在java中使用可选时如何在条件块中放置空检查？

Question

this is the code

Optional<Buyer> buyerOptional = Optional.ofNullable(buyerRepository.findById(buyerId).orElse(null));
Buyer buyer = buyerOptional.get();
if (buyer != null) {
    
} else if (buyerOptional == null) {
    response = utility.createResponse(500, KeyWord.ERROR, "Invalid buyer");
}

I want to get inside else if block, would be great if I could get any suggestion on this.

Answer 1

First of all, you don't need to create Optional again as findById already return Optional . And you can use isPresent() to check if value present or not.

Optional<Buyer> buyerOptional = buyerRepository.findById(buyerId);
if (buyerOptional.isPresent()) {
   Buyer buyer = buyerOptional.get();
   ... // preparing response
} else {
    response = utility.createResponse(500, KeyWord.ERROR, "Invalid buyer");
}