O2. Array Modifier / O2. Mid Exam Retake

package MidExam.O2;

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

public class O2ArrayModifier {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        List<Integer> test = Arrays.stream(scanner.nextLine().split("\\s+")).
                map(Integer::parseInt).collect(Collectors.toList());
        String input = scanner.nextLine();
        while (!input.equals("end")) {
            String command = input.split(" ")[0];
            switch (command) {
                case "swap":
                case "multiply":
                    int index = Integer.parseInt(input.split(" ")[1]);
                    int index2 = Integer.parseInt(input.split(" ")[2]);
                    int a = test.get(index);
                    int b = test.get(index2);
                    if (command.equals("swap")){
                        test.set(index, b);
                        test.set(index2, a);
                    }else{
                        int sum = a * b;
                        test.set(index, sum);
                    }
                    break;
                case "decrease":
                    for (int i = 0; i < test.size(); i++) {
                        test.set(i, test.get(i) - 1);
                    }
                    break;
            }
            input = scanner.nextLine();
        }
        for (int i = 0; i < test.size() - 1; i++) {
            System.out.print(test.get(i) + ", ");
        }
        System.out.print(test.get(test.size() - 1));
    }
}