Detailed analysis and answers to js prototype chain inheritance and calling parent class methods

In function inheritance, use "base class pointer" and "derived class pointer" to understand the inheritance mechanism: when the base class pointer points to the derived class object, upward transformation is performed and only the base class members are accessed. When a derived class pointer points to a base class object, a downward cast is performed (unsafe) and must be used with caution.

Inheritance error debugging tips: Ensure correct inheritance relationships. Use the debugger to step through the code and examine variable values. Make sure to use the virtual modifier correctly. Examine the inheritance diamond problem caused by hidden inheritance. Check for unimplemented pure virtual functions in abstract classes.

Detailed explanation of C++ function inheritance: Master the relationship between "is-a" and "has-a" What is function inheritance? Function inheritance is a technique in C++ that associates methods defined in a derived class with methods defined in a base class. It allows derived classes to access and override methods of the base class, thereby extending the functionality of the base class. "is-a" and "has-a" relationships In function inheritance, the "is-a" relationship means that the derived class is a subtype of the base class, that is, the derived class "inherits" the characteristics and behavior of the base class. The "has-a" relationship means that the derived class contains a reference or pointer to the base class object, that is, the derived class "owns" the base class object. SyntaxThe following is the syntax for how to implement function inheritance: classDerivedClass:pu

Inheritance and polymorphism affect the coupling of classes: Inheritance increases coupling because the derived class depends on the base class. Polymorphism reduces coupling because objects can respond to messages in a consistent manner through virtual functions and base class pointers. Best practices include using inheritance sparingly, defining public interfaces, avoiding adding data members to base classes, and decoupling classes through dependency injection. A practical example showing how to use polymorphism and dependency injection to reduce coupling in a bank account application.

Introducing the new map of Genshin Impact version 4.4. Friends, Genshin Impact 4.4 version also ushered in the Sea Lantern Festival in Liyue. At the same time, a new map area will be launched in version 4.4 called Shen Yu Valley. According to the information provided, Shen Yugu is actually part of Qiaoying Village, but players are more accustomed to calling it Shen Yugu. Now let me introduce the new map to you. Introduction to the new map of Genshin Impact version 4.4. Version 4.4 will open "Chenyu Valley·Shanggu", "Chenyu Valley·Nanling" and "Laixin Mountain" in the north of Liyue. Teleportation anchor points have been opened for travelers in "Chenyu Valley·Shanggu" . ※After completing the prologue of the Demon God Quest·Act 3: The Dragon and the Song of Freedom, the teleportation anchor point will be automatically unlocked. 2. Qiaoyingzhuang When the warm spring breeze once again caressed the mountains and fields of Chenyu, the fragrant

What is object-oriented programming? Object-oriented programming (OOP) is a programming paradigm that abstracts real-world entities into classes and uses objects to represent these entities. Classes define the properties and behavior of objects, and objects instantiate classes. The main advantage of OOP is that it makes code easier to understand, maintain and reuse. Basic Concepts of OOP The main concepts of OOP include classes, objects, properties and methods. A class is the blueprint of an object, which defines its properties and behavior. An object is an instance of a class and has all the properties and behaviors of the class. Properties are characteristics of an object that can store data. Methods are functions of an object that can operate on the object's data. Advantages of OOP The main advantages of OOP include: Reusability: OOP can make the code more

Interface: An implementationless contract interface defines a set of method signatures in Java but does not provide any concrete implementation. It acts as a contract that forces classes that implement the interface to implement its specified methods. The methods in the interface are abstract methods and have no method body. Code example: publicinterfaceAnimal{voideat();voidsleep();} Abstract class: Partially implemented blueprint An abstract class is a parent class that provides a partial implementation that can be inherited by its subclasses. Unlike interfaces, abstract classes can contain concrete implementations and abstract methods. Abstract methods are declared with the abstract keyword and must be overridden by subclasses. Code example: publicabstractcla

In PHPOOP, self:: refers to the current class, parent:: refers to the parent class, static:: is used for late static binding. 1.self:: is used for static method and constant calls, but does not support late static binding. 2.parent:: is used for subclasses to call parent class methods, and private methods cannot be accessed. 3.static:: supports late static binding, suitable for inheritance and polymorphism, but may affect the readability of the code.