Array Modifier

import java.util.Arrays;
import java.util.Scanner;
import java.util.stream.Collectors;

public class ArrayModifier {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int[] numbers = Arrays
                .stream(scanner.nextLine().split("\\s+"))
                .mapToInt(Integer::parseInt)
                .toArray();

        String input = scanner.nextLine();
        while (!input.equals("end")) {
            String[] commands = input.split("\\s+");

            switch (commands[0]) {
                case "swap":
                    int firstElement = Integer.parseInt(commands[1]);
                    int secondElement = Integer.parseInt(commands[2]);

                    int tempNumber = numbers[firstElement];

                    numbers[firstElement] = numbers[secondElement];
                    numbers[secondElement] = tempNumber;
                    break;
                case "multiply":
                    int firstMultiplier = Integer.parseInt(commands[1]);
                    int secondMultiplier = Integer.parseInt(commands[2]);

                    int result = numbers[firstMultiplier] * numbers[secondMultiplier];

                    numbers[firstMultiplier] = result;
                    break;
                case "decrease":
                    for (int i = 0; i < numbers.length; i++) {
                        numbers[i] = numbers[i] - 1;
                    }
                    break;
            }
            input = scanner.nextLine();
        }
        String result = Arrays.stream(numbers)
                .mapToObj(String::valueOf)
                .collect(Collectors.joining(", "));

        System.out.println(result);
    }
}