Vector print questions

Question

Dear,
I try to print out the Vector of my storage but nothing.
Please help and advise
1. add class
import java.io.*;
import java.util.*;
public class AddStudent
     public AddStudent(Vector a)
          String tempId;
          String tempName;
          float tempGpa=0f;
          try{
          InputStreamReader is = new InputStreamReader (System.in);
          BufferedReader console = new BufferedReader (is);
          System.out.print("Please enter the student number: ");
          String ans = console.readLine();
          tempId = ans ;
          //System.out.println(tempId);
          System.out.print("Please enter the student name: ");
          ans = console.readLine();
          tempName = ans ;
          System.out.print("Please enter the GPA: ");
          ans = console.readLine();
          tempGpa = Float.parseFloat(ans);
          a.addElement(new Student(tempId, tempName, tempGpa));
          }catch( java.io.IOException ex) {
          ex.printStackTrace(); }
2. Main
* This class is for testing OptionMenu class
* Also, Add, search and print Students class
import java.util.*;
import java.io.*;
public class OptionMenuTest
     public static void main(String[] args)
          //store the input student record with Vector class (included in java.util package)
          Vector studentList = new Vector();
          if (option == 1)
               AddStudent addStudent = new AddStudent(studentList);
               System.out.println("added : " + (String) studentList.elementAt(0));
3. Output. Nothing print out.
Option Menu of Student Managament Student
1) Add a new student record
2) Lookup a student record
3) Print out all student records
4) Exit program
Option: 1
Your selected option is 1
Please enter the student number: 2
Please enter the student name: a
Please enter the GPA: 2.0
Please input an option between 1 and 4!
Thanks

Answer 1

Dear
my student class as follows :
import java.io.*;
class Student
private String name ;
private String id ;
private float gpa;
     public Student(String idIn, String nameIn, float gpaIn)
     id = idIn;
     name = nameIn;
     gpa = gpaIn;
     public String getId()
     return id;
     public String getName()
     return name;
     public float getGpa()
     return gpa;