import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
// sort is a default method
// naturalOrder is a static method
public class Main {
public static void main(String... args) {
List<Integer> numbers = Arrays.asList(3, 5, 1, 2, 6);
numbers.sort(Comparator.naturalOrder());
System.out.println(numbers);
}
}