super why toys

java keyword This, super use summary First, this The Java keyword This can only be used in a method method body. When an object is created, the Java Virtual Machine (JVM) assigns a pointer to the object that refers to itself, which is the name of this pointer. Therefore, this can only be used in non-static methods in the class, static methods and static code blocks must never appear in this, which is explained in the article "Java keyword static, fin

First of all, we have a question about the Python super class in StackOverflow as the beginning of this article, the problem is basically this:>>>classA (object): ...def __init__(self): ...Print "A Init"... super (a,self) .__init__()... >>> >>> A =A () a init>>>classB (object): ...def __new__(self): ...Print "B New"... super (b,self) .__new__()... >>> >>> B =B ()

Super is used to solve multiple inheritance problems, it is not a problem to call the parent class directly with the class name when using single inheritance, but if multiple inheritance is used, it involves various problems such as lookup order (MRO), repeated invocation (Diamond inheritance). In short, the experience left behind is: to maintain consistency. Either call the parent class with the class name, or use

Note: python3 is the runtime environment. The example is taken from Chapter 8th of pythoncookbook. In python, there are two main methods to initialize the parent class if the subclass is to be implemented. The first method is to directly use the parent class name, and the second method... quot; gt; lt; metaname quot; keywords quot; content quot; call details of pythonsuper in multi-inheritance. note: python 3 is the runtime environment, the example is taken from Chapter 8th of python cookb

Summarize the keyword this and the super usage. AUTHOR:ZJ 07-3-12blog: [Url]http://zhangjunhd.blog.51cto.com/[/url]1. What is super? What is this? The Super keyword denotes the meaning of the super (parent) class. The This variable represents the object itself. 2. Use Superthis to call member variables and methods you

Two special variables in Java: this and super -- general Linux technology-Linux programming and kernel information. The following is a detailed description. There are two very special variables in Java: this and super. These two variables do not need to be declared before use. This variable is used inside a member function and points to the current object. The current object refers to the object that calls

Class A:def __init__ (self):Print "Enter A"Print "Leave A"Class B (A):def __init__ (self):Print "Enter B"a.__init__ (self) # old methodPrint "Leave B">>> B = B ()Enter BEnter ALeave ALeave BThe disadvantage of this is that when the parent class of a subclass changes (such as when the parent class of Class B changes from A to C), the entire class definition must be traversed, replacing all the class names of the unbound methods.Since Python 2.2, Python has added a keyword

Python super I. Problem Discovery and Proposal In the method of a Python class, to call a method of the parent class, before Python 2.2, the usual method is as follows: Code Segment 1: Class:Def _ init _ (self ):Print "enter"Print "leave" Class B ():Def _ init _ (self ):Print "enter B"A. _ init _ (self)Print "leave B" >>> B = B () Enter BEnterLeaveLeave B That is, use non-bound class methods (Methods referenced by class names), and introduce the objec

Python 2.2, Python has added a keyword "super" to solve this problem. The official documentation for python 2.3 is as follows: Super (type [, object-or-type]) Return the superclass of type. If the second argument is omitted the super objectReturned is unbound. If the second argument is an object, isinstance (OBJ, type)Must be true. If the second argument is a ty

Super Rabbit optimization Wang software is a powerful system optimization software developed by Super Rabbit for beginners after three years of improvement. In the latest version 5.0, all Optimization-related functions are available, allowing anyone to easily connect to their own computers. Whether you are using Windows 95/98/me or Windows 2000/XP, the optimizer can automatically analyze the system and prov

custom initialization method, which has more limitations. Then it [class alloc] init] will be more convenient, of course, [class alloc] init] the design is due to historical reasons.Why do you write that? 1234567 - (instancetype)init { if (self = [super init]) { //Custom initialization } return self ; } We know that we are alloc returning a valid uninitialized object instance. For self alloc pointers that are return

also due to historical reasons.Why do you write that?- (instancetype) init{ if (self = [Super init]) { // Custom Initialization } return self ;}We know that Alloc returns a valid uninitialized object instance. For self is a pointer returned by Alloc and can be accessed within all method scopes.But for super, it's just a "compiler indicator" that tells the compiler to search for the impleme

This and super must be placed in the first row of the constructor, because the initialization action is done first.The first row in the constructor in the parent class also has an implicit super () statement, which points to the parent class of all classes, object./////////////////////////////////////////////////////////////////////////////////////////////////////////////// /////////////////////////////////

1 /*2 Super Keyword:3 4 The Super keyword represents a reference to the parent class space. 5 6 The Super keyword works:7 1. When the child parent class has a member with the same name, the child class is accessed by default as a member of the subclass, and the members of the parent class can be accessed through the Super