Interface - Java for Beginners - page 39

Interface
It is similar to class which contains constants, methods and signatures.
Java simple calculator interface
Interface for java
Declaration
Access interface m
{
Return method 1 (parameter list);
Return method 2 (parameter list);
Type final variable name 1 = value;
Type final variable name 2 = value;
//…
Return type method name n (parameter list);