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constructor, and by initializing the prototype in the constructor (only if necessary), while preserving the advantages of using both constructors and prototypes. In other words, you can determine whether a prototype needs to be initialized by checking that a method that should exist is valid.Parasitic constructor modeIf the above methods are not applicable, parasitic patterns can be applied. The core idea of this pattern is to create a function that simply encapsulates the code that creates the
Ask for PHP object-oriented design and data access design. for example, if one class Person has a database operation class ConnPerson, one operation is to buy a chicken, how should we design chicken information in the database? Whether to include the Conn class in perison, i
Ask for PHP object-oriented design and data access design. for example, if one class Person has a database operation class ConnPerson, one operation is to buy a chicken, how should we design chicken information in the database? Whether to include the Conn class in perison, i
[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
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
Object-oriented Thinking of design patterns, design patterns OO
[This article is my own learning notes. You are welcome to repost it, but please note the Source: http://blog.csdn.net/jesson20121020]
Object-oriented (OO) thinking
attribute Name: type [= default value]
Visibility method Name (parameter list) [: Return value type]
Examples are as follows: (3) The relationship between classes ① Association Relationship 1) bidirectional correlation. Examples are as follows: 2) One-way association. Examples are as follows: 3) Self-correlating. Examples are as follows: 4) Multiple sexual associations. Examples are as follows: 5) Aggregation relationship. Examples are as follows: 6) combined relationship. Simi
base classDo not let classes derive from specific classesA variable cannot hold a reference to a specific class6: Abstract Factory Method mode provides an interface for creating a family of related or dependent objects without having to specify a specific class.The factory method pattern uses inheritance: Delegate the creation of objects to subclasses, subclasses implement factory methods to create objects, and abstract factory method patterns use a combination:
Ask PHP design for object-oriented design and data accessibility
For example, there is a class person
There is a database operation class Conn
One of the actions in person is to buy a chicken, the chicken information to be put into the database
How should I design it?
is to
"/"; return NewChu ($a,$b); Break; Case"%"; return NewQuyu ($a,$b); Break; } } } $j= Gongchang::d uixiang (3,2, "%");//Test Echo $j->js ();//OutputOutput resultsSecond, the design of six major principles1. The open-close principle is that the design should have good support for the extension, and the modification should be strictly limited.2. On the Richter scale also, the subclass mu
Before all the text, I need to emphasize that I personally opposed to structure typing, so even if the content of the text "looks like" go interface, readers should not feel that I am praising go interface. What I like more is the way that Haskell and rust. Unfortunately rust and go as much as I want to shrink all the words are the shortest, the result code written to even the readability is not, the word has become a symbol. If rust the mess of pointer desi
(); T3.sayhi ();Obj3 inherits Obj2,obj2 inheritance Obj1. When our Obj3 instance object accesses Sayhi, we go to Obj3 's instance object and look for the Sayhi method (not found), then go to the OBJ3 prototype (not found), then go to the parent OBJ2 prototype (not found), and then go to the OBJ1 prototype (found). The path to finding is the prototype chain.
This is a learning record, not a tutoria
(I saw an article about the relationship between object-oriented design and database design. I think it is very good. I will post it again .)
There is no data stream in object-oriented systems. The business is completed by object
Labels: OCP Java design mode Object-Oriented Design1. Single Responsibility Principle
The core idea of a single responsibility principle is: every object in the system should have only one independent responsibility, and all objects are concerned with the completion of their own responsibilities. SRP single Responsibil
Why Study Design Patterns:1, more in-depth understanding of object-oriented thinking2, is conducive to the development of a strong extension of things What is a design pattern: a typical solution for a typical scenario that often occurs is the design pattern. For example,
1. Object-Oriented Analysis
The object of object-oriented analysis is the objective world of knowledge and modeling.
In fact, in the object-oriented analysis process is also the dem
I have been doing program design for the object-oriented design model for a short time. I recently went to several companies for an interview and was asked about the object-oriented
Sharing (six principles of object-oriented design model) and six design models
I recently read an article titled "Please call me your first brother" on the six principles of the design mode. It is simple, easy to understand and can't help but repost and share it with me !!
Legend has it that object-oriented development patterns were first created by lazy programmers. Development so far, people from the initial hot loyalty to discuss whether a certain language is enough object-oriented to now start a broader focus on object-
Seven main object-oriented design principles
Opening and closing principles : In the face of demand, changes to the program is done by adding new code , rather than changing the original title
dependency Reversal Principle : High-level modules should not rely on the underlying modules, two should be dependent on the abstract, the abstract should not rely on the
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