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Use of the Java collection HashMap

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The collection HashMap in Java is also a collection that can be used to store data in each.

The key value of elements in HashMap HashMap cannot be duplicated, that is, calling the Equals method to each other, and returning to false. The order of arrangement is not fixed.

Common methods of HashMap put<key,value>-> store object get (key); Get the data for the key.

KeySet () returns a set view of the keys contained in this map

Use of the Java collection HashMap

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