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Reverse order of all elements of Java ArrayList Example

  1. /*
  2.   Reverse order of all elements of Java ArrayList Example
  3.   This java example shows how to reverse the order of all elements of Java ArrayList
  4.   using reverse method of Collections class.
  5. */
  6.  
  7. import java.util.ArrayList;
  8. import java.util.Collections;
  9.  
  10. public class ReverseOrderArrayListExample {
  11.  
  12.   public static void main(String[] args) {
  13.  
  14.     //create an ArrayList object
  15.     ArrayList arrayList = new ArrayList();
  16.    
  17.     //Add elements to Arraylist
  18.     arrayList.add("A");
  19.     arrayList.add("B");
  20.     arrayList.add("C");
  21.     arrayList.add("D");
  22.     arrayList.add("E");
  23.    
  24.     System.out.println("Before Reverse Order, ArrayList Contains : " + arrayList);
  25.    
  26.     /*
  27.       To reverse the order of all elements of Java ArrayList use,
  28.       static void reverse(List list) method of Collections class.
  29.      
  30.       This method reverse the order of elements of specified list.
  31.     */
  32.    
  33.     Collections.reverse(arrayList);
  34.    
  35.     System.out.println("After Reverse Order, ArrayList Contains : " + arrayList);
  36.    
  37.   }
  38. }
  39.  
  40. /*
  41. Output would be
  42. Before Reverse Order, ArrayList Contains : [A, B, C, D, E]
  43. After Reverse Order, ArrayList Contains : [E, D, C, B, A]
  44. */