With the help of Java, choose any multinational company of Pakistan and design an OOP based system in order to enhance its marketing, sales during this Covid-19 period. Select relevant two or three classes only regarding its sales, accounts, invoice or product details etc.. Also include its parameterized and non-parameterized constructor. Create its method that returns value in main and do not return any value. Also apply data encapsulation.

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OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career. 

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is: