Classes should be open for extension, but closed for modification. that is, such an entity can allow its behavior to be extended without modifying its source code.
Open-Closed principle
-Goal is to allow classes to be easily extended to incorporate new behavior without modifying existing code.
- There are ways of "inheriting" behavior at run-time through composition and
-IT is possible to add multiple new responsibility to objects, through this technique, including responsibilities that were not even thought of by the designer of the super class. and you don't have to touch their code.
-Code should be closed for modification, yet open for extension
- Takes time and effort to make code this flexible
- must be careful when choosing the areas of code that need to be extend; applying the open-closed principle EVERYWHERE is wasteful and unnecessary and can lead to complex hard to understand code.
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