Classes that implement the interfaces use different storage mechanisms. the Hashing Supports insertion, deletion and growing the store. Indexed access is slower. But searching is faster. However, requires the use of unique keys for storing data elements. Quote from chairyuan's notes My question if two statement below Q1 The elements in the collection are guaranteed to be unique. Q2 The elements in the collection are accessed using a unique key. I think both are coorect .But the Q2 is seemt to incorrect. Pls tell me which is true? Thank u very much!
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