44、Invoicing System Design: A Case Study

Python

于 2025-09-01 16:10:38 发布

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Invoicing System Design: A Case Study

1. Introduction

In the development of an object - oriented invoicing system, we follow a specific design methodology that incorporates polymorphism. This methodology helps us break down the problem into manageable steps, from identifying objects and classes to implementing services and finally solving the overall problem.

2. Object - Oriented Design Methodology

The object - oriented design methodology consists of three main steps:
1. Identifying Objects and Classes : Highlight nouns and noun phrases in the problem description to find potential objects. Define classes for objects that can’t be represented by existing types. If classes have common attributes and pass the “is - a” t