10 recommended articles about external classes

This article mainly introduces the calling methods of the C# interface in derived classes and external classes. It analyzes the definition and specific usage of the C# interface in the form of examples. Friends in need can refer to the examples in this article to describe the use of C# interfaces in derived classes. Calling methods in classes and external classes. Share it with everyone for your reference, the details are as follows: C# interfaces are created through the interface keyword, and the interface can contain member variables such as properties and methods. Derived classes of interfaces can implement methods in the interface. A class can inherit multiple interfaces to implement the methods in these interfaces, and an interface can also derive multiple classes. The methods in the interface can be implemented by one or more of these classes. The methods in the interface can be called directly in the derived class of the interface. Example of calling in a derived class: //Interface public interface IPersonalService { //Methods in the interface PersonalDTO QueryByUid(int uId)

1. Detailed explanation of C# interface calling method examples in derived classes and external classes

Introduction: This article mainly introduces the calling methods of C# interface in derived classes and external classes, and analyzes the definition and specific usage of C# interface in the form of examples. It needs Friends can refer to

2. Java access permission control - take you to learn more about protected keywords (picture)

Introduction: Within a class, whether its members can be accessed by other classes depends on the modifier of the member; and whether a class can be accessed by other classes The class accessed depends on the modifier of the class. There are four types of class member access permission modifiers in Java: private, package access permission, protected and public, among which only package access permission and public can modify an external class. Many Java books introduce protected in a general way, which may cause misunderstandings. This article focuses on revealing the connotation and usage of the protected keyword, and introduces some other modifiers.

3. java internal classes detailed explanation

# #Introduction: Java internal class refers to a class defined inside another class, and the methods in it can access the domain containing their external class. This is a relatively complex technology, and internal classes are mainly used to design classes that have collaborative relationships. Especially it has been widely used in java processing GUI events. In addition, the most common reasons for inner classes are as follows: Inner class methods can access data in the scope where the class is defined, including private data Inner classes can be hidden from other classes in the same package It is very convenient to define callback functions using anonymous inner classes

4. 04.Java Basics - Classes

Introduction: Overview In Java, a class can be defined in another class or in a method. Such a class is called an inner class. Inner classes in a broad sense generally include these four types: member inner classes, local inner classes, anonymous inner classes and static inner classes. Member inner classes 1. Concept member inner class is the most common inner class, and it is defined as located in Internal of another class 2. Instance/*** External class*/class Outter { private int a = 10; static int b =

01.Java Basics - Encapsulation

Introduction: Overview of the three major characteristics of Java object-oriented: encapsulation, inheritance and polymorphism, and encapsulation and inheritance basically serve polymorphism. Encapsulation is an important principle of object-oriented methods, which is to combine the properties and operations (or services) of an object into an independent whole and hide the internal implementation details of the object as much as possible. The above is Baidu Encyclopedia's explanation of encapsulation, which is actually to privatize the member variables of the class and provide public methods to access these member variables. If a member variable is declared as a private member, then it cannot be directly accessed through the external class, thereby reducing the member variable

6. The private modifier in Java is invalid

Introduction: This article mainly introduces the private modifier in Java is invalid? This article discusses the phenomenon that private member variables or methods of an external class can be accessed in an internal class. Friends in need can refer to

7. Inner classes in Java The use of

Introduction: The role of inner classes 1. Internal classes provide better encapsulation, which can Hide the inner class inside the outer class and do not allow other classes in the same package to access it. 2. The methods of the inner class can directly access all data of the outer class. 3. More convenient to use.

8. Usage of inner classes and anonymous inner classes

##Introduction: The inner class can call the method of the outer class. If the inner class has a method with the same name, it must be called using the "OuterClass.this.MethodName()" format (where OuterClass and MethodName are replaced by the actual outer class name and its method) ; this is a keyword, indicating a reference to the external class); if the internal class does not have a method with the same name, you can directly call the method of the external class. However, peripheral classes cannot directly call private methods of inner classes, and external classes cannot directly call private methods of other classes. Note: The permission of the inner class to directly use the outer class has nothing to do with whether the method is static. It depends on whether the inner class has a method with the same name.

9. java inner class Some summary

Introduction: Internal class refers to defining a class inside an external class. The class name does not need to be the same as the folder.

10. java inner class final semantic implementation

Introduction: This article describes that in java internal classes, variable information of external classes is often referenced. However, there is no corresponding clue on the surface as to how these variable information are passed to the inner class. This article describes how these semantics are implemented in inner classes from the bytecode level.

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