How to Iterate ArrayList using Java ListIterator Example

1.Basic Java example program to iterate arraylist elements using list iterator

1. package com.javaIteratearraylistiterator;
2.  
3. import java.util.ArrayList;
4. import java.util.Collections;
5. import java.util.Iterator;
6.  
7. public class IterateListIteratorArrayList{
8.  
9. public static void main(String[] args) {
10.   
11. //create an ArrayList object
12. ArrayList<String> arrayList = new ArrayList();
13.        
14. //Add elements to Arraylist
15.  
16. arrayList.add("A");
17. arrayList.add("B");
18. arrayList.add("C");
19. arrayList.add("D");
20. arrayList.add("F");
21. arrayList.add("F");
22. arrayList.add("G");
23. arrayList.add("H");
24. arrayList.add("I");
25.     
26.         
27.  /*
28. Get a ListIterator object for ArrayList using
29. istIterator() method.
30. */
31.  
32. ListIterator itr = arrayList.listIterator();
33.        
34. /*
35. Use hasNext() and next() methods of ListIterator to iterate through
36. the elements in forward direction.
37. */
38.  
39. System.out.println("Iterating through ArrayList elements in forward  direction...");
40.  
41. while(itr.hasNext())
42. System.out.println(itr.next());
43.      
44. /*Use hasPrevious() and previous() methods of ListIterator to iterate through
45. the elements in backward direction.*/
46.  
47. System.out.println("Iterating through ArrayList elements in backward   direction...");
48.         
49.  
50. while(itr.hasPrevious())
51. System.out.println(itr.previous()); 
52.   
53. }
54.  
55. }
     

Output:

1. Iterating through ArrayList elements in forward  direction...
2. A
3. B
4. C
5. D
6. F
7. F
8. G
9. H
10. I
11. Iterating through ArrayList elements in backward   direction...
12. I
13. H
14. G
15. F
16. F
17. D
18. C
19. B
20. A