import java.util.Collections;

import java.util.ArrayList;

class Main {

public static void main(String[] args) {

ArrayList<Integer> numbers = new ArrayList<>();

numbers.add(1);

numbers.add(2);

System.out.println("ArrayList1: " + numbers);

Collections.reverse(numbers);

System.out.println("Reversed ArrayList1: " + numbers);

Collections.swap(numbers, 0, 1);

System.out.println("ArrayList1 using swap(): " + numbers);

ArrayList<Integer> newNumbers = new ArrayList<>();

newNumbers.addAll(numbers);

System.out.println("ArrayList2 using addAll(): " + newNumbers);

Collections.fill(numbers, 0);

System.out.println("ArrayList1 using fill(): " + numbers);

Collections.copy(newNumbers, numbers);

System.out.println("ArrayList2 using copy(): " + newNumbers);

}

}