A client should never be forced to implement an interface that it doesn’t use

OR

clients shouldn’t be forced to depend on methods they do not use.

  • If a given interface has more features than you require, create a new interface that includes only the functionality that your client code requires, and which you can implement fully.
  • The Interface Segregation Principle (ISP) states that clients should not be forced to depend on methods that they do not use.

 

Don't Depend on What You Don't Use

Reference Example