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One thing to watch out for: Make sure the class you're using as a key is immutable -- otherwise, a key will hash to one thing when you put it in, but something different when you take it out.

Edit: It doesn't have to be immutable, but it has to be true that it can only be changed in a way that doesn't change the hashcode. Making the entire object immutable is the simplest way to do that, but it's not the only way.

asked Aug 22 in Java Interview Questions by rajesh | 10 views



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