How to Iterate ArrayList using Java ListIterator Example

ArrayList Concept and Interview Questions

How to Iterate ArrayList using Java ListIterator Example

Kris Kimcil 23.21 Komentar

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

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