java - Returning values from a linked list without moving the iterator -


i have 2 classes: student , registry.registry designed hold list of students. when try return valuse of students registry class, iterator moves next student next value hence when 2 students present nosuchelemennt exception.

public string format()  {     listiterator<student> iterator              = studentlist.listiterator();      (int = 0; < studentlist.size(); i++)     {         system.out.println("if statement");         if (iterator.hasnext())         {             system.out.println("hasnext");             return string.format("%0s%0s%0s",              iterator.next().getsurname(), iterator.next().getforename(),             iterator.next().getstudentid());         }      }              return null; }

i'd return 3 values stud1, move on stud2 , on.

here link student , registry source files , tester both; https://www.dropbox.com/sh/ol2jyfbuyyjnrcg/1j4lleaqc6

i post more code if it's requested.

since answer closed, no more code , files @ link have been removed.

to iterate around list without using iterator, should use enhanced loop. code becomes - 

public string format()  { listiterator<student> iterator          = studentlist.listiterator();  (student student: studentlist) {     system.out.println("for loop");                 return string.format("%s%s%s",          student.getsurname(), student.getforename(),         student.getstudentid());       }     return null;    }

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