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This article mainly introduces Java how to judge whether the array has repeated elements of the relevant knowledge, the content is detailed and easy to understand, the operation is simple and fast, has a certain reference value, I believe that after reading this Java how to determine whether the array has repeated elements of the article will have a harvest, let's take a look.

Because arrays allow repeating elements, while HashSet does not allow repeating elements

So by using an iterator on the array elements, put the array elements into the HashSet one by one, (add ())

Then judge the length of the array and HashSet (Hashset.size () and array .length).

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