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Why String is popular HashMap key in Java?

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Why String is popular HashMap key in Java?
posted Jan 18, 2018 by Frank Lee

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String is immutable, its hashcode is cached at the time of creation and it doesn’t need to be calculated again. This makes it a great candidate for key in a Map and it’s processing is fast than other HashMap key objects. This is why String is mostly used Object as HashMap keys.

answer Jan 19, 2018 by Jon Deck
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