Advantages of OOP Object-Oriented Programming has the following advantages over conventional approaches: OOP provides a clear modular structure for programs which makes it good for defining abstract datatypes where implementation details are hidden and the unit has a clearly defined interface. OOP makes it easy to maintain and modify existing code as new objects can be created with small differences to existing ones. OOP provides a good framework for code libraries where supplied software components can be easily adapted and modified by the programmer. This is particularly useful for developing graphical user interfaces.