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); } } |
Set of Keys : [1, 2, 3, 4, 5] |