Yahoo! JAPAN

2015/3/2 -An Optional always contains a non-null value or is empty, yes, but you don't have an Optional, you have a reference of type Optional ...

2017/6/14 -If null handling is very important, use an Optional. If null is a valid return that does not indicate unavailability or failure, use an Optional ...

Avoid Using null for Optionals: When you have a variable or a method that may or may not have a value, it's a best practice to use the Optional class to wrap ...

A container object which may or may not contain a non-null value. If a value is present, isPresent() will return true and get() will return the value.

2016/2/3 -Optional is used with the convention that methods with return type Optional never return null and usually also with the (less strong) convention ...

2026/2/26 -When getting an Optional return type, we're likely to check if the value is missing, leading to fewer NullPointerExceptions in the applications.

2024/9/7 -The orElse() method in the Optional class provides a mechanism to return a default value if the Optional contains no value. If the Optional is ...

Because with Optional the type tells the caller that it might not return a value. With null, you have no idea if you need to check for null or not. Being able ...

2023/2/1 -You can use Optional.orElse() to specify a default value to return if the Optional is empty. This can make your code more resilient and reduce ...

2020/4/11 -I'd like to propose that we start using Optional as return values in our APIs, in order to make it clear the user that the value can be null.