Advantages and Disadvantages of Interfaces

Advantages :

• Clients are unaware of the specific class of the object they are using .
• One object can be easily replaced by another
• Object connections need not be hardwired to an object of a specific class,
  thereby increasing flexibility
• Loosens coupling
• Increases likelihood of reuse
• Improves opportunities for composition since contained objects can be of
  any class that implements a specific interface

Disadvantages :

• Modest increase in design complexity