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Swapping items of a list in Java : Collections.swap() with Example

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java.util.Collections.swap() method is a java.util.Collections class method. It swaps elements at the specified positions in given list.

// Swaps elements at positions "i" and "j" in myList.
public static void swap(List mylist, int i, int j)

It throws IndexOutOfBoundsException if either i
or j is out of range.

// Java program to demonstrate working of Collections.swap
import java.util.*;
public class GFG
    public static void main(String[] args)
        // Let us create a list with 4 items
        ArrayList<String>  mylist =
                        new ArrayList<String>();
        System.out.println("Original List : \n" + mylist);
        // Swap items at indexes 1 and 2
        Collections.swap(mylist, 1, 2);
        System.out.println("\nAfter swap(mylist, 1, 2) : \n"
                           + mylist);
        // Swap items at indexes 1 and 3
        Collections.swap(mylist, 3, 1);
        System.out.println("\nAfter swap(mylist, 3, 1) : \n"
                           + mylist);


Original List : Original List : 
[code, practice, quiz, geeksforgeeks]

After swap(mylist, 1, 2) : 
[code, quiz, practice, geeksforgeeks]

After swap(mylist, 3, 1) : 
[code, geeksforgeeks, practice, quiz]

This article is contributed by Mohit Gupta. If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

Last Updated : 11 Dec, 2018
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