Sams Teach Yourself Java™ in 24 Hours, Sixth Edition

Defining a Service Endpoint Interface

The first step in the creation of a JAX-WS web service is to create a Service Endpoint Interface, a Java interface that defines the methods that clients can call when they’re using the web service.

The SquareRootServer web service you are developing this hour is a service that can handle two simple tasks:

• Calculating the square root of a number

• Displaying the current date and time

An interface is a set of methods that provides names, arguments, and return types but does not contain code that implements the methods. The interface serves as a contract between objects—if an object implements an interface, other objects know they can call all the interface’s methods on that object.

In Hour 15, “Responding ...