Simple Library Management System ( Updated - Add Return Feature)

//Simple Library Management System Made By Rohan Joshi

package com.company;

import java.util.*;

class librarymanagement{
     ArrayList<String> addBk = new ArrayList< >();
     HashMap<String,String> iBook  = new HashMap<>();
  public void issueBook(String Name , String Book){

        iBook.put(Name,Book);
        addBk.remove(Book);
    }
    public void preAddedBooks(){
      addBk.add("Maths");
        addBk.add("Science");
        addBk.add("English");
    }
   public void addBook( String aBook){

        addBk.add(aBook);

    }
    public void availableBook() {
        for (String avlBook : addBk) {
            System.out.println(avlBook);
        }
    }
        public void issuedBooks(){
            for(String issuedBook: iBook.keySet()){

                System.out.println("   "+issuedBook+"                                  "+iBook.get(issuedBook)+"           ");
            }
    }
    //

     private static Set<String> getKeys(HashMap<String, String> iBook, String value) {

         Set<String> result = new HashSet<>();
         if (iBook.containsValue(value)) {
             for (Map.Entry<String, String> entry : iBook.entrySet()) {
                 if (Objects.equals(entry.getValue(), value)) {
                     result.add(entry.getKey());
                 }
                 // we can't compare like this, null will throws exception
              /*(if (entry.getValue().equals(value)) {
                  result.add(entry.getKey());
              }*/
             }
         }
         return result;

     }
//     public boolean isIssuedBookEmpty(){
//         if (){
//           return true;
//         }
//     }
     public void returnBooks(String returnB){
//      boolean isIssuedYet = iBook.containsValue(returnB);

       if (!iBook.containsValue(returnB) ){
          System.out.println("Entered Book is not Issued in our Database");
      }
      else {
          addBk.add(returnB);
//      String getKeyFromValue = getKeys(iBook, returnB);
//          iBook.remove(getKeyFromValue);
           for (String getKeyFromValue : getKeys(iBook, returnB)) {
               iBook.remove(getKeyFromValue);
               System.out.println("Book Sucessfully Returned");
           }
      }
     }
}
public class library {
    public static void main(String[] args) {
        int ch;
librarymanagement lm = new librarymanagement();
        Scanner sc = new Scanner(System.in);
        System.out.println("Welcome To Library Management System");
        lm.preAddedBooks();
do {
    System.out.println("--------------------------------------------------------------");
    System.out.println("press 1 to Show Available Book");
    System.out.println("press 2 to Add book");
    System.out.println("press 3 to issue book");
    System.out.println("press 4 to see issued book");
    System.out.println("press 5 to return book");
    System.out.println("press 6 for Exit the program");
    System.out.println("--------------------------------------------------------------");
    System.out.print("Choice --> ");
    ch = sc.nextInt();
    switch (ch) {
        case 1:
            System.out.println("Displaying Available Books");
            System.out.println("--------------------------------------------------------------");
            lm.availableBook();
            System.out.println("--------------------------------------------------------------");
            break;
        case 2:
            System.out.println("Name of book you want to Add");
            String ind = sc.next();
            lm.addBook(ind);
            System.out.println("--------------------------------------------------------------");
            break;
        case 3:
            System.out.println("Enter your name");
            String name = sc.next();
            System.out.println("Currently Available Books");
            System.out.println("--------------------------------------------------------------");
            lm.availableBook();
            System.out.println("--------------------------------------------------------------");
            System.out.println("Enter Book name you want to issue");

            String bookName = sc.next();
            boolean ifavailable = lm.addBk.contains(bookName);
            if (ifavailable) {
                lm.issueBook(name, bookName);
                System.out.println("Sucessfully Book is issued");
            }
            else{
                System.out.println("Currently this book is not available");
            }
            break;
        case 4:
            System.out.println("Showing ISSUED Books By Person and the book nme");
            System.out.println("--------------------------------------------------------------");
            System.out.println("---Person---------------------------------BookName------------");
            if(lm.iBook.isEmpty()){
                System.out.println("-----------------Not Issued Any Books---------------------");
            }
            else lm.issuedBooks();
            System.out.println("--------------------------------------------------------------");

            break;
        case 5:
            if(lm.iBook.isEmpty()){
                System.out.println("Sorry Not any Book Issued to get return");
            }
        else{
            System.out.println("Book you want to return");
            String returnbook= sc.next();
            lm.returnBooks(returnbook);}
            break;
        case 6:
            System.out.println("Thanks for exiting the program.....");
            break;
        default:
            System.out.println("Please Select the correct option");
    }
}while(ch!=6);
    }
}