Java 在流中抛出自定义异常

Java 在流中抛出自定义异常,java,exception,java-stream,Java,Exception,Java Stream,我需要在代码中抛出FriendNotFoundException,如果找不到名为firstName和lastName的人是否可以捕获流中的异常? 现在我有了这样的东西,但它失败了 @Override public Friend findFriend(String firstName, String lastName) throws FriendNotFoundException { if (firstName == null || lastName ==null) {

我需要在代码中抛出
FriendNotFoundException
,如果找不到名为
firstName
lastName
的人是否可以捕获流中的异常?

现在我有了这样的东西,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);                     
}
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))
Predicate firstName Predicate=x->firstName.equals(x.getFirstName())
谓词lastname Predicate=x->firstName.equals(x.getLasttName())
return friends.stream()
.filter(firstNamePredicate.and(lastNamePredicate))
.findAny()
.OrelsThrow(()->new FriendNotFoundException(firstName,lastName))

,不要认为定义两个谓词会使代码更具可读性。但是删除多余的括号可以…