Java 可选，删除值并返回，有没有更好的方法？

Question

public Optional<ReligiousOrderEntity> deleteReligiousOrderEntity( Long id){
    religiousOrderRepository.findById(id)
        .ifPresent( religiousOrderRepository::delete );
    
    return religiousOrderRepository.findById(id);
}

That is my code but I don't feel good about it. Looks to me that there should be a better way using Optionals.

The religiousOrderRepository.findById(id) returns an Optional with a ReligiousOrderEntity on it, but before returning, we need to delete it.

(don't worry about the delete function, you can assume it works)

Answer 1

If you find an entry, you delete it, then you try to find something again for the return value. That will always be an empty Optional because of the deletion.

You need to remember the value returned by the first findById :

public Optional<ReligiousOrderEntity> deleteReligiousOrderEntity(Long id){
    Optional<ReligiousOrderEntity> opt = religiousOrderRepository.findById(id)
    opt.ifPresent(religiousOrderRepository::delete);
    return opt;
}