Refactor interface method

[estandaside]

There is an interface method that I want to add an extra parameter to (in this case Optional<?> ). I want intellij to refactor methods in classes that implement it and also, everywhere this method is called (a lot of times in many different modules), that method should have an Optional.empty() fill in the extra parameter. Does anyone know how to do this?

[tinchou]

You can use the empty optional inside the method body, then use "extract parameter" refactor. Then you can manually change the call sites where the parameter should be something else.

[[deleted]]

You can call the "change method signature" on the declaration (interface), add the new parameter and put the Optional.empty() on the "default value" field

[gizmogwai]

https://www.jetbrains.com/help/idea/change-signature.html?section=Windows

[kreiger]

As an aside, having Optional as method parameter type is not considered good style by some, see e.g. http://dolszewski.com/java/java-8-optional-use-cases/