I have 4 Classes that look like this: Why can’t I access the default implementation coming from extending Bar? Answer BarImpl can not invoke Foo’s default method explicitly, as BarImpl is not directly implementing Foo. It’s extending Bar which directly implements Foo, hence, it’s Bar’s decision to override Foo’s default method or not. BarImpl can only invoke Bar’s isEmpty() method
Tag: default-method
Spring JPA repository interface and default methods use case
I am currently wondering whether a particular use case could be elegantly addressed by using a default interface method inside a JPA repository. Suppose we have the following entity and supporting types: I need to be able to query a list of SomeEntity based on combination of Status enumeration values. With Spring JPA, its respective repository could look like this:
How to explicitly invoke default method from a dynamic Proxy?
Since Java 8 interfaces could have default methods. I know how to invoke the method explicitly from the implementing method, i.e. (see Explicitly calling a default method in Java) But how do I explicitly invoke the default method using reflection for example on a proxy? Example: Edit: I know a similar question has been asked in How do I invoke
Why is “final” not allowed in Java 8 interface methods?
One of the most useful features of Java 8 are the new default methods on interfaces. There are essentially two reasons (there may be others) why they have been introduced: Providing actual default implementations. Example: Iterator.remove() Allowing for JDK API evolution. Example: Iterable.forEach() From an API designer’s perspective, I would have liked to be able to use other modifiers on