Player.java

package baseball.domain;

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

public class Player {
    private final List<Integer> numbers;

    public Player(String input) {
        validate(input);
        this.numbers = parse(input);
    }

    private void validate(String input) {
        if (!input.matches("^[1-9]{3}$")) {
            throw new IllegalArgumentException("[ERROR] 1-9 사이의 숫자 3개를 입력해야 합니다.");
        }
        if (hasDuplicate(input)) {
            throw new IllegalArgumentException("[ERROR] 중복된 숫자가 있습니다.");
        }
    }

    private boolean hasDuplicate(String input) {
        return input.chars().distinct().count() != input.length();
    }

    private List<Integer> parse(String input) {
        List<Integer> list = new ArrayList<>();
        for (char c : input.toCharArray()) {
            list.add(Character.getNumericValue(c));
        }
        return list;
    }

    public List<Integer> getNumbers() {
        return numbers;
    }
}