super applock

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

public class Father {protected String name;int age;Father () {System.out.println ("Father non-parametric constructor");}Father (String name) {SYSTEM.OUT.PRINTLN ("parameter constructor for person");}Public, private, protected, subclass can inherit the public, protectedThe default is to be private, not inherited,Java does not support multiple inheritance, C + + support,Extends: extension, not the meaning of inheritancevoid jump (int lenth) {System.out.println ("lenth =" +lenth);}protected void Ju

WP Super Cache is a good WordPress optimization plugin, is the best I have used a cache plugin. Open the wordpress background Search Plugin page, the first is the plugin, it is conceivable that his status is much more powerful.What is WP Super Cache? WP Super cache generates static HTML files from your dynamic WordPress blog. When an HTML file is generated, your

Turn on super power mode? (G5500) Save battery power by using a minimal layout of the home screen and limiting the number of applications available in Super Save mode. To turn on this feature, follow these steps:1. Under the Standby page, click "Application".2. Click "Set".3. Slide up the screen and click on "Battery".4. Click on "Super Power saving Mode".5. Cli

Server The super-Yi customization Server includes a series and I series, the A series is a server based on the AMD series processor, and the I series is a server based on the Intel family of processors. Our evaluation is the use of dual AMD Opertron processor 220A-2806T Server, it is located in the enterprise-class core overload dedicated server, small and medium-sized storage multi-function server, Internet E-commerce Network operation of the core se

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

Super QQ Commemorative version of the icon lit Web site: http://mq.qq.com/pages/sqq2vip/light_icon.jsp Super QQ Commemorative edition icon lighting rules 1. Successful participation in the "Super QQ upgrade QQ member/Super member" users, can be lit on this page Super QQ c

Ultra-polar is currently a high degree of concern on the market products. The appearance of the extremely thin, so that the ultra-polar at the first glance and the ordinary notebook has a distinct difference. According to Intel's definition, a 13-inch pole should be under 18mm, 14 inches above the large-screen super-pole can be widened to 21mm thickness. The reduction of the thickness will also bring the weight of the whole machine down. For a friend

Hero Super Jie Ba the potential of the big play Super Jie Ba can be said to be the originator of the Hing, so it has a lot of user groups. However, the development of Super Jie Ba is now no longer a Hing player, and becomes a practical multimedia toolkit. Hero Super Jie Ba current version of the V9.4 version. Here we

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