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Joe, But the cost of a lookup is less than the cost of creating another object. Might be worth it for something like Integer(0) or Integer(1) (good chance to find that immutable) but maybe not for Integer(12345) (waste of time to look for). It's also a memory vs speed tradeoff. You save JVM memory if you can reuse immutables. Might be worth saving memory at the cost of slower object creation. Could benefit other things like garbage collection. Paul
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