Hash Map Implementation in Java

import java.util.HashMap;

public class TestHashMap {
 public static void main(String[] args) {
  // Declaring HashMap
  HashMap<String, String> hashMap = new HashMap<String, String>();
  // Inserting key value in hashmap
  hashMap.put("S1", "Mars");
  hashMap.put("S2", "Venus");
  hashMap.put("S3", "Earth");
  hashMap.put("S4", "Mercury");
  hashMap.put("S5", "Jupiter");
  hashMap.put("S6", "Saturn");

  System.out.println("Printing key value of hashmap");
  printHashMap(hashMap);

  // Remove element from hash map
  hashMap.remove("S1");
  hashMap.remove("S2");
  System.out.println("Printing key value of hashmap");
  printHashMap(hashMap);

 }

 private static void printHashMap(HashMap<String, String> hashMap) {
  for (Object key : hashMap.keySet()) {
  System.out.println("key : " + key + ", value : " + hashMap.get(key));

  }

 }

}

Output:
 Printing key value of hashmap
 key : S3, value : Earth
 key : S4, value : Mercury
 key : S5, value : Jupiter
 key : S6, value : Saturn
 key : S2, value : Venus
 key : S1, value : Mars
 Printing key value of hashmap
 key : S3, value : Earth
 key : S4, value : Mercury
 key : S5, value : Jupiter
 key : S6, value : Saturn

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