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Enums in Treeset

 
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here how is the sorting done?
 
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TreeSet will use the natural ordering of the elements in this case (since you are not passing a Comparator to the TreeSet constructor.) And I think the natural ordering of enums is the order in which the enum constants are declared in the body of the enum. You could try and change the order of declaration in the enum and run it again to confirm.
 
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Yes I tried this. it is getting the order in which enums are declared in the enum body.
 
Abhi vijay
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Yes. same here. We shall wait for Punit or Ankit to confirm.
 
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Abhi vijay wrote: We shall wait for Punit or Ankit to confirm.


why?
 
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compareTo

public final int compareTo(E o)

Compares this enum with the specified object for order. Returns a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object. Enum constants are only comparable to other enum constants of the same enum type. The natural order implemented by this method is the order in which the constants are declared.

Specified by:
compareTo in interface Comparable<E extends Enum<E>>

Parameters:
o - the object to be compared.
Returns:
a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.



From: http://java.sun.com/javase/6/docs/api/java/lang/Enum.html
 
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