Example of keySet method of HashMap.


 

Example of keySet method of HashMap.

Example of keySet method of HashMap.

Example of keySet method of HashMap.

Example of keySet method of HashMap.

In this example, we will introduce to you about the keySet method of HashMap. It returns a Set of keys of HashMap.

Code: 

HashMapKeySet.java

package net.roseindia.java;

import java.util.HashMap;

import java.util.Set;

public class HashMapKeySet {

public static void main(String[] arr) {

/* Create object of HashMap */

HashMap<Integer, String> obHashMap = new HashMap<Integer, String>();

/* Strore value in HashMap */

obHashMap.put(new Integer(1), "AAA");

obHashMap.put(new Integer(2), "BBB");

obHashMap.put(new Integer(3), "CCC");

obHashMap.put(new Integer(4), "DDD");

obHashMap.put(new Integer(5), "EEE");

/* Create a set of keys of hashmap */

Set obKeySet = obHashMap.keySet();

System.out.println("Set of Keys : " + obKeySet); } }

Output :
Set of Keys : [1, 2, 3, 4, 5]

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