Which statement is true for the class java.util.HashSet？（）
- A、 The elements in the collection are ordered.
- B、 The collection is guaranteed to be immutable.
- C、 The elements in the collection are guaranteed to be unique.
- D、 The elements in the collection are accessed using a unique key.
- E、 The elements in the collections are guaranteed to be synchronized.
正确答案:C
答案解析:有
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