Computer scienceProgramming languagesJavaWorking with dataCollectionsCollection implementationsThe Map hierarchy implementations

HashMap

Advantages

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What are the advantages of HashMap ?

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Since Java 8 there сannot be collisions in HashMap

The order of the elements in HashMap is always the same

HashMap is mutable. You can change and delete elements from it

In most cases, HashMap provides O(1) complexity for get() and put() methods

HashMap is very effective for accessing the elements

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