List Operations Switch

package Week5Lists.Ex;

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

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

        List<Integer> listArray = Arrays.stream(scan.nextLine().split(" "))
                .map(Integer::parseInt).collect(Collectors.toList());

        String[] operator = scan.nextLine().split("\\s+");

        while (!"End".equals(operator[0])) {
            switch (operator[0]) {
                case "Add":
                    int number = Integer.parseInt(operator[1]);
                    listArray.add(number);
                    break;
                case "Insert":
                    number = Integer.parseInt(operator[1]);
                    int index = Integer.parseInt(operator[2]);

                    if (index < 0 || index > listArray.size()) {
                        System.out.println("Invalid index");
                    } else {
                        listArray.add(index, number);
                    }
                    break;
                case "Remove":
                    index = Integer.parseInt(operator[1]);

                    if (index < 0 || index >= listArray.size()) {
                        System.out.println("Invalid index");
                    } else {
                        listArray.remove(index);
                    }
                    break;
                case "Shift":
                    int count = Integer.parseInt(operator[2]);
                    switch (operator[1]) {
                        case "left":
                            for (int i = 0; i < count; i++) {
                                int tempNum = listArray.get(0);
                                listArray.remove(0);
                                listArray.add(tempNum);
                            }
                            break;
                        case "right":

                            for (int i = 0; i < count; i++) {
                                int tempNum = listArray.get(listArray.size() -1);
                                listArray.remove(listArray.get(listArray.size() -1));
                                listArray.add(0, tempNum);
                            }
                            break;
                    }
            }
            operator = scan.nextLine().split("\\s+");
        }

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