Contents
Should I always create an interface?
Avoid making changes to interfaces A class or a struct that extends an interface should implement all of its members. If the implementation changes, your code will still work. So, use interfaces only when you rarely need to change them. Also, it’s generally better to create a new interface than change an existing one.
What is the point of having an interface?
Interfaces are important because they separate what a class does from how it does it. The contract defining what a client can expect leaves the developer free to implement it any way they choose, as long as they uphold the contract.
What does @service do in spring boot?
Spring @Service annotation is used with classes that provide some business functionalities. Spring context will autodetect these classes when annotation-based configuration and classpath scanning is used.
When do you need an interface for every class?
This is the core of the YAGNI principle. When you need to be able to swap the implementation, then you introduce an interface. Creating an interface for every class is a bit overkill. From a purely object-oriented perspective, every class already has an interface.
What do you mean by interface in Java?
An interface is nothing more than the public-facing methods and data members of a class. We typically use “interface” to mean “a Java class defined using the interface keyword” or “a C++ class with only public, pure virtual functions.”
When do you do not need interface implementations?
If you only have ONE inheritance chain (baseclass->subclass) or just the base, or you have no need to actually PASS the related objects to someone else or use them generically, then you would not add interface implementations, as that notion is then useless. If you are not sure if you actually need the interfaces, then you probably don’t.
What is the point of having every service class have an?
This is because Java can simply generate interceptor objects against interfaces (see java.lang.reflect.Proxy ); doing so against concrete classes is far more tricky and filled with some non-obvious caveats when working with multiple different classloaders.
https://www.youtube.com/watch?v=4sxyDXt1igs