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Traverse through ArrayList in reverse direction using Java ListIterator Example

  1. /*
  2.   Traverse through ArrayList in reverse direction using Java ListIterator Example
  3.   This Java Example shows how to iterate through an ArrayList object in reverse
  4.   direction using Java ListIterator's previous and hasPrevious methods .
  5. */
  6.  
  7. import java.util.ListIterator;
  8. import java.util.ArrayList;
  9.  
  10. public class TraverseReverseUsingListIteratorExample {
  11.  
  12.   public static void main(String[] args) {
  13.     //create an object of ArrayList
  14.     ArrayList aList = new ArrayList();
  15.    
  16.     //Add elements to ArrayList object
  17.     aList.add("1");
  18.     aList.add("2");
  19.     aList.add("3");
  20.     aList.add("4");
  21.     aList.add("5");
  22.    
  23.     //Get an object of ListIterator using listIterator() method
  24.     ListIterator listIterator = aList.listIterator();
  25.  
  26.     //Traverse in forward direction  
  27.     System.out.println("Traversing ArrayList in forward direction
  28.                                             using ListIterator");
  29.     while(listIterator.hasNext())
  30.       System.out.println(listIterator.next());
  31.      
  32.     /*
  33.       Traverse the ArrayList in reverse direction using hasPrevious and previous
  34.       methods of ListIterator. hasPrevious method returns true if
  35.       ListIterator has more elements to traverse in reverse direction.
  36.       Previous method returns previous element in the list.
  37.     */
  38.     System.out.println("Traversing ArrayList in reverse direction
  39.                                                         using ListIterator");
  40.     while(listIterator.hasPrevious())
  41.       System.out.println(listIterator.previous());
  42.      
  43.   }
  44. }
  45.  
  46. /*
  47. Traversing ArrayList in forward direction using ListIterator
  48. 1
  49. 2
  50. 3
  51. 4
  52. 5
  53. Traversing ArrayList in reverse direction using ListIterator
  54. 5
  55. 4
  56. 3
  57. 2
  58. 1
  59. */