May 4, 2014 · Having been using Java 8 now for 6+ months or so, I'm pretty happy with the new API changes. One area I'm still not confident in is when to use Optional. I seem to swing between …

Apr 22, 2020 · Qual a utilidade do Optional do Java 8? Como se usa esse recurso? As melhores respostas que achei no site foram essas... Qual a diferença entre os métodos orElse() e orElseGet() …

Jul 29, 2015 · There are three static methods in java.util.Optional. Optional#empty() Optional#of(T value) Optional#ofNullable(T value) The pair is not of and ofNullable, but of and empty. This is because …

Feb 26, 2015 · In Java 8 you can return an Optional instead of a null. Java 8 documentation says that an Optional is "A container object which may or may not contain a non-null value. If a value is present, …

Aug 20, 2018 · I have the following code trying to use the Optional class: import java.util.Optional; // one class needs to have a main() method public class HelloWorld { public String orelesMethod() { re...

The Enum class is Serializable so there is no problem to serialize object with enums. The other case is where class has fields of java.util.Optional class. In this case the following exception is t...

Incompatible types - Found void java.util.Optional Asked 4 years, 11 months ago Modified 4 years, 11 months ago Viewed 6k times

I'd like to use java.util.Optional.orElseThrow() with an Exception type that asks for a constructor parameter. Something like this: .orElseThrow(MyException::new(someArgument)) // obviously NOT

Dec 18, 2017 · java.util.Optional has the additional methods ifPresent, filter, flatMap, and orElseThrow. java.util offers the primitive-specialized versions OptionalInt, OptionalLong and OptionalDouble, the …

Oct 13, 2021 · package com.example.repository; import org.springframework.data.repository.CrudRepository; import …