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Check if a particular value exists in Java Hashtable example

  1. /*
  2.   Check if a particular value exists in Java Hashtable example
  3.   This Java Example shows how to check if Hashtable object contains a particular
  4.   value using contains method of Hashtable class.
  5. */
  6.  
  7. import java.util.Hashtable;
  8.  
  9. public class CheckValueOfHashtableExample {
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create Hashtable object
  14.     Hashtable ht = new Hashtable();
  15.    
  16.     //add key value pairs to Hashtable
  17.     ht.put("1","One");
  18.     ht.put("2","Two");
  19.     ht.put("3","Three");
  20.    
  21.     /*
  22.       To check whether a particular value exists in Hashtable use
  23.       boolean contains(Object key) method of Hashtable class.
  24.       It returns true if the value is mapped to one or more keys in the
  25.       Hashtable otherwise false.
  26.     */
  27.    
  28.     boolean blnExists = ht.contains("Two");
  29.     System.out.println("Two exists in Hashtable ? : " + blnExists);
  30.   }
  31. }
  32.  
  33. /*
  34. Output would be
  35. Two exists in Hashtable ? : true
  36. */