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Remove all values from Java HashMap example

  1. /*
  2.   Remove all values from Java HashMap example
  3.   This Java Example shows how to remove all values from HashMap object or empty
  4.   HashMap or clear HashMap using clear method.
  5. */
  6.  
  7. import java.util.HashMap;
  8.  
  9. public class EmptyHashMapExample {
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create HashMap object
  14.     HashMap hMap = new HashMap();
  15.    
  16.     //add key value pairs to HashMap
  17.     hMap.put("1","One");
  18.     hMap.put("2","Two");
  19.     hMap.put("3","Three");
  20.  
  21.     /*
  22.       To remove all values or clear HashMap use
  23.       void clear method() of HashMap class. Clear method removes all
  24.       key value pairs contained in HashMap.
  25.     */
  26.    
  27.     hMap.clear();
  28.    
  29.     System.out.println("Total key value pairs in HashMap are : " + hMap.size());
  30.   }
  31. }
  32.  
  33. /*
  34. Output would be
  35. Total key value pairs in HashMap are : 0
  36. */