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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