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Lesson 1

Basic Java mapping

When you are given a system, either to implement or to access, it is very important to have well-defined interfaces between system elements.

Defining interfaces
Well-defined interfaces allow for solid encapsulation of implementation and modular development practices. All you need in order to write part of a system are the interfaces to that part of the system and the interfaces to the other parts of the system that your part uses. The language, patterns, and vendors you use from there on should be up to you, the implementer.
IDL interface
It is important to be able to see the interface in a common form and to know how to use it with respect to the language and vendor choices you have made. In practical terms, to use an Interface Definition Language (IDL) interface, you must map the IDL interface to an interface, class, or whatever is appropriate in the chosen implementation language. Some of these language mappings have been standardized by the Object Management Group (OMG). In this course, we will cover the OMG IDL mapping to Java. In this module, we will cover the most basic elements of the mapping, mainly from the viewpoint of an application client implementer.

Module objectives
By the end of this module you will know how to:
  1. Describe the mapping of an IDL module in Java
  2. Describe the mapping of an IDL constant in Java
  3. Describe the mapping of an IDL typedef in Java
  4. Describe the mapping of interface operations with in, out, and inout parameters in Java
  5. Describe the mapping of interface attributes in Java
In the next lesson, you will learn how to describe the mapping of an IDL module in Java.