done

Answers/LMS/src/main/java/org/example/Admin.java

@@ -0,0 +1,13 @@
+package org.example;
+
+public class Admin extends User {
+    private String _Password;
+    public String get_Password() {
+        return _Password;}
+
+    public Admin(String Name, long Unique_ID, String Phone_number ,String Password) {
+        super( Name , Unique_ID , Phone_number);
+        _Password = Password;
+    }
+
+}

Answers/LMS/src/main/java/org/example/Book.java

@@ -0,0 +1,42 @@
+package org.example;
+
+public class Book {
+    private int _bookID;
+    public int get_bookID() {
+        return _bookID;}
+    public void set_bookID(int bookID) {
+        _bookID= bookID;}
+
+    private String _Title;
+    public String get_Title() {
+        return _Title;}
+    public void set_Title(String title) {
+        _Title= title;}
+
+    private String _Author;
+    public String get_Author() {
+        return _Author;}
+    public void set_Author(String author) {
+        _Author= author;}
+    private boolean _Availability_status;
+    public boolean get_Availability() {
+        return _Availability_status;}
+    public void set_Availability(boolean Availability) {
+        _Availability_status= Availability;}
+    private String _Description;
+    public String get_Description() {
+        return _Description;}
+    public void set_Description(String description) {
+        _Description= description;}
+
+    public Book(int bookID, String Title, String Author, boolean Availability_status, String Description) {
+        _bookID = bookID;
+        _Title = Title;
+        _Author = Author;
+        _Availability_status = Availability_status;
+        _Description = Description;
+
+    }
+
+}
+