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Check if a particular value exists in Java HashMap example

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  1. /*
  2.   Check if a particular value exists in Java HashMap example
  3.   This Java Example shows how to check if HashMap object contains a particular
  4.   value using containsValue method of HashMap class.
  5. */
  6.  
  7. import java.util.HashMap;
  8.  
  9. public class CheckValueOfHashMapExample {
  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 check whether a particular value exists in HashMap use
  23.       boolean containsValue(Object key) method of HashMap class.
  24.       It returns true if the value is mapped to one or more keys in the
  25.       HashMap otherwise false.
  26.     */
  27.    
  28.     boolean blnExists = hMap.containsValue("Two");
  29.     System.out.println("Two exists in HashMap ? : " + blnExists);
  30.   }
  31. }
  32.  
  33. /*
  34. Output would be
  35. Two exists in HashMap ? : true
  36. */