public static void swap(List<Object> list, int i, int j);

package in.bench.resources.java.collection;

import java.util.ArrayList;
import java.util.Collections;

public class Swap2ElementsOfJavaArrayList {

	public static void main(String[] args) {

		// creating ArrayList object of type String
		ArrayList<String> al = new ArrayList<String>();

		// adding elements to ArrayList object
		al.add("Narayan Murthy");
		al.add("Dinesh");
		al.add("Nandan Nilekeni");
		al.add("Ashok Arora");
		al.add("Shibulal");
		al.add("Kris Gopalakrishnan");
		al.add("Raghavan");

		System.out.println("Before Swap: Iterating"
				+ " ArrayList values as per Insertion Order\n");

		// Iterating using enhanced for-loop
		for(String str : al){
			System.out.println(str);
		}

		// swapping elements of ArrayList using Collections.sort(al);
		// element-3 (index-2) with element-7 (index-6)
		Collections.swap(al, 2, 6);

		System.out.println("\n\nAfter Swap: "
				+ "index position 2nd with 6th\n");

		// Iterating using enhanced for-loop
		for(String str : al){
			System.out.println(str);
		}
	}
}

Before Swap: Iterating ArrayList values as per Insertion Order

Narayan Murthy
Dinesh
Nandan Nilekeni
Ashok Arora
Shibulal
Kris Gopalakrishnan
Raghavan

After Swap index position 2nd with 6th

Narayan Murthy
Dinesh
Raghavan
Ashok Arora
Shibulal
Kris Gopalakrishnan
Nandan Nilekeni