BookApplication

package com.alekha.modular;

import java.util.ArrayList;

public class BookDetails {
	
	private int book_id;
	private String first_Name;
	private String last_Name;
	private String book_Name;
	private String publisher_Name;
	private String language;
	private int page_No;
	
	
	public BookDetails(int book_id, String first_Name, String last_Name, String book_Name, String publisher_Name,
			String language, int page_No) {
		super();
		this.book_id = book_id;
		this.first_Name = first_Name;
		this.last_Name = last_Name;
		this.book_Name = book_Name;
		this.publisher_Name = publisher_Name;
		this.language = language;
		this.page_No = page_No;
	}
	public BookDetails(String book_Name, String language) {
	
		this.book_Name = book_Name;
		this.language = language;
	}
	public int getBook_id() {
		return book_id;
	}
	public String getFirst_Name() {
		return first_Name;
	}
	public String getLast_Name() {
		return last_Name;
	}
	public String getBook_Name() {
		return book_Name;
	}
	public String getPublisher_Name() {
		return publisher_Name;
	}
	public String getLanguage() {
		return language;
	}
	public int getPage_No() {
		return page_No;
	}
}

package com.alekha.modular;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ImplementClass {

	 List<BookDetails> l = new ArrayList<BookDetails>();
	
	

		public boolean addNewBook(BookDetails books) {
			if (findBook(books.getBook_Name()) > 0) {
				System.out.println("Name is already added");
			} else {
				l.add(books);

			}
			return true;
		}
		
		public boolean updateBook(BookDetails oldBook ,BookDetails newBook) {
			int foundPosition = findBook(oldBook);
			if(foundPosition < 0) {
				return false;
			}
			
			this.l.set(foundPosition, newBook);
			System.out.println(newBook.getBook_Name());
			return true;
		}
		
		public boolean removeBook(BookDetails book) {
			int foundPosition = findBook(book);
			if(foundPosition < 0) {
				return false;
			}
			this.l.remove(foundPosition);
			return true;
		}

		private int findBook(BookDetails name) {
			return this.l.indexOf(name);
		}
		private int findBook(String bookName) {
			 for(int i =0; i < l.size(); i++) {
				BookDetails book = this.l.get(i);
				 if(book.getBook_Name().equals(bookName)) {
					 return i;
				 }
			 }
			 return -1;
		}
		
		/*
		 * public String queryContact(Contacts contact) { if(findContact(contact) >= 0)
		 * { return contact.getName(); } return null; }
		 */
		
		public BookDetails checkBook_Name(String book_Name) {
			int position = findBook(book_Name);
			if(position >=0) {
				return this.l.get(position);
			}
			return null;
		}
		
		
		public void display() {
			System.out.println("Contact list");
			Iterator<BookDetails> itr = l.iterator();
			while(itr.hasNext()) {
			BookDetails c = itr.next();
			System.out.println(c.getBook_id()+" "+c.getFirst_Name()+" "+c.getLast_Name()+" "+c.getBook_Name()+" "+ c.getPublisher_Name()+" "+c.getLanguage()+" "+c.getPage_No());
			System.out.println(" ");
			}
		}
	}
	 

	
package com.alekha.modular;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	static ImplementClass imp = new ImplementClass();
	static BufferedReader sc = new BufferedReader(new InputStreamReader(System.in));
	public static void main(String[] args) throws IOException {	
		int choice =0;
		
		 do {
			 System.out.println("_____BookDetails Details______");
				System.out.println("1: Add a new Book");
				System.out.println("2: Update Book");
				System.out.println("3: Remove the Book");
				System.out.println("4: favourite Book");
				System.out.println("5:display the book Details");
				System.out.println("6: exit");
			choice = Integer.parseInt(sc.readLine());
			
			switch (choice) {
			case 1:
				addNewBook();
				break;
				
			case 2:
				updateBook();
				break;
			case 3:
				removeBook();
				break;
			case 4:
				//favourite();
				break;
			case 5:
				imp.display();
				break;
			default: 
				System.out.println("None of these");
 
			 
			}
		 }
			while(choice !=8);
				
	}
  private static void addNewBook() throws IOException {
	  
	  int book_id = Integer.parseInt(sc.readLine());
	  String first_Name = sc.readLine();
	  String last_Name = sc.readLine();
	  String book_Name = sc.readLine();
	  String publisher_Name = sc.readLine();
	  String language = sc.readLine();
	  int page_No = Integer.parseInt(sc.readLine());
	  BookDetails newBook = new BookDetails(book_id,first_Name,last_Name,book_Name,publisher_Name,language,page_No);
	  if(imp.addNewBook(newBook)) {
		  System.out.println("book_id = "+ book_id +" "+"first_Name = "+ first_Name+ " "+" last_Name =  "+ last_Name+" "+" book_Name = "+book_Name + " "+"pubisher_Name = "+ publisher_Name+" "+"Language = "+language+"page_No = "+ page_No );
	  }
	  else {
		  System.out.println("Already on file");
	  }
  }
	
	private static void updateBook() throws IOException {
		String bookName = sc.readLine();
		BookDetails extBook = imp.checkBook_Name(bookName);
		if(extBook == null) 
		{
			System.out.println("Cannot found contact");
			return;
		}
		
		String book_name = sc.readLine();
		String language = sc.readLine();
		BookDetails newBook = new BookDetails(book_name,language);
		if(imp.updateBook(extBook, newBook)) 
		{
			System.out.println("Successfully updated");
		}else {
			System.out.println("Error Updating Contact");
		}
	}
	
	private static void removeBook() throws IOException {
		String book_Name = sc.readLine();
		BookDetails exContact = imp.checkBook_Name(book_Name);
		if(exContact == null) 
		{
			System.out.println("Cannot found contact");
			return;
		}
		
		if(imp.removeBook(exContact)) {
			System.out.println("Successfully deleted");
		}else {
			System.out.println("Error Deleting Contact");
		}
	}
}