HashMap keySet() in Java

keySet(): This method is available in java.util.HashMap class of Java.

Syntax:

Set<K> java.util.HashMap.keySet()

This method returns a Set view of the keys contained in this map.

Parameters: NA

Returns: a set view of the keys contained in this map.

Exceptions: NA

Approach

Java

import java.util.HashMap;

public class HashMapkeySet {
    public static void main(String[] args) {
        HashMap<String, Integer> hashMap = 
                       new HashMap<String, Integer>();

        hashMap.put("Hello", 1);
        hashMap.put("World", 2);

        System.out.println(hashMap.keySet());

    }
}

Output:

[Hello, World]