[PATCH] java.util.Collections enhancement

[Сергей Цыпанов]

Hi,

looking into the code of java.util.Collections I've found out that EmptyList#toArray() and EmptySet#toArray() both instantiate new instance of Object[] at each call. As far as Java array is immutable it's possible to cache empty Object array and return this cached instance.

Patch.txt is attached to the body of this mail.

Thanks,
- Sergei Tsypanov
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