diff --git a/library2 - Copy (2)/library2.iml b/library2 - Copy (2)/library2.iml
new file mode 100644
index 0000000..9465dd8
--- /dev/null
+++ b/library2 - Copy (2)/library2.iml	
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/library2 - Copy (2)/out/production/library2/Book.class b/library2 - Copy (2)/out/production/library2/Book.class
new file mode 100644
index 0000000..a6d9773
Binary files /dev/null and b/library2 - Copy (2)/out/production/library2/Book.class differ
diff --git a/library2 - Copy (2)/out/production/library2/Librarian.class b/library2 - Copy (2)/out/production/library2/Librarian.class
new file mode 100644
index 0000000..855773c
Binary files /dev/null and b/library2 - Copy (2)/out/production/library2/Librarian.class differ
diff --git a/library2 - Copy (2)/out/production/library2/Library.class b/library2 - Copy (2)/out/production/library2/Library.class
new file mode 100644
index 0000000..3863171
Binary files /dev/null and b/library2 - Copy (2)/out/production/library2/Library.class differ
diff --git a/library2 - Copy (2)/out/production/library2/Main.class b/library2 - Copy (2)/out/production/library2/Main.class
new file mode 100644
index 0000000..83d22ac
Binary files /dev/null and b/library2 - Copy (2)/out/production/library2/Main.class differ
diff --git a/library2 - Copy (2)/out/production/library2/User.class b/library2 - Copy (2)/out/production/library2/User.class
new file mode 100644
index 0000000..b5280a3
Binary files /dev/null and b/library2 - Copy (2)/out/production/library2/User.class differ
diff --git a/library2 - Copy (2)/out/production/library2/users.class b/library2 - Copy (2)/out/production/library2/users.class
new file mode 100644
index 0000000..aee765f
Binary files /dev/null and b/library2 - Copy (2)/out/production/library2/users.class differ
diff --git a/library2 - Copy (2)/src/Book.java b/library2 - Copy (2)/src/Book.java
new file mode 100644
index 0000000..add791c
--- /dev/null
+++ b/library2 - Copy (2)/src/Book.java	
@@ -0,0 +1,33 @@
+import java.util.Scanner;
+
+public class Book {
+
+        public int isbn;
+        public String bookName;
+        public String authorName;
+        public String publishYear;
+        public int bookQty;
+        public int bookQtyCopy;
+
+        Scanner input = new Scanner(System.in);
+
+        public Book()
+        {
+            System.out.println("Enter Serial No of Book:");
+            this.isbn = input.nextInt();
+            input.nextLine();
+
+            System.out.println("Enter Book Name:");
+            this.bookName = input.nextLine();
+
+            System.out.println("Enter Author Name:");
+            this.authorName = input.nextLine();
+
+            System.out.println("Enter publish year:");
+            this.publishYear = input.nextLine();
+
+            System.out.println("Enter Quantity of Books:");
+            this.bookQty = input.nextInt();
+            bookQtyCopy = this.bookQty;
+        }
+}
diff --git a/library2 - Copy (2)/src/Librarian.java b/library2 - Copy (2)/src/Librarian.java
new file mode 100644
index 0000000..208dca4
--- /dev/null
+++ b/library2 - Copy (2)/src/Librarian.java	
@@ -0,0 +1,20 @@
+import java.util.Scanner;
+
+public class Librarian {
+
+    String libName;
+    String libPass;
+    Scanner input = new Scanner(System.in);
+
+    public Librarian()
+    {
+        System.out.println("Enter librarian name:");
+
+        this.libName = input.nextLine();
+
+        System.out.println("Enter librarian password:");
+
+        this.libPass = input.nextLine();
+    }
+
+}
diff --git a/library2 - Copy (2)/src/Library.java b/library2 - Copy (2)/src/Library.java
new file mode 100644
index 0000000..ede40e2
--- /dev/null
+++ b/library2 - Copy (2)/src/Library.java	
@@ -0,0 +1,229 @@
+import java.util.Scanner;
+
+public class Library {
+
+    public int BOOKcapacity;
+    Book theBooks[] = new Book[BOOKcapacity];
+
+
+    public static int count;
+
+    Scanner input = new Scanner(System.in);
+
+    public void askingForBookCapacity(){
+
+        System.out.println("PLEASE ENTER THE CAPACITY OF YOUR LIBRARY FOR ADDING BOOKS");
+
+        BOOKcapacity = input.nextInt();
+    }
+
+
