Question

I have a HashMap which looks like :

( student1 => Map( name => Tim,         
                   Scores => Map( math => 10,
                                  physics => 20,
                                  Computers => 30),
                    place => Miami,
                    ranking => Array(2,8,1,13),
                  ),
  student2 => Map ( 
                   ...............
                   ...............
                ),
   ............................
   ............................
);

Since the keys are not any particular type(objects, Strings, Integers etc), how can I “dive” through this complex HashMap ?

EDIT: “dive” means to iterate through each and every keys and values.

Answer 1

How about

Map<Long, Student> studentIdToStudentMap = new HashMap<Long, Student>();

and

class Student{
  private String name;
  private List<Score> scores;
  private Location location;
  private List<Rank> rankings;
  //const, equals(), hashcode(), accessors
}

and

class Score{
   private String subject;
   private float marksObtained;
   private float totalMark;
   private Long examId;
   //const, equals(), hashcode(), accessors
}

Like wise