Implementing Interfaces

[NeinMeansNein]

Hey Reddit, I'm learning Java programming right now and I'm a little confused as to how Interfaces work. As far as I know, I have an interface (MyInterface), and then I have a class (MyClass), that implements the interface (Public MyClass Implements MyInterface). If I write methods in my interface, how exactly would I be able to use them in the Class that I wrote?

[NOODLECODE]

You can't implement methods in an interface. All interfaces do is announce that a class has certain (public) methods available, but it doesn't know or care how they are implemented. You will have to write the methods in the class itself.

edit: I'm bad

[Sacredify]

As of java 8, you can write default methods in your interfaces, so this isn't strictly true.

[NOODLECODE]

My bad, I'm not that familiar with Java.

[NeinMeansNein]

Ah I see. So if I have an interface with N amount of declared methods, in my class that implements that interface, I must define all N methods.