Explain briefly the operation of each of the following methods of class HashMap:
a) put
b) get
c) isEmpty
d) containsKey
e) keySet
a) Adds a key/value pair into the HashMap.
b) Locates the value associated with the specified key.
c) Returns a boolean value indicating whether or not the HashMap is empty.
d) Determines whether specified key is in the HashMap.
e) Returns a Set of the keys in the HashMap.
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