Collection HashMap

Collection HashMap

Please give me an example in which hash map having key value pair and key should be map again means map within map example. thanks in advance.

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Collection HashMap
Collection HashMap  Please give me an example in which hash map having key value pair and key should be map again means map within map example. thanks in advance
Collection HashMap
Collection HashMap  Please give me an example in which hash map having key value pair and key should be map again means map within map example. thanks in advance
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