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Check if a particular element exists in Java HashSet Example

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