P4_ListOperations_Lists_Ex

package feb20_Lists_Exercises;

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

public class P4_ListOperations {
    public static void main(String[] args) {
        @SuppressWarnings("resource")

        Scanner sc = new Scanner(System.in);

        List<Integer> numbers = Arrays.stream(sc.nextLine().split("\\s+")).map(Integer::parseInt)
                .collect(Collectors.toList());

        String input = "";

        while (!"End".equals(input = sc.nextLine())) {
            String[] data = input.split("\\s+");

            String command = data[0];

            switch (command) {
            case "Add":
                numbers.add(Integer.parseInt(data[1]));
                break;
            case "Insert":
                int element = Integer.parseInt(data[1]);
                int index = Integer.parseInt(data[2]);

                if (index >= 0 && index <= numbers.size()) {
                    numbers.add(index, element);
                } else {
                    System.out.println("Invalid index");
                }

                break;
            case "Remove":
                int indexToRemove = Integer.parseInt(data[1]);

                if (indexToRemove >= 0 && indexToRemove <= numbers.size()) {
                    numbers.remove(indexToRemove);
                } else {
                    System.out.println("Invalid index");
                }

                break;
            case "Shift":
                if (numbers.size() > 0) {
                    int count = Integer.parseInt(data[2]) % numbers.size();
                    count = count % numbers.size();

                    if (data[1].equals("left")) {
                        for (int i = 0; i < count; i++) {
                            numbers.add(numbers.get(0));
                            numbers.remove(0);
                        }

                    } else {
                        for (int i = 0; i < count; i++) {
                            numbers.add(0, numbers.get(numbers.size() - 1));
                            numbers.remove(numbers.size() - 1);
                        }
                    }
                }
                break;
            }
        }

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