1. Манипулации на лист

package Lists;

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

public class ListManipulations_01 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        //прочитам списък от цели числа от конзолата
        List<Integer> numbers = Arrays.stream(scanner.nextLine().split(" "))
                .map(Integer::parseInt).collect(Collectors.toList());

        //повтарям: въвеждам команди
        //спирам: команда == "end"
        //продължавам: команда != "end"
        String command = scanner.nextLine();

        while (!command.equals("end")) {
             //"Add 1" -> split(" ") ->      ["Add", "1"]
            //"Remove 8" -> split(" ") ->    ["Remove", "8"]
            //"RemoveAt 0" -> split (" ") -> ["RemoveAt", "0"]
            //"Insert 2 4" -> split (" ") -> ["Insert", "2", "4"]
            String [] commandParts = command.split(" ");
            String commandName = commandParts[0]; // "Add", "Remove", "RemoveAt", "Insert"

            switch (commandName) {
                case "Add":
                    int number = Integer.parseInt(commandParts[1]);
                    numbers.add(number);
                    break;
                case "Remove":
                    int numberForRemove = Integer.parseInt(commandParts[1]);
                    numbers.remove(Integer.valueOf(numberForRemove));
                    break;
                case "RemoveAt":
                    int index = Integer.parseInt(commandParts[1]);
                    numbers.remove(numbers.get(index));
                    break;
                case "Insert":
                    int numberToInsert = Integer.parseInt(commandParts[1]);
                    int indexToInsert = Integer.parseInt(commandParts[2]);
                    numbers.add(indexToInsert, numberToInsert);
                    break;
            }
            command = scanner.nextLine();
        }

        for (int number : numbers) {
            System.out.print(number + " ");
        }
    }
}