Print Elements of a HashMap in Java

A HashMap is a subclass of AbstractMap class and it is used to store key & value pairs. Each key is mapped to a single value in the map and the keys are unique.

It means we can insert a key only once in a map and duplicate keys are not allowed, but the value can be mapped to multiple keys. We can add the elements using the put() method of HashMap class and iterate the elements using the Iterator interface.

Syntax

public V put(K key, V value)

Example

import java.util.*;
import java.util.Map.*;
public class HashMapTest {
   public static void main(String[] args) {
      HashMap map = new HashMap();
      // adding the elements to hashmap using put() method
      map.put("1", "Adithya");
      map.put("2", "Jai");
      map.put("3", "Chaitanya");
      map.put("4", "Krishna");
      map.put("5", "Ramesh");
      if(!map.isEmpty()) {
         Iterator it = map.entrySet().iterator();
         while(it.hasNext()) {
            Map.Entry obj = (Entry)it.next();
            System.out.println(obj.getValue());
         }
      }
   }
}

Output

Adithya
Jai
Chaitanya
Krishna
Ramesh