Answered: // The language is Java programing…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

// The language is Java programing

What is an operation or business class? What is a driver class, or driver code, or testing class? What is reason to separate business class from the driver code? Use example foe better understanding.

Expert Solution

Step 1

Class:

A class is a blueprint from which objects are created.
The class is a prototype which represents a set of properties and methods that are common for all the objects of the class.
The declaration of class includes modifiers, class name, body of the class.

Step 2

Business class:

Business class contains the actual logic or work of the program.
It is also called operation class, because it hold the actual operations that are accomplished by the program.
It is designed for specific operation.

Step 3

Driver class:

The driver class contains the main function of program.
It is responsible for launching operations in a program.
It is responsible for converting user program into physical execution unit termed as task.
Each function should be designed, coded and tested as a separate unit from rest of the program.
It denotes a testing program for the functions or statement that is been written in code. Because of this driver class also called test class.
It tests the functionality usually for debugging and code verification.

Step 4

Reason for separating the business and driver class:

The main reason to separate the business and driver class to enable more clarity about the program and test the individual functions.
The separation also enables reusability of business class.
It provides an efficient way to test all the functions and work of the program.

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