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BookApp.java

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package version_e.q2;

import java.util.PriorityQueue;

import java.util.Scanner;

public class BookApp {

public static PriorityQueue<String> books = new PriorityQueue<>();

@SuppressWarnings("resource")

public static void main(String[] args) {

Scanner read = new Scanner(System.in);

String bookName;

String needToRemove;

do {

System.out.print("Enter the Book Name : ");

bookName = read.nextLine();

if (!bookName.equalsIgnoreCase("done")) {

addBook(bookName);

}

} while (!"done".equalsIgnoreCase(bookName));

System.out.print("Do you want to remove a book ? : ");

needToRemove = read.next();

if (needToRemove.equalsIgnoreCase("Yes")) {

System.out.print("Enter the book's name that you want to remove : ");

read.nextLine();

removeBook(read.nextLine());

}

else if (needToRemove.equalsIgnoreCase("No")) {

System.out.println("Okey");

}

else {

System.out.println("Wrong input");

}

displayBooks();

}

public static void addBook(String bookName) {

books.offer(bookName);

}

public static void removeBook(String bookName) {

if (books.contains(bookName)) {

books.remove(bookName);

System.out.println();

System.out.println("The book is removed successfully..!");

System.out.println();

}

else {

System.out.println();

System.out.println("The book is not in the this list..!");

System.out.println();

}

}

public static void displayBooks() {

System.out.println();

System.out.println("The total number of books in the list : " + books.size());

for (String displayedBook : books) {

System.out.println(displayedBook);

}

}

}