学步园

GOLDEN RULE(s) of design pattern

1. Client should always call the abstraction (interface) and not the exact implementation.
2. Future changes should not impact the existing system.
3. Change always what is changing.
4. Have loose coupling
   • Inheritance ( Very coupled )
   • Composition
   • Aggregation
   • Association
   • Dependency
   • Realization ( Least couple )