java - 在流中抛出自定义异常

Question

当找不到具有 firstName 和 lastName 的人时，我需要在我的代码中抛出 FriendNotFoundException。 是否可以在 Stream 中捕获异常？

现在我有这样的东西，但它失败了。

@Override
public Friend findFriend(String firstName, String lastName) throws FriendNotFoundException { 
    if (firstName == null || lastName ==null) {
        throw new IllegalArgumentException("There are no parameters");
    }
    if (friends.stream().filter(x -> !firstName.equals(x.getLastName()) && 
        (!lastName.equals(x.getLastName()))) != null);
    {
        throw new FriendNotFoundException(firstName, lastName);
    }

    return friends.stream().filter(
        x -> (firstName.equals(x.getFirstName())) && 
        (lastName.equals(x.getLastName()))).findAny().orElse(null);                     
}

Answer 1

答案是:

return friends.stream()
            .filter(x -> (firstName.equals(x.getFirstName())) && 
             (lastName.equals(x.getLastName())))
            .findAny()
            .orElseThrow(() -> new FriendNotFoundException(firstName, lastName))

顺便说一句，为了让代码更优雅，我的建议是做这样的事情:

Predicate<Person> firstNamePredicate = x -> firstName.equals(x.getFirstName())
Predicate<Person> lastNamePredicate = x -> firstName.equals(x.getLasttName())
 return friends.stream()
                .filter(firstNamePredicate.and(lastNamePredicate))
                .findAny()
                .orElseThrow(() -> new FriendNotFoundException(firstName, lastName))