inheritance

OOP (object-oriented-programming) is relative to the structural programming (Structure programming), which means that the object-oriented thinking is used for software programming. It is the most popular programming mode today. "Object-oriented"

Earlier versions of VB (1.0-3.0) did not include object-oriented features, starting with VB 4.0, the user can create a new class as a new form, as a new object. But it can only be described as a half object-oriented programming language. And vb.net

VB.net supports the inheritance of classes, allowing the user to define a class that, as a basis for inheriting from other classes, can inherit and extend the properties and methods of the base class, and the inheriting class can overload some

The user can use a new keyword "inherts" to build a new class based on a basic class, the inheriting class can inherit, extend the properties, methods, events, data members, and event handlers of the base class.VB.net introduces the following

The "Inherits" keyword can be used to make one class inherit from another class's properties, methods, events, and so on, and all classes can be inherited by default unless they are set to the "noinheritable" keyword.The following example defines

Inheritance is a very useful concept, but it's easy to use, and it's usually better to implement it with interfaces, and the purpose of this article is to make users understand how to better use the inheritance of classes.Inheritance is a good

This time, we'll give you an example of drawing some shapes on a form, such as rectangles, squares, and so on.In vb.net, controls can be redrawn by the Windows system, and users can draw their own graphics by overloading the OnPaint event.

What is an interface? An interface is a specification, a protocol (*) that allows you to write common code by agreeing to a specification. Defines a set of methods with various functions. An interface describes an ability that can have nothing to

Polymorphism was just learning C # when often heard, but never understand, presumably for many beginners is also so! Polymorphism means that different objects can perform the same actions, but through their own implementation code. See execution

More than a year ago, I went to interview an Indian company, do C + +, the treatment is good. One of the topics is let me introduce vitual base class, I haven't read the C + + textbook for a long time, suddenly Gedeng, this is a what dongdong, seems

C # Advanced (ix) C # data structure, collection C # Advanced (eight) delegate C # Advanced (vii) type cast, unboxing, boxing C # Advanced (vi) interface, interface inheritance C # Advanced (v) inheritance, derived classes, method of

Interface we have already mentioned earlier. The names of interfaces are traditionally preceded by uppercase I. We assume a situation where a system has many users, and we can query if a user exists and can modify the user's password. But one day

From the MS Visual C + + team, Andy Rich stole another trick: VC8 's implied compilation entries/d1reportsingleclasslayout and/d1reportallclasslayout. Look at a complex example (below), now suppose we want to know the object layout of the derived

This time we consider the case of multiple inheritance: class CParentA { public: 　int parenta_a; 　int parenta_b; public: 　virtual void parenta_f1() 　{ 　　parenta_a = 0x10; 　} 　virtual void parenta_f2() 　{ 　　parenta_b = 0x20; 　} }; class CParentB {

This time we add a subclass with no virtual functions for both the parent class and the subclass: class CParent { public: 　int parent_a; 　int parent_b; public: 　void parent_f1() 　{ 　　parent_a = 0x10; 　} 　void parent_f2() 　{ 　　parent_b = 0x20; 　} };

SQLAlchemy's document is a model, who called the author also developed a template language (Myghty, Mako), hehe. In fact, SQLAlchemy's documents are written in Myghty. But the system is complex, the function is many, again good document can let a

Some basic template features: Non-class parametric template The parameters declared by the template may not be class parameters, and the non class arguments that can be declared include integers (double,float cannot), enums, object references, or

Decorator (decorator) mode is also called packaging mode, the combination of the way to expand the function of the object is an alternative to the inheritance relationship. Definition Description : The decorator pattern dynamically attaches

Combinatorial reuse principle Definition: Use some existing objects within a new object to become part of the new object, and the new object can be reused for the purpose by delegating to those objects Another argument is : try to use (object)

In this section we'll talk about the Richter replacement principle, and before we talk about it, let's look at the definition. Definition: If the object O1 for each type is T1, there is an object O2 of type T2, so that all the program P defined in