Six object-oriented design principles

1. Switch Principle
Software entities shocould be open for extension, but closed for modification. The software must be open to extensions and closed to modifications.
2. Lee's replacement principle
Any base class may appear.
3. reversal Principle
It depends on abstraction, not on reality.
4. Principles of synthesis/aggregation multiplexing
We should try to use synthesis/aggregation instead of inheritance relationships for reuse purposes.
5. The limit law
A software entity should interact with other entities as little as possible
6. Interface isolation principles
The client should be provided with as few separate interfaces as possible, rather than a large loyal Interface