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Reverse order of all elements of ArrayList with Java Collections
In order to reverse order of all elements of ArrayList with Java Collections, we use the Collections.reverse() method.
Declaration −The java.util.Collections.reverse method is declared as follows −
public static void reverse(List<?> list)
Let us see a program to reverse order of all elements of ArrayList with Java Collections −
Example
import java.util.*;
public class Example {
public static void main (String[] args) {
ArrayList<Integer> list = new ArrayList<Integer>();
list.add(1);
list.add(2);
list.add(7);
list.add(8);
list.add(3);
list.add(9);
System.out.println("Original list : " + list);
Collections.reverse(list); // reversing the list
System.out.println("Reversed list : " + list);
}
}Output
Original list : [1, 2, 7, 8, 3, 9] Reversed list : [9, 3, 8, 7, 2, 1]
Updated on: 25-Jun-2020
2K+ Views
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