1 - ABAP OOPS - Introduction

Summary

This video introduces ABAP object-oriented programming (OOP) fundamentals, explaining that OOP centers on classes and objects. It defines a class as a collection of elements—methods, attributes, events, interfaces—and an object as an instance or result of a class, illustrated with a phone (Samsung vs iPhone) example. The presenter distinguishes global classes (reusable across programs; created via transaction SC24) from local classes (program-specific; created inside programs or via SC38). Finally, four global class types are outlined: usable (regular) classes, exception classes, persistence classes for database operations, and unit test classes. The next video will create a usable ABAP class.

Takeaways

• 😀 OOPs (Object-Oriented Programming System) is based on two main concepts: Class and Object.
• 😀 A class is a collection of objects, and an object is an instance or result of a class.
• 😀 In OOPs, methods, attributes, events, interfaces, and friends can all be part of a class.
• 😀 A simple example of a class is a 'Phone,' with objects like 'Samsung' and 'iPhone,' where each object has properties like width and height.
• 😀 There are two types of classes in ABAP: Global Class and Local Class.
• 😀 A Global Class can be reused across multiple programs, whereas a Local Class is restricted to the program it’s created in.
• 😀 SC11 is used to create reusable structures, similar to how SC24 is used to create Global Classes in ABAP.
• 😀 Local Classes are created in a program using the `types` statement and can only be used within that program.
• 😀 Four types of Global Classes exist in ABAP: Usual ABAP Class, Exception Class, Persistence Class, and Unit Test Class.
• 😀 SC24 is the transaction code used for creating Global Classes, while SC38 is used for Local Classes in ABAP.
• 😀 The Usual ABAP Class in OOPs is similar to a Function Module in Core ABAP, used to write business logic.

Q & A

What does OOPS stand for?

OOPS stands for Object-Oriented Programming System.

What are the two main concepts of OOPS?

The two main concepts of OOPS are classes and objects.

How is a class defined in OOPS?

A class is defined as a collection of objects. It can include methods, attributes, events, interfaces, and friends.

What is an object in OOPS?

An object is an instance or result of a class. It represents a specific implementation or example of the class.

Can you give an example to explain the relationship between class and object?

Yes. For example, if we have a class called 'Phone', the objects could be 'Samsung' and 'iPhone'. Both have properties like width and height, but they belong to the same class 'Phone'.

What are the two types of classes in ABAP OOPS?

The two types of classes in ABAP OOPS are Global Classes and Local Classes.

What is a Global Class in ABAP?

A Global Class is reusable across multiple programs. It is created using transaction code SE24 and can be used anywhere within the system.

What is a Local Class in ABAP?

A Local Class is created within a single program using transaction code SE38. It cannot be reused in other programs.

What are the four types of Global Classes in ABAP?

The four types of Global Classes in ABAP are: (1) Usual ABAP Class, (2) Exception Class, (3) Persistence Class, and (4) Unit Test Class.

What is the purpose of a Usual ABAP Class?

A Usual ABAP Class is used to write and execute logic, similar to function modules in core ABAP programming.

What is the role of an Exception Class in ABAP?

An Exception Class is used to raise and handle exceptions, allowing for better error handling in programs.

What is a Persistence Class used for?

A Persistence Class is used for performing database operations such as insert, update, and delete, similar to SQL commands in core ABAP.

What is the function of a Unit Test Class in ABAP?

A Unit Test Class is used to write and run unit test cases to validate the correctness of code implementations.

Which transaction code is used to create Global Classes in ABAP?

Global Classes are created using the transaction code SE24.

Which transaction code is used to create Local Classes in ABAP?

Local Classes are created within a program using the transaction code SE38.