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------Super keyword------Super Purpose: Access superclass "hidden member variables (whether static or not) and static methods" and "overridden instance methods" in subclasses. The superclass here must be a "direct superclass", the most recent superclass above the subclass.How to use Super:① calls the constructor of the superclass in the subclass construction meth

1. Subclass constructors If you want to refer to super, you must put super in the first place of the function. class Base {base () {System.out.println ("base"); }} public class Checket extends Base {checket () {super ();//Call the constructor of the parent class, be sure to place the first statement of the method System.out.println ("Che Cket "); } public s

1. Constructor of subclass if you want to refer to super, you must put super at the top of the function Copy Code code as follows: Class Base { Base () { System.out.println ("Base"); } } public class Checket extends Base { Checket () { Super ();//Call the Parent class construction method, be sure to place the first statement

.The non-parametric null constructor that the system automatically adds in the parent class is explicitly written out (in order to have the output, add println):[Java]View Plaincopy Class base{ Base () { System.out.println ("base constructor"); } } Class derived extends base{ public static void Main (string[] args) { Derived d=new derived (); } } Output: base constructor, code compiled. From the example, it seems that subclasses can inherit t

First, this usageConcept: This is an object of its own, representing the object itself, which can be understood as: A pointer to the object itself.The usage of this can be roughly divided into three types in Java:　　1. Direct reference to ordinary objects: this corresponds to the current object itself.2. Use this to distinguish between members whose names are duplicate.　classPerson {Private intAge = 10; PublicPerson () {System.out.println ("Age of Initialization:" +Age );} Public intGetage (int

use super in the JAVA class to refer to the composition of the parent class, using this to refer to the current object. If a class inherits from another class, we will have a parent class object in the subclass object when we new the instance object of the subclass. How do you refer to the parent object inside? Using Super to refer to, this refers to a reference to the current object, and

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

I recently encountered some questions about super when I was studying java. At first I saw that super had no idea. I found some information and studied it: In Java, sometimes the member variables or methods in the subclass have the same name as the member variables or methods in the parent class. Because the member variables or method names in the subclass have a high priority, the member variables or metho

This article summarizes the usage of super keywords in Java. There is a reference to the parent class object mentioned in the book. (I have a bit doubt about this statement. If it indicates the reference of the parent class object, it should be said as follows: System. out. println (super); can output the representation of the parent class object. However, the above sentence output is incorrect, while Syste

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

one, in Java, there are usually two ways to use the Super keyword:1. In the subclass of the constructor (initialization), the main call is the default constructor of the parent class, if the parent class has more than one construction method, you can specify a specific constructor by super, such as Super (paras);2. Use a subclass to invoke a hidden or overridden

Getting Started with super ()In the inheritance of a class, if you redefine a method that overrides a method of the same name in the parent class, but sometimes we want to be able to implement the function of the parent class at the same time, we need to invoke the parent class's method, which can be achieved by using super, such as:class Animal(object): def __init__(self, name): self.name = name

Java programming-this and super 8.8 this and super The following describes how to use the this and super keywords. By using the this and super keywords in a program, you can easily reference a lot of content inside the class and understand the implementation principle of object-oriented, it is easier to understand the

Jane's going to talk Super VLAN-conserving IP address isolation two layer communication VLAN aggregation in the implementation of the different Sub-vlan to share a subnet segment address, but also brought Sub-vlan between the three-layer forwarding problem. Want to do the DHCP server must do in the Super-vlan up[Huawei]vlan Batch 2 to 4 100[Huawei]vlan 100[Huawei-vlan100]aggregate-vlan//Configure the curren

Some people may think that why is there a super function in Python that can directly call the parent class method through the parent class name? In fact, many people have misunderstandings about the super function in Python, this article introduces the correct understanding and usage of the super function in Python programming. when the subclass needs to call the

This article mainly introduces the differences between super () and _ init _ () in the python class. This article is very detailed and has some reference value, you can refer to the functions implemented by super () and _ init _ () when inheriting a ticket. class Base(object):def __init__(self):print 'Base create'class childA(Base):def __init__(self):print 'creat A ',Base.__init__(self)class childB(Base):

Look at the code:@implementation son:father-(ID) init{ = [Super init]; if (self) { } return to self ;}What is self and what is super ?In dynamic methods : Self stands for "object"; In static methods : Self stands for "class"; One sentence summary is: Selfrepresents the caller of the current method;Self and super are the two reserved words provided by

These days to see the class in the inheritance will use this and super, here do a little summary, with you to communicate, there are errors please correct me ~This This is an object of its own, representing the object itself, which can be understood as: A pointer to the object itself.The usage of this can be broadly divided into 3 types in Java:1. Normal Direct referencesThis does not have to be said, this is equivalent to pointing to the current obj

These days to see the class in the inheritance will use this and super, here do a little summary, with you to communicate, there are errors please correct me ~ThisThis is an object of its own, representing the object itself, which can be understood as: A pointer to the object itself.The usage of this can be broadly divided into 3 types in Java:1. Normal Direct referencesThis does not have to be said, this is equivalent to pointing to the current obje