+    public int compareBookObjects(Book b1, Book b2){
+
+        if (b1.bookName.equalsIgnoreCase(b2.bookName)){
+
+            System.out.println("Book of this Name Already Exists.");
+
+            return 0;
+
+        }
+
+        if (b1.isbn == b2.isbn){
+
+            System.out.println("Book of this Serial No Already Exists.");
+
+            return 0;
+
+        }
+
+        return 1;
+
+    }
+
+
+    public void addBook(Book b) {
+
+        for (int i = 0; i < count; i++) {
+
+            if (this.compareBookObjects(b, this.theBooks[i]) == 0)
+
+                return;
+        }
+
+        if (count < BOOKcapacity){
+
+            theBooks[count] = b;
+
+            count++;
+        }
+
+        else{
+
+            System.out.println("No Space to Add More Books.");
+        }
+
+    }
+
+    public void searchByISBN(){
+
+        System.out.println("SEARCH BY SERIAL NUMBER");
+
+        int ISBN;
+
+        System.out.println("Enter ISBN of Book:");
+
+        ISBN = input.nextInt();
+
+        int flag = 0;
+
+        System.out.println("ISBN - Name - Author - Available Qty - Total Qty - publish year");
+
+        for (int i = 0; i < count; i++){
+
+            if (ISBN == theBooks[i].isbn){
+
+                System.out.println(theBooks[i].isbn + "\t\t" + theBooks[i].bookName + "\t\t" + theBooks[i].authorName + "\t\t" + theBooks[i].bookQtyCopy + "\t\t" + theBooks[i].bookQty + "\t\t" + theBooks[i].publishYear);
+
+                flag++;
+
+            }
+        }
+
+        if (flag == 0){
+
+            System.out.println("No Book for ISBN " + ISBN + " Found.");
+        }
+
+    }
+
+
+    public void searchByAuthorName(){
+
+        System.out.println("SEARCH BY AUTHOR'S NAME");
+
+        System.out.println("Enter Author Name:");
+
+        String authorName = input.nextLine();
+
+        int flag = 0;
+
+        System.out.println("ISBN - Name - Author - Available Qty - Total Qty - publish year");
+
+        for (int i = 0; i < count; i++) {
+
+            if (authorName.equalsIgnoreCase(theBooks[i].authorName)){
+
+                System.out.println(theBooks[i].isbn + "\t\t" + theBooks[i].bookName + "\t\t" + theBooks[i].authorName + "\t\t" + theBooks[i].bookQtyCopy + "\t\t" + theBooks[i].bookQty + "\t\t" + theBooks[i].publishYear);
+
+                flag++;
+
+            }
+
+        }
+
+
+        if (flag == 0){
+
+            System.out.println("No Books of " + authorName + " Found.");
+        }
+
+    }
+
+    public void showAllBooks(){
+
+        System.out.println("SHOWING ALL BOOKS");
+
+        System.out.println("ISBN - Name - Author - Available Qty - Total Qty - publish year");
+
+        for (int i = 0; i < count; i++) {
+
+            System.out.println(theBooks[i].isbn + "\t\t" + theBooks[i].bookName + "\t\t" + theBooks[i].authorName + "\t\t" + theBooks[i].bookQtyCopy + "\t\t" + theBooks[i].bookQty + "\t\t" + theBooks[i].publishYear);
+
+        }
+
+    }
+
+
+    public void changeBookQty(){
+
+        System.out.println("CHANGE QUANTITY OF A BOOK\n");
+
+        System.out.println("Enter ISBN of Book");
+
+        int ISBN = input.nextInt();
+
+        for (int i = 0; i < count; i++){
+
+            if (ISBN == theBooks[i].isbn){
+
+                System.out.println("Enter Number of Books to be Added or Removed \n ATTENTION: if you want to increase just type a positive number like \n2 and if you want to decrease write a negative number like -2 ");
+
+                int addingQty = input.nextInt();
+
+                theBooks[i].bookQty += addingQty;
+
+                theBooks[i].bookQtyCopy += addingQty;
+
+                return;
+            }
+        }
+    }
+
+    public int doesBookExists(int ISBN){
+
+        for (int i = 0; i < count; i++){
+
+            if (ISBN == theBooks[i].isbn){
+
+                if (theBooks[i].bookQtyCopy > 0){
+
+                    System.out.println("Book exists.");
+
+                    return i;
+                }
+
+                System.out.println("Book does not exist");
+
+                return -1;
+            }
+        }
+
+        System.out.println("No Book of ISBN " + " Available in Library.");
+
+        return -1;
+    }
+
+
