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what does entrySet return??
it returns a set.

so does it contain both the 'key' and 'value' in case of hashmap??
If you take a look at the API documentation for the Map.entrySet() method it should be pretty obvious what exactly is returned.
Yes. The JavaDoc for Java 5+ shows this a bit more clearly. It says the return type is:

This is a Set of Entry objects. The Entry class is defined within Map and has the key/value pairs.
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