Java: Check whether a map contains key-value mappings (empty) or not

Last update on May 22 2025 13:15:29 (UTC/GMT +8 hours)

5. Check If Map is Empty

Write a Java program to check whether a map contains key-value mappings (empty) or not.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example5 {  
   public static void main(String args[]) {
  HashMap <Integer,String> hash_map = new HashMap <Integer,String> ();
  hash_map.put(1, "Red");
  hash_map.put(2, "Green");
  hash_map.put(3, "Black");
  hash_map.put(4, "White");
  hash_map.put(5, "Blue");
  // check if map is empty
  boolean result = hash_map.isEmpty();
  // check the result
  System.out.println("Is hash map empty: " + result);
  // Removing all the elements from the linked map
  hash_map.clear();
  // check if map is empty
  result = hash_map.isEmpty();
  // check the result
  System.out.println("Is hash map empty: " + result);
 }
}

Sample Output:

Is hash map empty: false                                               
Is hash map empty: true

For more Practice: Solve these Related Problems:

Write a Java program to check if a HashMap is empty using the isEmpty() method and output an appropriate message.
Write a Java program to use a conditional operator to print "Empty" or "Not Empty" based on the map’s size.
Write a Java program to clear a map and then verify emptiness by comparing its size to zero.
Write a Java program to check if a newly created map is empty and then add an element to confirm the change.

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Java Code Editor:

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