What is the requirement for an object to be used as key or value in HashMap?
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The put() method of HashMap works in the principle of hashing. It is responsible for storing an object into backend array. The hashcode() method is used in conjunction with a hash function to find the correct location for the object into the bucket. If a collision occurs then the entry object which contains both key and value is added to a linked list and that linked list is stored into the bucket location
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