Default & Static Methods in Interfaces

Default methods have a body in the interface and enable backward-compatible API evolution; static methods are interface-scoped utilities called via InterfaceName.method() and are not inherited.

When two interfaces define the same default method, the implementing class must override it and can delegate to one using InterfaceName.super.method(); class wins over interface, sub-interface wins over super-interface.

Interface static methods are called via InterfaceName.method() only, are not inherited by implementing classes, cannot be overridden, and replace companion utility classes.