SOLID Design Principles

In object-oriented computer programming, SOLID is a mnemonic acronym for five design principles intended to make software designs more understandable, flexible and maintainable.

  1. Single Responsibility Principle

    A class should only have a single responsibility, that is, only changes to one part of the software’s specification should be able to affect the specification of the class.

  2. Open Closed Principle

    Software entities should be open for extension, but closed for modification.

  3. Liskov substitution principle

    Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.

  4. Interface Segregation Principle

    Many client-specific interfaces are better than one general-purpose interface.

  5. Dependency Inversion Principle

    One should depend upon abstractions, rather than concrete implementations.