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Remove value from Java HashMap example

  1. /*
  2.   Remove value from Java HashMap example
  3.   This Java Example shows how to remove a key value pair from HashMap object using
  4.   remove method.
  5. */
  6.  
  7. import java.util.HashMap;
  8.  
  9. public class RemoveValueFromHashMapExample {
  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 a key value pair from HashMap use
  23.       Object remove(Object key) method of HashMap class.
  24.       It returns either the value mapped with the key or null if no value
  25.       was mapped.    
  26.     */
  27.    
  28.     Object obj = hMap.remove("2");
  29.     System.out.println(obj + " Removed from HashMap");
  30.    
  31.   }
  32. }
  33. /*
  34. Output would be
  35. Two Removed from HashMap
  36. */