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Question About TreeSet?

Afzal Rehman
Ranch Hand

Joined: Dec 16, 2009
Posts: 39


Why Output is 1? ,


SCJP 6.0
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 19004
    
  40


First, you example uses a HashSet -- not a TreeSet.... To answer your question, Sets don't allow duplicates.

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
Brij Garg
Ranch Hand

Joined: Apr 29, 2008
Posts: 234
Add method will return false if the object it is adding to the set is already there in the set.
bhanu chowdary
Ranch Hand

Joined: Mar 09, 2010
Posts: 256
HashSet won't allow duplicates.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Question About TreeSet?