c# intermediate classes interfaces and oop

When to use abstract classes? When to use interfaces? How to understand abstract classes? How do I understand interfaces? 1. Baidu explains the differences between abstract classes and interfaces In a word, an abstract class can

In c #, collection classes and collection interfaces are commonly used, Common collection classes: Array(Array)(That is:Differences between a set and an array) 1. arrays are fixed in size and cannot be scaled. Although the generic method System. Array. Resize can reset the Array size, this method re-creates an Array w

Item 7. Do not create generic specialization on base classes or interfaces Introducing generic methods can make it highly complicated for the compiler to Resolve Method overloads. each generic method can match any possible substitute for each type parameter. depending on how careful you are (or aren't), your application will behave very strangely. when you create generic

What is the difference between an abstract class and an interface? Why do you need an interface with an abstract class?Interfaces and abstract classes of the same point is not instantiated, the difference is that the method in the interface has no method body, and abstract class is not, except the abstract method has no method body, other methods have method body.The reason: In

classCrucian Carp: Fish { Public Override voidSwim () {//Swim like a crucian carp } } Public classCarp: Fish { Public Override voidSwim () {//Swim like a carp } } Public classGoldfish: Fish { Public Override voidSwim () {//Swim like a goldfish } } The third reason for observing the use of interfaces or the use of abstract base classes is the same, which describes the concept of multi-st

there cannot be constants, fields, operators, constructors, or destructors in an interface, and cannot contain any static members.2, a non-abstract class can inherit multiple interfaces, but only inherit a class;3, the non-abstract class can define the concrete method and the implementation, but the interface only defines the method to have no concrete realization;4, interface members must be public, and can not be declared as virtual or static, but

1. For interfaces, we only specify abstract behaviors. abstract classes often specify the "specific" data structure (attribute) and a mixture of abstract behaviors and specific behaviors. Therefore, the interface is more abstract than the abstract class, because the interface leaves more space for imagination. 2. When a non-abstract class is derived from an abstract class, the derived class provides concre

1. The interface contains attributes, methods, events, and indexers, but does not contain fields. abstract classes can contain fields. 2. The interface only contains the definition, not the implementation of the definition. Abstract classes can partially include the implementation of methods. 3. A class can implement multiple interfaces, but the abstract class

We often discuss the similarities and differences between interfaces and abstractions in our daily work. Next I will discuss this issue with you to use it as an example. I hope you will get a lot of jade. Interfaces are very similar to abstract classes, including implementation and inheritance of their own classes to i

The main purpose of my article is to introduce the principles of high quality design for a subset of classes and interfaces. These guidelines should not only ensure that the design and implementation of the class or interface itself has high-quality code, but more importantly in the industrial field should be as much as possible to update and maintain the code does not affect the customer's activities, main

Definitions of classes and interfaces: class with The class keyword is defined, and the interface is defined with the interface keyword. can use Public , the internal keyword defines the accessibility of classes and interfaces; class can be defined as abstract or sealed to control inheritance; The

The abstract class of C ++ can be used as an interface to implement Event Callback and other mechanisms. Interface implementation file idemoimpl. cpp #include Interface file idemo. h #ifndef _IDEMO_H_#define _IDEMO_H_class IDemo{public:IDemo();virtual ~IDemo();public:virtual int Add(int, int) = 0;virtual int Sub(int, int) = 0;};IDemo * GetInstance(void);#endif The client of the object can call #include "IDemo.h"int main(void){ IDemo * pDemo = G

After reading the abstract class, I think this is good. I only need to write a method body in the parent class and override it directly when the subclass is to be referenced. After learning the interface, I feel that the interface is better in this regard, because in C #, classes are inherited by a single node. If there are multiple methods, the referenced interface is good, and it is convenient to add it l

than the Hashtable object, because it implements the sort function. However, SortedList provides the convenience of access, because the element can be accessed either by index or by key. 6. NET container-related interfaces Interface Description ienumerable Implementing the Foreach statement requires implementing this interface, and the interface method GetEnumerator returns an enumerator. icollection

C # learning notes-interfaces and abstract classes, 1 namespace ClassLesson 2 { 3 class Program 4 { 5 static void Main(string[] args) 6 { 7 var person = new Person(5); 8 Console.WriteLine(person.GetAge()); 9 Console.WriteLine(Person.getFive()); //static 10 Console.WriteLine(p

= Err. Message;}Second, generic method: Public classDemo {//This is a generic method that can be used in a normal class Public Static voidSwaprefT LHS,refT RHS) {T temp; Temp=LHS; LHS=RHS; RHS=temp; } //To invoke a generic method: Public Static voidTestswap () {intA =1; intb =2; Swapint> (refArefb);//The type parameter can also be omitted, and the compiler infers the parameter. Swap (ref a, ref B);System.Console.WriteLine (A +" "+b); } }Three, generic interf

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->/* * Created by sharpdevelop. * User: noo * Date: 2009-8-19 * Time: 10: 40 * * The relationships between classes and interfaces in AO. Multiple classes inherit one interface. The controlsmapzoomintoolclass and controlsmapzoomouttoolclass

1, the interface is similar to a class, but the members of the interface are not executed, it is only a combination of methods, properties, events and indexers, and can only contain these four types of members, in addition to these four members can also be other members (such as fields).2. An interface is not instantiated, the interface includes only the signature of the member, and the class can be instantiated (except for the abstract class).3, the interface does not have a constructor, class