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#462

From: Petar Popara
Date: Fri, 15 Apr 2005 12:29

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    I need a class (something like ArrayList), where I would add objects and 
it would not accept same object twice (it would only keep one reference of 
each object). Does something like this exists?

Example:

ArrayList a = new ArrayList();
Integer i = new Integer(777);
a.add(i);
a.add(i); //ignore it
a.add(i); //ignore it
...

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