Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 months ago. Improve this question First of all, allow me to explain a “behaviour” that I observed, then I will as…
Tag: inner-classes
What nested class type is best suitable for Domain Events?
I am following Domain Driven Design and Clean/ Hexagonal architecture in my Java microservice. I have domain events declared in my aggregate root class as non-static nested classes. My question is whether these classes should be static nested classes or non-static nested classes(inner classes)? I used non-sta…
How to show that a Catch block for the Parent-exception will handle subclasses as well
I have met this problem. I have created a class CatHandler, with 3 inner classes (ExceptionAlpha extends Exception, ExceptionBeta extends ExceptionAlpha, ExceptionGammer extends ExceptionBeta). These three exception subclasses are empty; they contain no code. All code should be written in CatHandler. Now the …
Could not find @BeforeEach setup() method on @Nested test class in @QuarkusTest
summary On Junit Jupiter the Quarkus test extension seems to not find @BeforeEach setup methods for nested test classes and produces an error: java.lang.RuntimeException: Could not find method void com.stackoverflow.examples.nestedtestwithquarkus.NestedTestWithQuarkus.setup() on test class Is that a bug, a fe…
Why compiler cannot infer generic types of the inner class in Java?
When the above code snippet is compiled, it leads to Compile-Time error saying “incompatible types: cannot infer type arguments for A.InnerA<>. It seems to me that the Compiler should be able to infer the types to be InnerA<String>. Why is it not able to do so? It would be helpful if someone…
How can I access OuterClass field from InnerClass?
I’ve been learning Java and OOP for a few weeks now. Yesterday I learned inner class and outer class. I want to know the way to access field of outerClass from InnerClass when they have exactly same name. Like below, It is possible to access field of outerClass from innerClass when they have different n…
Java Swing unable to remove a component
I am trying to build a quiz game that rerender itself after user click on the button with answer. I have added an action listener to 4 buttons. When the button is clicked, it is suppose to reach the outer class which extend JFrame and remove the QuestionPanel that extends the JPanel. And then create a new Que…
Java Inner Classes
I’m new to Java and have the following question regarding inner classes: When implementing an inner class, do I need to declare its attributes and methods scope i.e. public, private, protected? EDIT: With the absence of delegates (as in C#) could someone mention how best to implement a messaging system …
Problem with Inner Class. Illegal Start of Expression error
I am practicing using inner classes but am having difficulty with a homework question: It is as follows: Create a Swing component class BetterButtons that extends JPanel and has three Jbutton instances labelled “One”, “Two”, and “Three”. In the constructor of BetterButtons,…