Java 17 Quick Syntax Reference: A Pocket Guide to the Java SE Language, APIs, and Library

© Mikael Olsson 2022

M. OlssonJava 17 Quick Syntax Referencehttps://doi.org/10.1007/978-1-4842-7371-5_18

18. Interface

Mikael Olsson¹  

(1)

Hammarland, Länsi-Suomi, Finland

 

The interface type is used to specify methods that classes using the interface must implement. These methods are created with the interface keyword followed by a name and a code block. Their naming convention is the same as for classes, with the first letter of each word capitalized.

interface MyInterface {}

When an interface isn’t nested inside another type, its access level can be either package-private or public, just like any other top-level member.

Interface Members

The code block for an interface can, first of all, contain signatures for instance methods. These methods don’t ...