Object Oriented Programming Through Java by Pearson

6.26 Inheritance: Packages: Interfaces

required method is invoked by a reference to interface. The similarities and differences are

high lighted in Table 6.3.

6.15.3 Variables and Methods in Interfaces

In interface declaration creates a reference type in Java. An interface declaration is similar to a

class declaration, with the following two very important differences:

• All of the methods in an interface are abstract. Every method declaration in an interface

specifies the name, arguments and return type of the method, but it does not include

an implementation of the method.

• All of the variables in an interface are static and final.

A method ...