在流中抛出自定义异常

Question

FriendNotFoundException当没有人找到firstName并且lastName找不到时,我需要输入我的代码.是否有可能在Stream中捕获异常？

现在我有类似的东西,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,让代码更优雅,我的主张就是这样做:

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))