w3resource
Java Exercises

Java Collection, HashMap Exercises: Remove all the mappings from a map

Java Collection, HashMap Exercises: Exercise-4 with Solution

Write a Java program to remove all the mappings from a map.

Sample Solution:-

Java Code:

import java.util.*;  
public class Example4 {  
   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");
  // print the map
  System.out.println("The Original linked map: " + hash_map);
  // Removing all the elements from the linked map
  hash_map.clear();
  System.out.println("The New map: " + hash_map);
 }
}

Sample Output:

The Original linked map: {1=Red, 2=Green, 3=Black, 4=White, 5=Blue}    
The New map: {}

Java Code Editor:

Contribute your code and comments through Disqus.

What is the difficulty level of this exercise?



New Content: Composer: Dependency manager for PHP, R Programming