diff --git a/src/model/GraduateStudent.java b/src/model/GraduateStudent.java
index 684010e..9bcbb92 100644
--- a/src/model/GraduateStudent.java
+++ b/src/model/GraduateStudent.java
@@ -3,11 +3,15 @@
 public class GraduateStudent extends Student {
   private String supervisor;
   private String thesisTitle;
-
   @Override
   public void getStudentDetails() {
     // TODO: Implement method 'getStudentDetails' for GraduateStudent.
     throw new UnsupportedOperationException("Unimplemented method 'getStudentDetails'");
   }
-
+public GraduateStudent(String studentId,String firstName,String lastName,String major,String supervisor,String thesisTitle)
+{
+      super(studentId, firstName, lastName, major);
+      this.supervisor=supervisor;
+      this.thesisTitle=thesisTitle;
+}
 }
diff --git a/src/model/Loan.java b/src/model/Loan.java
index 9f283c4..eec35bc 100644
--- a/src/model/Loan.java
+++ b/src/model/Loan.java
@@ -8,23 +8,26 @@ public class Loan {
   private Date loanDate;
   private Date dueDate;
 
-  public void getBook() {
-    // TODO: Implement method 'getBook'.
-    throw new UnsupportedOperationException("Unimplemented method 'getBook'");
-  }
 
-  public void getStudent() {
-    // TODO: Implement method 'getStudent'.
-    throw new UnsupportedOperationException("Unimplemented method 'getStudent'");
-  }
 
-  public void getLoanDate() {
-    // TODO: Implement method 'getLoanDate'.
-    throw new UnsupportedOperationException("Unimplemented method 'getLoanDate'");
+  public Loan(Book book,Student student,Date loanDate,Date dueDate){
+   this.book=book;
+   this.student=student;
+   this.loanDate=loanDate;
+   this.dueDate=dueDate;
   }
 
-  public void getDueDate() {
-    // TODO: Implement method 'getDueDate'.
-    throw new UnsupportedOperationException("Unimplemented method 'getDueDate'");
-  }
+
+
+//Seterr
+  public void    setBook     (Book book)       {this.book=book;}
+  public void    setStudent  (Student student) {this.student=student;}
+  public void    setLoanDate (Date loanDate)   {this.loanDate=loanDate;}
+  public void    setDueDate  (Date dueDate)    {this.dueDate=dueDate;}
+//getter
+  public Book    getBook()     {return this.book;}
+  public Student getStudent()  {return this.student;}
+  public Date    getLoanDate() {return this.loanDate;}
+  public Date    getDueDate()  {return this.dueDate;}
+
 }
diff --git a/src/model/Student.java b/src/model/Student.java
index 37e4122..13e7dd1 100644
--- a/src/model/Student.java
+++ b/src/model/Student.java
@@ -1,10 +1,16 @@
 package model;
 
 public abstract class Student {
-  private String studentId;
-  private String firstName;
-  private String lastName;
-  private String major;
-
-  public abstract void getStudentDetails();
+  protected  String studentId;
+  protected  String firstName;
+  protected  String lastName;
+  protected  String major;
+public Student(String studentId,String firstName,String lastName,String major)
+{
+      this.studentId=studentId;
+      this.firstName=firstName;
+      this.lastName=lastName;
+      this.major=major;
 }
+  public abstract void getStudentDetails();
+}
\ No newline at end of file
diff --git a/src/model/UndergraduateStudent.java b/src/model/UndergraduateStudent.java
index 21122f4..df19fce 100644
--- a/src/model/UndergraduateStudent.java
+++ b/src/model/UndergraduateStudent.java
@@ -8,4 +8,11 @@ public void getStudentDetails() {
     // TODO: Implement method 'getStudentDetails' for UndergraduateStudent.
     throw new UnsupportedOperationException("Unimplemented method 'getStudentDetails'");
   }
+
+    public UndergraduateStudent(String studentId,String firstName,String lastName,String major,int enrollmentYear)
+    {
+        super(studentId,firstName,lastName,major);
+        this.enrollmentYear=enrollmentYear;
+    }
+
 }