Question

Which of these methods can be used to obtain set of all keys in a map?

(a) getAll()

(b) getKeys()

(c) keyall()

(d) keySet()

The question was posed to me in my homework.

This intriguing question originated from Java.util in portion java.util – The Collections Framework of Java

Answer 1

The correct option is (d) keySet()

To explain I would say: keySet() methods is used to get a set containing all the keys used in a map. This method provides set view of the keys in the invoking map.