Design Patterns - How They Solve Problems PDF download

Strict modeling of the real world leads to a system that reflects today’s realities but not necessarily tomorrow’s.

One very important aspect of design patterns is the interface. An object’s interface everything that is “visible to the outside” (name, variables, functions, parameters, return values).

Objects are only known through their interfaces.

Two objects having completely different implementations can have identical interfaces.

These two statements are key to understanding Design Patterns.

Another key statement is “design for change!”