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Java Design Principles
See additionally: Java Design Patterns
SOLID Principles
| Principle | Meaning |
|---|---|
| Single Responsablility | Class shall do only one thing, have only one reason to change. |
| Open – Close | Classes/Objects shall be: Open for extension (sub classing). Closed for modification. |
| Liskov Substitution | A subclass must be applicable without problems in any place where its super class or interface is applicable. |
| Interface Segregation | Better several small interfaces with dedicated functions than fewer interfaces with a mix of functions. |
| Dependency Injection | High level modules shall not depend on low level module. Better both modules depend on an interface. |
Other Principles
| Principle | Meaning |
|---|---|
| Don’t repeat yourself | dito |
| Encapsulate what changes | dito |
| Favor composition over inheritance | If classes in the real world has different natures then don’t solve this by putting that natures into the same class. Rather create separate classes to implement those natures. |
| Program against interfaces on implementations | dito |