a48arrayList1.java

import java.util.ArrayList;
import java.util.Collections;
public class a48arrayList1 {
    //swapping in Al
    static void swapAl(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(1);
        list.add(2);
        list.add(3);
        list.add(4);
        list.add(5);
        int idx1 = 1 , idx2 = 3;
        System.out.println(list);
        swapAl(list, idx1, idx2);
        System.out.println(list);

        // sorting using Al
        Collections.sort(list);
        System.out.println(list);
        Collections.sort(list, Collections.reverseOrder());
        System.out.println(list);
        
    }
}