Book Image

Mastering SAP ABAP

By : Paweł Grześkowiak, Wojciech Ciesielski, Wojciech Ćwik
Book Image

Mastering SAP ABAP

By: Paweł Grześkowiak, Wojciech Ciesielski, Wojciech Ćwik

Overview of this book

Advanced Business Application Programming (ABAP) is an established and complex programming language in the IT industry. This book is designed to help you use the latest ABAP techniques and apply legacy constructions using practical examples. You'll start with a quick refresher on language and database concepts, followed by agile techniques for adding custom code to a modern ABAP system. After this, you will get up to speed with the complete ABAP toolset for importing data to and from different environments. Next, you'll learn how to print forms and work with the different ABAP tools for Extensible Markup Language (XML) manipulation. While covering further chapters, you'll gain insights into building stunning UI5 interfaces, in addition to learning how to develop simple apps using the Business Object Processing Framework (BOPF). You will also pick up the technique of handling exceptions and performing testing in ABAP. In the concluding chapters, you can look forward to grasping various techniques for optimizing the performance of programs using a variety of performance analysis tools. By the end of this book, you will have the expertise you need to confidently build maintainable programs in Systems, Applications, and Products (SAP).
Table of Contents (25 chapters)
Title Page
Copyright and Credits
Dedication
About Packt
Contributors
Preface
Index

The static method versus the instance method


When we want to create our software in ABAP OOP technology, we need to know the differences between static and instance methods as well. The same is applicable for attributes.

Why are these differences so important? Imagine we have a car and we want to accelerate by 10 km/h. In this case, we would need to press the gas pedal for the car to accelerate. In Objects, we can describe this as using the Accelerate method, which changes the SPEED instance attribute in the instance of the CAR class.  This example shows us that an action should not be made without reference to something.

When we speak about static attributes, these can be changed without reference to any object. Also, a static method can be executed without any reference. Instance attributes or an instance method can be used only with reference to the object on which the operation is to be performed.

Instances of the same class can be created multiple times during runtime, but static attributes...