Number Array

package TechFundamentals;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class midExams_Fund_One {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] input = scanner.nextLine().split("\\s+");
        List<Integer> numbers = new ArrayList<>();
        for (int i = 0; i < input.length; i++) {
            numbers.add(Integer.parseInt(input[i]));
        }

        String command = scanner.next();

        while (!command.equals("End")) {


            switch (command) {
                case "Switch":
                    int indexSwitch = scanner.nextInt();
                    if (0 <= indexSwitch && indexSwitch < numbers.size()) {
                        int tempSwitch = numbers.get(indexSwitch) * -1;


                        numbers.set(indexSwitch, Integer.valueOf(tempSwitch));
                    }

                    break;
                case "Change":
                    int indexChange = scanner.nextInt();
                    int indexValue = scanner.nextInt();
                    if (0 <= indexChange && indexChange < numbers.size()) {
                        numbers.set(indexChange, indexValue);
                    }

                    break;
                case "Sum":
                    String commandOne = scanner.next();
                    switch (commandOne) {
                        case "Negative":
                            int negative = 0;
                            for (int i = 0; i < numbers.size(); i++) {
                                if (numbers.get(i) < 0) {
                                    negative += numbers.get(i);
                                }
                            }
                            System.out.println(negative);

                            break;
                        case "Positive":
                            int positive = 0;
                            for (int i = 0; i < numbers.size(); i++) {
                                if (numbers.get(i) >= 0) {
                                    positive += numbers.get(i);
                                }
                            }
                            System.out.println(positive);
                            break;
                        case "All":
                            int all = 0;
                            for (int i = 0; i < numbers.size(); i++) {
                                all += numbers.get(i);
                                ;
                            }
                            System.out.println(all);
                            break;
                    }

                    break;


            }


            command = scanner.next();
        }
        for (int i = 0; i < numbers.size(); i++) {
            if (numbers.get(i) < 0) {
                numbers.remove(i);
                i--;
            }
        }

        System.out.println(numbers.toString().replaceAll("[\\[\\],]", ""));
    }
}