FixedCode_Numbers

package PodgotovkaZaIzpit;

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

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


        List<Integer> numbers = new ArrayList<>();
        String[] initialSequence = scanner.nextLine().split(" ");
        for (String num : initialSequence) {
            numbers.add(Integer.parseInt(num));
        }

        String input = scanner.nextLine();
        while (!input.equals("Finish")) {
            String[] command = input.split(" ");
            String action = command[0];

            switch (action) {
                case "Add":
                    int numberToAdd = Integer.parseInt(command[1]);
                    numbers.add(numberToAdd);
                    break;
                case "Remove":
                    int numberToRemove = Integer.parseInt(command[1]);
                    numbers.remove(Integer.valueOf(numberToRemove));
                    break;
                case "Replace":
                    int value = Integer.parseInt(command[1]);
                    int replacement = Integer.parseInt(command[2]);
                    replaceFirstOccurrence(numbers, value, replacement);
                    break;
                case "Collapse":
                    int threshold = Integer.parseInt(command[1]);
                    collapseNumbers(numbers, threshold);
                    break;
            }
            input = scanner.nextLine();
        }

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

    private static void replaceFirstOccurrence(List<Integer> numbers, int value, int replacement) {
        for (int i = 0; i < numbers.size(); i++) {
            if (numbers.get(i) == value) {
                numbers.set(i, replacement);
                break;
            }
        }
    }

    private static void collapseNumbers(List<Integer> numbers, int threshold) {
        numbers.removeIf(number -> number < threshold);
    }
}