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Showing posts with label How to sort arraylist of strings alphabetically java. Show all posts
Showing posts with label How to sort arraylist of strings alphabetically java. Show all posts

Tuesday 20 December 2016

How to sort arraylist of strings alphabetically java

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. System.out.println(itr1.next());
  52.             
  53. }
  54.     
  55.   
  56. }
  57. }


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