Combining elements of two HashMap using in-built method putAll()

 

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

public class HashMapPutAll {

public static void main(String[] args) {

//Creating HashMap;

Map<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");

hm.putIfAbsent(7, "Badrabahu");

HashMap<Integer,String> hm1 = new HashMap<>();

//must value must not be same to use putAll() method

hm1.put(8,"language");

hm1.put(9,"java");

hm1.put(10,"bike");

hm.putAll(hm1);

System.out.println(hm);

}

}