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.swapimport 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>();        mylist.add("code");        mylist.add("practice");        mylist.add("quiz");        mylist.add("neveropen");          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);    }} |
Output:
Original List : Original List : [code, practice, quiz, neveropen] After swap(mylist, 1, 2) : [code, quiz, practice, neveropen] After swap(mylist, 3, 1) : [code, neveropen, practice, quiz]
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