Why are interface variables public static final?
The short answer is that interface variables are intended to be Java constants, which means they must have these universal and un-changable properties. Interface variables are implicitly public because interfaces are intended to provide an Application Programming Interface (API) that is fully accessible to Java programmers to reference and implement in their own applications. Since an interface may be used in Java packages that are different from their own, public visibility ensures that program code can access the variable. Interface variables are static because Java interfaces cannot be instantiated in their own right; the value of the variable must be assigned in a static context in which no instance exists. The final modifier ensures the value assigned to the interface variable is a true constant that cannot be re-assigned by program code. Actions: Follow-up or correct this answer. Submit a new question.
