Moving Target

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

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

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

        String input = scanner.nextLine();
        while (!input.equals("End")) {
            String[] element = input.split("\\s+");
            String command = element[0];
            switch (command) {
                case "Shoot":
                    int indexShoot = Integer.parseInt(element[1]);
                    int power = Integer.parseInt(element[2]);
                    if (indexShoot >= 0 && indexShoot < sequenceOfTargets.size()) {
                        sequenceOfTargets.set(indexShoot, sequenceOfTargets.get(indexShoot) - power);
                        if (sequenceOfTargets.get(indexShoot) <= 0) {
                            sequenceOfTargets.remove(indexShoot);
                        }
                    }
                    break;
                case "Add":
                    int indexToAdd = Integer.parseInt(element[1]);
                    int value = Integer.parseInt(element[2]);
                    if (indexToAdd >= 0 && indexToAdd < sequenceOfTargets.size()) {
                        sequenceOfTargets.add(indexToAdd, value);
                    } else {
                        System.out.println("Invalid placement!");
                    }
                    break;
                case "Strike":
                    int strikeIndex = Integer.parseInt(element[1]);
                    int radius = Integer.parseInt(element[2]);
                    int start = strikeIndex - radius;
                    int end = strikeIndex + radius;
                    if (start >= 0 && end < sequenceOfTargets.size()) {
                        sequenceOfTargets.subList(start, end + 1).clear();
                    } else {
                        System.out.println("Strike missed!");
                    }
                    break;
            }
            input = scanner.nextLine();
        }
        System.out.print(Arrays.toString(new List[]{sequenceOfTargets})
                .replaceAll("[\\[\\]]", "")
                .replaceAll(", ", "|"));
    }
}