Method swap

11_ArrayLists/Swap.java:3–7

(ArrayList<Integer> list, int idx1, int idx2)

import java.util.ArrayList;
public class Swap {
    public static void swap(ArrayList<Integer> list, int idx1, int idx2) {
        int temp = list.get(idx1);
        list.set(idx1, list.get(idx2));
        list.set(idx2, temp);
    }
    public static void main(String args[]) {
        ArrayList<Integer> list = new ArrayList<>();
        list.add(2);