > 14)) { throw new IllegalArgumentException( ); } number = n; } public void print( ) { switch(number) { case 11: System.out.print("Jack"); break; case 12: System.out.print("Queen"); break; case 13: System.out.print("King"); break; case 14: System.out.print("Ace"); break; default: System.out.print(number); break; } System.out.print(" of "); switch(suit) { case SPADES: System.out.println("spades."); break; case HEARTS: System.out.println("hearts."); break; case CLUBS: System.out.println("clubs."); break; case DIAMONDS: System.out.println("diamonds."); break; } } private Suit suit; private int number; } class Deck { public Deck( ) { cards = new ArrayList( ); // build the deck Suit[] suits = {Suit.SPADES, Suit.HEARTS, Suit.CLUBS, Suit.DIAMONDS}; for(Suit suit: suits) { for(int i = 2; i <= 14; i++) { cards.add(new Card(suit, i)); } } // shuffle it! Collections.shuffle(cards, new Random( )); } public void print( ) { for(Card card: cards) { card.print( ); } } private List cards; } public class SingletonExercise { public static void main(String args[]) { Deck deck = new Deck( ); deck.print( ); } }

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

1.Below is the code for SingletonEcercise.java file

2.i have attached a picture for instructions

3. kindly include comments when editing the file so that i can have a better understanding .

import java.util.*;

enum Suit {
SPADES,
HEARTS,
CLUBS,
DIAMONDS
}

class Card {
public Card(Suit s, int n) {
suit = s;
if((n < 2) || (n > 14)) {
throw new IllegalArgumentException( );
}
number = n;
}

public void print( ) {
switch(number) {
case 11:
System.out.print("Jack");
break;
case 12:
System.out.print("Queen");
break;
case 13:
System.out.print("King");
break;
case 14:
System.out.print("Ace");
break;
default:
System.out.print(number);
break;
}
System.out.print(" of ");
switch(suit) {
case SPADES:
System.out.println("spades.");
break;
case HEARTS:
System.out.println("hearts.");
break;
case CLUBS:
System.out.println("clubs.");
break;
case DIAMONDS:
System.out.println("diamonds.");
break;
}
}

private Suit suit;
private int number;
}

class Deck {
public Deck( ) {
cards = new ArrayList<Card>( );

// build the deck
Suit[] suits = {Suit.SPADES, Suit.HEARTS, Suit.CLUBS, Suit.DIAMONDS};
for(Suit suit: suits) {
for(int i = 2; i <= 14; i++) {
cards.add(new Card(suit, i));
}
}

// shuffle it!
Collections.shuffle(cards, new Random( ));
}

public void print( ) {
for(Card card: cards) {
card.print( );
}
}

private List<Card> cards;
}

public class SingletonExercise {
public static void main(String args[]) {
Deck deck = new Deck( );
deck.print( );
}
}

Compulsory Task 1
Follow these steps:
●
Download the Singleton Exercise.java file.
Change the Deck class into a Singleton class.
Change the main method to get the Deck instance rather than creating a
new object.
The program should print all 52 cards in random order.

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