Entity Bean-2 Fetch All Data

package mypack;

import java.util.Iterator;
import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Query;

public class FetchAll {
public static void main(String[] args) {
EntityManagerFactory f=GetEntity.getManagerFactory();
EntityManager em=GetEntity.getEntityManager();
//EntityTransaction t=em.getTransaction();
//t.begin();
Query q=em.createQuery("select e from Emp e where id=?");

      List<Emp> list= q.getResultList();
      Iterator<Emp> itr=list.iterator();
      System.out.println("Id\tName\tAddress\tEmail\tSalary");
     
     while(itr.hasNext()){
     Emp e=itr.next();
     System.out.println(e.getId()+"\t"+e.getName()
     +"\t"+e.getAddress()+"\t"+e.getEmail()+"\t"+e.getSalary());
   
     }
    // t.commit();
     em.close();
   
   
}
}