Iterating over keys or values using keySet() and values() methods

 import java.util.HashMap;

import java.util.Map;

public class HashMapIteration2 {

public static void main(String[] args) {

//Creating HashMap;

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

//Putting element

hm.put(1, "Naidu");

hm.put(3, "Rohilla");

hm.put(5, "Vijay");

hm.put(2, "Rahul");

hm.put(4, "Ramakesh");

hm.put(6, "Sudeep");

//Storing null value

hm.put(null, null);

System.out.println("Iterating HashMap Using For each loop");

//Iterating over keys

for (Integer i : hm.keySet()) {

System.out.println("Key = " + i);

}

//Iterating over values

for(String str:hm.values()){

System.out.println("Value = "+str);

}

}

}