![]() ![]() ![]() "Expected interface type but got %s", type. * All other methods will be handled by the supplied Interfaces can have static methods as well, similar to static methods in classes. Unlike regular interface methods, we declare them with the default keyword at the beginning of the method signature, and they provide an implementation. Interfaces can have default methods with implementation in Java 8 on later. 5 Answers Sorted by: 33 If youre using Mockito, the simplest way to unit-test a default (AKA 'defender') method is to make a spy 1 using the interface class literal 2. Something like this: public interface IntProvider methods will be called directly. Like regular interface methods, default methods are implicitly public there’s no need to specify the publicmodifier. In other words, you can say that interfaces can have abstract methods and variables. It is used to achieve abstraction and multiple inheritances in Java using Interface. There can be only abstract methods in the Java interface, not the method body. Now how can we unit-test these default methods?Ī naive approach would be: in your unit test class, just implement the interface and test the default method on that interface. The interface in Java is a mechanism to achieve abstraction. These methods are implemented in the interface, but can be overridden. Instead of that I was also thinking to change MyIFace to have method Logger getLogger() so that the implementing classes must return what comes with Slf4j. The only way to do is then to declare it without Lombok and as public. Interface methods are by default abstract and public Interface attributes are by default public, static and final An interface cannot contain a constructor (as it cannot be used to create objects) Why And When To Use Interfaces 1) To achieve security - hide certain details and only show the important details of an object (interface). ![]() So, if a developer wanted to add a new method to an interface, then the implementation code must. Interface attributes are by default public, static and final An interface cannot contain a constructor (as it cannot be used to create objects). Developers had to provide the implementation of these methods in a separate class. Before default methods in Java 8, interfaces could only have abstract methods. Java 8 has introduced a nice feature, default (so-called “defender”) methods in interfaces. Yes, I see it now, thanks for the delombok. The default methods were primarily introduced to resolve compatibility issues in Java. ![]()
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