+    public Book removeBook(){
+
+        System.out.println("Enter ISBN of Book to be Checked Out.");
+
+        int ISBN = input.nextInt();
+
+        int bookIndex = doesBookExists(ISBN);
+
+        if (bookIndex != -1){
+
+            theBooks[bookIndex].bookQtyCopy--;
+
+            return theBooks[bookIndex];
+
+        }
+
+        return null;
+
+    }
+
+
+    public void returnBook(Book b){
+
+        for (int i = 0; i < count; i++){
+
+            if (b.equals(theBooks[i])){
+
+                theBooks[i].bookQtyCopy++;
+
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/library2 - Copy (2)/src/Main.java b/library2 - Copy (2)/src/Main.java
new file mode 100644
index 0000000..d79c593
--- /dev/null
+++ b/library2 - Copy (2)/src/Main.java	
@@ -0,0 +1,129 @@
+import java.util.Scanner;
+
+public class Main {
+
+
+    public static void main(String[] args){
+
+        Scanner input = new Scanner(System.in);
+
+
+        System.out.println("**********************************************************************");
+        System.out.println("				         WELLCOME TO THE LIBRARY			 ");
+        System.out.println("**********************************************************************");
+
+
+
+        Library ob = new Library();
+
+        users obUser = new users();
+
+        Library bookCapacity = new Library();
+
+        bookCapacity.askingForBookCapacity();
+
+        users usersCapacity = new users();
+
+        usersCapacity.askingForUsersCapacity();
+
+        int choice;
+
+        int searchChoice;
+
+        do {
+
+            dispMenu();
+
+            choice = input.nextInt();
+
+
+            switch (choice) {
+
+
+                case 1:
+                    Book b = new Book();
+                    ob.addBook(b);
+                    break;
+
+
+                case 2:
+                    ob.changeBookQty();
+                    break;
+
+
+                case 3:
+
+                    System.out.println(" press 1 to Search with Book Serial No.");
+                    System.out.println(" Press 2 to Search with Book's Author Name.");
+                    searchChoice = input.nextInt();
+
+
+                    switch (searchChoice) {
+
+
+                        case 1:
+                            ob.searchByISBN();
+                            break;
+
+
+                        case 2:
+                            ob.searchByAuthorName();
+                    }
+
+                    break;
+
+
+                case 4:
+                    ob.showAllBooks();
+                    break;
+
+
+                case 5:
+                    User s = new User();
+                    obUser. addUsers(s);
+                    break;
+
+
+                case 6:
+                    obUser.showAllUsers();
+                    break;
+
+
+                case 7:
+                    obUser.rentBook(ob);
+                    break;
+
+
+                case 8:
+                    obUser.returnBook(ob);
+                    break;
+
+
+                default:
+
+                    System.out.println("Thanks for Choosing Us !");
+            }
+
+        }
+
+
+        while (choice != 0);
+    }
+
+    static void dispMenu(){
+
+        // Displaying menu
+        System.out.println("----------------------------------------------------------------------------------------------------------");
+        System.out.println("Press 1 to Add new Book.");
+        System.out.println("Press 2 to Change Quantity of a Book.");
+        System.out.println("Press 3 to Search a Book.");
+        System.out.println("Press 4 to Show All Books.");
+        System.out.println("Press 5 to Register user.");
+        System.out.println("Press 6 to Show All Registered users.");
+        System.out.println("Press 7 to Borrow or Remove Book. ");
+        System.out.println("Press 8 to Return Book");
+        System.out.println("Press 0 to Exit Application.");
+        System.out.println("-------------------------------------------------------------------------------------------------------");
+    }
+
+}
diff --git a/library2 - Copy (2)/src/User.java b/library2 - Copy (2)/src/User.java
new file mode 100644
index 0000000..0b0e538
