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How OOP Structures Code with Classes and Objects

Object-oriented programming (OOP) is a programming paradigm that organises the structure of applications around the relationships and characteristics of data objects and the methods (functions) used to manipulate those objects. OOP is based on four main principles: encapsulation, inheritance, polymorphism and abstraction. Encapsulation ensures that the data in an object cannot be accessed or modified directly but must be done so using approved methods; Inheritance allows for the reuse of existing class and object functionality while eliminating redundancy; polymorphism provides greater flexibility in how different objects react to the same operation; and abstraction simplifies complexity by providing the necessary information about an object or process without exposing unnecessary information. 

These principles of OOP allow for greater code reusability, more effective long-term maintenance and clearer designs of an overall system. The fact that OOP provides a structure which matches closely to how humans tend to think about problems makes it widely adopted within many applications and industries, with programming languages such as Java, C++, Python and C# all implementing OOP as part of their design and construction language.