Java program to insert an element to ArrayList using ListIterator Example

ArrayList java Collections interview Questions ListIterator

1.Basic Java example program to insert element using list iterator to arraylist

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. System.out.println("Before inserting element");
33.  
34. for(int intIndex = 0; intIndex < arrayList.size(); intIndex++)
35.               System.out.println(arrayList.get(intIndex)); 
36. ListIterator itr = arrayList.listIterator();
37.        
38. /*
39.       Use void add(Object o) method of ListIterator to add or insert an element
40.       to List. It adds an element just before the element that would have
41.       been returned by next method call and after the element that would have
42.       returned by previous call.
43.     */
44.    
45.     itr .next();
46.        
47.     //Add an element
48.     itr .add("Added Element");
49.     /*
50.  
51. System.out.println("After inserting element .");
52.  
53. for(int intIndex = 0; intIndex < arrayList.size(); intIndex++)
54.               System.out.println(arrayList.get(intIndex));   
55.  
56. }
57. }
     

Output:

1. Before inserting element
2. A
3. B
4. C
5. D
6. F
7. F
8. G
9. H
10. I
11. After inserting element .
12. A
13. Added Element
14. B
15. C
16. D
17. F
18. F
19. G
20. H
21. I

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Java program to insert an element to ArrayList using ListIterator Example

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