--- /dev/null
+++ b/library2 - Copy (2)/src/User.java	
@@ -0,0 +1,23 @@
+import java.util.Scanner;
+
+public class User {
+
+    String userName;
+    String passWord;
+
+    Book borrowedBooks[] = new Book[3];
+    public int booksCount = 0;
+
+    Scanner input = new Scanner(System.in);
+
+    public User()
+    {
+        System.out.println("Enter username:");
+
+        this.userName = input.nextLine();
+
+        System.out.println("Enter password:");
+
+        this.passWord = input.nextLine();
+    }
+}
diff --git a/library2 - Copy (2)/src/users.java b/library2 - Copy (2)/src/users.java
new file mode 100644
index 0000000..5fc39e5
--- /dev/null
+++ b/library2 - Copy (2)/src/users.java	
@@ -0,0 +1,162 @@
+ 
+import java.util.Scanner;
+ 
+public class users {
+    
+    public int USERcapacity;
+
+    User theUsers[] = new User[USERcapacity];
+    Scanner input = new Scanner(System.in);
+    
+    public static int count = 0;
+    
+
+    public void askingForUsersCapacity(){
+
+        System.out.println("PLEASE ENTER THE CAPACITY OF YOUR LIBRARY FOR USERS");
+
+        USERcapacity = input.nextInt();
+    }
+    public void addUsers(User u){
+
+        for (int i = 0; i < count; i++) {
+
+            if (u.passWord.equalsIgnoreCase(theUsers[i].passWord)){
+                
+                System.out.println("password " + u.passWord + " is Already Registered.");
+
+                return;
+            }
+        }
+
+        if (count <= USERcapacity){
+
+            theUsers[count] = u;
+
+            count++;
+        }
+    }
+    
+    public void showAllUsers() {
+         
+        System.out.println("username----password");
+
+        for (int i = 0; i < count; i++){
+
+                System.out.println(theUsers[i].userName + "     " + theUsers[i].passWord);
+
+        }
+
+    }
+    
+    public int doesUserExist(){
+         
+        System.out.println("Enter password:");
+
+        String pass = input.nextLine();
+
+        for (int i = 0; i < count; i++){
+
+            if (theUsers[i].passWord.equalsIgnoreCase(pass)){
+
+                return i;
+
+            }
+
+        }
+
+         
+        System.out.println("user is not Registered.");
+
+        System.out.println("Get Registered First.");
+
+        return -1;
+    }
+
+     
+    public void rentBook(Library book){
+
+        int userIndex = this.doesUserExist();
+
+        if (userIndex != -1){
+
+            System.out.println("renting...");
+
+            book.showAllBooks();
+
+            Book b = book.removeBook();
+
+            System.out.println("renting...");
+
+            if (b != null){
+
+                if (theUsers[userIndex].booksCount <= 3){
+
+                    System.out.println("adding book");
+
+                    theUsers[userIndex].borrowedBooks[theUsers[userIndex].booksCount] = b;
+
+                    theUsers[userIndex].booksCount++;
+
+                    return;
+
+                }
+
+                else{
+
+                    System.out.println("user Can not Borrow more than 3 Books.");
+
+                    return;
+
+                }
+
+            }
+
+            System.out.println("Book is not Available.");
+        }
+
+
+    }
+
+    public void returnBook(Library book){
+
+        int userIndex = this.doesUserExist();
+
+        if (userIndex != -1){
+
+            System.out.println("ISBN   Book Name   Author Name");
+
+            User u = theUsers[userIndex];
+
+            for (int i = 0; i < u.booksCount; i++){
+
+                System.out.println(u.borrowedBooks[i].isbn + "\t\t\t" + u.borrowedBooks[i].bookName + "\t\t\t" + u.borrowedBooks[i].authorName);
+
+            }
+
+            System.out.println("Enter ISBN of Book to be Checked In:");
+
+            int ISBN = input.nextInt();
+
+            for (int i = 0; i < u.booksCount; i++){
+
+                if (ISBN == u.borrowedBooks[i].isbn){
+
+                    book.returnBook(u.borrowedBooks[i]);
+
+                    u.borrowedBooks[i] = null;
+
+                    return;
+
+                }
+
+
+            }
+
+            System.out.println("Book of ISBN " + ISBN + "not Found");
+
+        }
+
+    }
+
+}