The provided code is a Java application demonstrating Object-Oriented Programming (OOP) concepts for managing a retail system. It consists of classes for handling suppliers, items, bills, customers, ...

One of the easiest ways to understand what is meant by ‘object oriented’, is to define what it is not. Before Object Oriented Programming (OOP) programs were written an imperative way ...

Object-oriented programming gives us modifiers, which control the visibility of members and methods. In some languages, like Java , we have modifiers such as private and public .

Today, C++, C#, Java, Visual Basic.NET and Python are popular object-oriented languages. The following compares basic OOP terms with traditional programming. See object-oriented DBMS .