Remove all values from Java HashMap example

 This Java Example shows how to remove all values from HashMap object or empty HashMap or clear HashMap using clear method.

import java.util.HashMap;

public class EmptyHashMapExample {

 public static void main(String[] args) {

  // create HashMap object
  HashMap hMap = new HashMap();

  // add key value pairs to HashMap
  hMap.put("1", "One");
  hMap.put("2", "Two");
  hMap.put("3", "Three");

  /**
   * To remove all values or clear HashMap use void clear method() of
   * HashMap class. Clear method removes all key value pairs contained in
   * HashMap.
   **/

  hMap.clear();

  System.out.println("Total key value pairs in HashMap are : "
    + hMap.size());
 }
}

The output is:


Total key value pairs in HashMap are : 0