How do you swap two elements in a list using Collections class API?

Using Collections.swap.

It swaps the elements at the specified positions in a specified list.

  swap(List listElement, int i, int k)

This static method of Collections class swap the element between the position i and k at the listElement.

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class CollectionsSwap {

	public static void main(String[] args) {

		List<String> fruitList = Arrays.asList("Apple", "Orange", "Strawberry");

		System.out
				.println("The fruits available in the shopping List based on priority:");
		for (String fruit : fruitList) {
			System.out.println("* " + fruit);
		}

		// Swapping the priority between Orange and apple
		Collections.swap(fruitList, 0, 1);

		System.out
				.println("The fruits available in the shopping List (priority changed):");
		for (String fruit : fruitList) {
			System.out.println("* " + fruit);
		}

	}

}

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