java - Simple Set with only "contains" method -


I am looking for a simple set in Java that only provides the following functionality. 

 set  add (string); Set contains (string s);   
 There is no need to retrieve any elements of the set. I want to see what I have to do, to see whether the string is contained or not. Is there any such data structure in Java?  
 Edit: I know that I can use a set implementation like Hussett, etc. ... but I want a minimum data structure with only two methods listed above. / P> 
 EDIT2: Im has a memory constraint system.   
 
 
 Use, both of which have functionality, but this will not allow duplicates

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