java - Access all elements of an arraylist from an object which is stored in an arraylist (2 Dimentional) -

so have several "student" objects in arraylist, each student has arraylist of courses. how access of courses particular student? in advance.

scanner studentcourse = new scanner(system.in); int j = 0;  system.out.println("which students course(s) want view?"); for(student l:liststudent) {     system.out.print(j+1 + ")");     system.out.println(l);     j++; } int course = studentcourse.nextint();  int k = s.listcourse.size();//need size of correct array list int l = 0;  while( l < k ){     system.out.println(s.listcourse.get(0));//need print of elements in correct array list }  break;  public class student {      string studentfirstname, studentlastname;     int studentid;     double studentgpa;     arraylist<course> listcourse = new arraylist<>();  } 

your question understandable, not code.

student student = studentlist.get(indexposition);  //arraylist gives flexibility , that's advantage of arraylist on other lists  if(student.getcourseslist()!=null && !student.getcourseslist().isempty()){     for(course course: student.getcourseslist()){         system.out.println(course);     } }