The entrySet() method in Java’s HashMap returns a set view of the mappings (key-value pairs) contained in the map. Each element in the returned set is a Map.Entry object, which provides methods to access both the key and value of each mapping.
This method is commonly used when you want to iterate through all the key-value pairs in a HashMap or perform operations on them. The returned set is backed by the original HashMap, meaning changes to the set will directly affect the map.