How to print the properties in an object

I have the following method that is meant to print all the details in a hashmap (allStudents). this hashmap contains references to objects of different students.
what i need is to be able to print each object stored in allStudents, and each of those objects properties....
Please show me the light!!!
    public void printAllStudents()
    for (Integer eachStudent : allStudents) //for each loop
         System.out.println(eachStudent);// prints out every element in set
    }

Hi Kaj,
So when I overide the toString method, and then call
another method that prints out the contents of the
objects held a Map, the toString formatted text is
used? If so.. how does that work?For objects (as opposed to primitives), System.out.println() calls the toString method.

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