if hashmap contains only one key then how to get that key

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Sara
17 Nov 2020
1HashMap<Node, Integer> x = qu.remove();	
2// This "qu" is a queue which is returning a Hashmap
3// of type HashMap<Node, Integer> this hashmap contains
4// only one key,value pair
5Node node = x.keySet().iterator().next();
6// here we are extracting that "KEY" of hashMap into variable of Node type
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