design patterns elements of reusable object oriented software

Seven principles: Open and close principle, Richter substitution principle, dependency reversal principle, synthesis/aggregation multiplexing principle, Dimitri rule, interface isolation principle, single duty principle.The open and closed principle is the cornerstone of object-oriented reusable. The other six principles are instruments and tools.Details of the r

coupling (Low coupling)Loosely coupled as a principle of evaluation system design, the responsibility lies in: Reduce dependencies between classes and classes Change the impact of a class to other classes to minimize Higher reusability Polymorphic (polymorphism)In an inherited system, a different invocation is produced at run time using the same design-time definitionProtected changes

Rule 1 : Give priority to (object) combination, rather than (class) Inheritance [Favor composition over inheritance] Combination N(Object) is a combinationCombinationTo obtain the reuse method of new functions. NDelegates a feature to a combined object to obtain the new feature. NSometimes it is also called "aggregation "(Aggregation) Or "inclusive

[Favor composition over inheritance] Combination 1. (object) combination is a method of reusing new functions by creating an object that combines other objects. 2. delegate the function to a combined object to obtain the new function. 3. Sometimes it is called "aggregation" or "inment", although some authors give special meanings to these terms 4. For example: A

Just like the location of Newton's three major laws in classical mechanics, the open-closed principle is the cornerstone of object-oriented reusable design (Object Oriented Design or OO

patterns (principles)Dry–don ' t Repeat yourselfOur first object-oriented design principle is: DRY, from the name you can see that DRY (don ' t repeat yourself) means not to write duplicate code, but to abstract it into reusable blocks of code. If you have two or more block

patterns (principles).Dry–don ' t Repeat yourselfOur first object-oriented design principle is: DRY, from the name you can see that DRY (don ' t repeat yourself) means not to write duplicate code, but to abstract it into reusable blocks of code. If you have two or more bloc

Object-oriented design principles are at the heart of oops programming, but most of the Java programmers I've seen are enthusiastic about design patterns like Singleton (singleton), Decorator (adorner), OBSERVER (Observer), Instead of focusing enough attention on learning

Object-oriented design is divided into two stages, namely high-rise design and low-level design High-level design The overall model of development software for the development of the system in the high-rise

object-oriented three elementsPackage (encapsulation)Inheritance (inheritance)Polymorphic (polymorphism)Object-oriented Five principlesSingle Responsibility principle (SRP)Open-Close principle (OCP)Liskov substitution principle (LSP)dependency Inversion principle (DIP)Interface Isolation principle (ISP)