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Asked: 2026-05-25T03:25:58+00:00

I use legacy library and need use cast Object to Collection. For avoid exceptions

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I use legacy library and need use cast Object to Collection.
For avoid exceptions I think to use instanceof.
So questions two:
1. If I use instanceof – need use try.. catch cast exception to avoid exceptions?
2. Does it hits performance?
Thanks.

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1 Answer

  1. Editorial Team

    1. If you use instanceOf then you do not need try-catch(ClasscastException e). instanceOf is guaranteed to work, even with nulls.

    2. In today’s VMs, casting does not show any measurable performance hit. Rather if you find doing casting too often, then revisit your design.

    NOTE: instanceof does not work with Generics due to type erasure.

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