How to sort arraylist of strings alphabetically java

ArrayList java Collections interview Questions

1.Basic Java example program to sort arraylist of strings

1. package com.javasortarraylistofobjects;
2.  
3. import java.util.ArrayList;
4. import java.util.Collections;
5. import java.util.Iterator;
6.  
7. public class SortArrayList{
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("C");
18. arrayList.add("D");
19. arrayList.add("Z");
20. arrayList.add("F");
21. arrayList.add("J");
22. arrayList.add("K");
23. arrayList.add("M");
24. arrayList.add("L");
25. arrayList.add("O");
26.        
27.         
28.  System.out.println("Before sorting ArrayList ...");
29.  Iterator itr=arrayList.iterator();
30.         
31. while (itr.hasNext()) {
32.  
33. System.out.println(itr.next());
34.      
35. }
36.  
37.        
38.  /*
39.  To sort an ArrayList object, use Collection.sort method. This is a
40.   static method. It sorts an ArrayList object's elements into ascending order.
41. */
42.   Collections.sort(arrayList);
43.      
44.   System.out.println("After sorting ArrayList ...");
45.        
46.     
47.         
48. Iterator itr1=arrayList.iterator();
49.         
50. while (itr1.hasNext()) {
51. 
    
52. System.out.println(itr1.next());
53.             
54. }
55.     
56.   
57. }
58. }
     

Output:

1. Before sorting ArrayList ...
2. A
3. C
4. D
5. Z
6. F
7. J
8. K
9. M
10. L
11. O
12. After sorting ArrayList ...
13. A
14. C
15. D
16. F
17. J
18. K
19. L
20. M
21. O
22. Z

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How to sort arraylist of strings alphabetically java

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