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Get Enumeration over Java HashSet Example

  1. /*
  2.   Get Enumeration over Java HashSet Example
  3.   This java example shows how to get Enumeration over Java HashSet using enumeration
  4.   method of Collections class. This example also shows how to enumerate through
  5.   elements of Java HashSet.
  6. */
  7.  
  8. import java.util.Enumeration;
  9. import java.util.HashSet;
  10. import java.util.Collections;
  11.  
  12. public class GetEnumerationOverHashSetExample {
  13.  
  14.   public static void main(String[] args) {
  15.     //create a HashSet object
  16.     HashSet hashSet = new HashSet();
  17.    
  18.     //Add elements to HashSet
  19.     hashSet.add("A");
  20.     hashSet.add("B");
  21.     hashSet.add("D");
  22.     hashSet.add("E");
  23.     hashSet.add("F");
  24.  
  25.     /*
  26.        Get Enumeration over Java HashSet object using,
  27.        static Enumeration enumeration(Collection c) method of Collections class.
  28.      
  29.        This method returns the enumeration object over the specified Collection.
  30.      
  31.     */
  32.    
  33.     //get the Enumeration object
  34.     Enumeration e = Collections.enumeration(hashSet);
  35.    
  36.     //enumerate through the HashSet elements
  37.     System.out.println("Enumerating through Java HashSet");
  38.     while(e.hasMoreElements())
  39.       System.out.println(e.nextElement());
  40.   }
  41. }
  42.  
  43. /*
  44. Output would be
  45. Enumerating through Java HashSet
  46. A
  47. B
  48. D
  49. E
  50. F
  51. */