java - 防止使用无效参数构造实例

Question

我有一个接收 ArrayList 路由的构造函数:

public Voo(ArrayList<Routes> routes, LocalDateTime dateTime, Duration duration) {
    if (routes.isEmpty()) {

    }

    this.routes = routes;
    this.dateTime = dateTime;
    this.duration = duration;
    this.status = Status.CONFIRMED;
}

如果收到的 routes 为空，如何防止构造函数返回 Voo 实例？

Answer 1

通常会抛出IllegalArgumentException。例如

if (routes.isEmpty()) {
    throw new IllegalArgumentException("routes should be non-empty");
}