Java Heap Profile
-----------------------
________________Size__Instances__Class________________
   <total_size>       <Instance_count>   <class_name>
   <total_size>       <Instance_count>   <class_name>
...

public class instance {
  public static void main(String args[]) {
    classA cls_a = new classA();
    try {
      Thread.sleep(20000);
    } catch (Exception e) {}
  }
}
class classA {
  classB a1;
  classC a2;
  classA() {
    a1 = new classB();
    a2 = new classC();
  }
}
class classB {
  classD b1;
  String b2;
  classB() {
    b1 = new classD();
    b2 = null;
  }
}
class classC {
  String c1, c2;
  classC() {
    c1 = null;
    c2 = null;
  }
}
class classD {
  String d1, d2;
  classD() {
    d1 = null;
    d2 = null;
  }
}