parent class

1. After a subclass creates an instance, the class initialization method calls the initialization method of the parent class (except for Java. lang. object Class, Because Java. lang. object class does not have a parent class), and this call will be

Os:windows7 x64Jdk:jdk-8u131-windows-x64Ide:eclipse Oxygen Release (4.7.0)Code:Class Father {public int num = 1;public void SayHello () {System.out.println ("Hello");} public static void Staticfun () {System.out.println ("static Father");}} Son

Like what class Child (Parent): def __init__ (self): Parent . __init__ (self) Reply content:For your question, the answer is yes, and there is no difference. But I don't feel good enough to answer the question. To talk about super,

1. Subclasses after the instance is created, the class initialization method calls the parent class's initialization method (except for the Java.lang.Object class, because the Java.lang.Object class does not have a parent class), and the call is

Python is similar to other object-oriented languages, and each class can have one or more parent classes that inherit properties and methods from the parent class. If a method is invoked in an instance of a subclass, or if a property is accessed in

We often use inheritance in projects, but we often don't quite understand the sequence and principle of program running, especially when the transformation object is used and the parent class subclass contains static variables and methods, I don't

The Python implementation subclass calls the parent class method, and the python implementation class calls This example describes how to implement a subclass of Python to call the parent class. Share it with you for your reference. The specific

This interesting question that I stumbled upon. Observe the following code, which has a String name variable defined in both the parent class and the subclass, and whether the final inheritance is left with 1 name only or the name of the parent

Packagetest; Public classCar {Private intCarmoney;//Car Rental PrivateString Carname;//Car name Private intCarnumb;//Car Serial number Private intCarrynum;//Cargo Capacity Private intPassengernum;//number of passengers

In Java, the constructor of the parent class must be called during the subclass construction process because when there is an inheritance relationship, the Child class must inherit the content of the parent class, by what means? The answer is as

Python is similar to other object-oriented languages, and each class can have one or more parent classes that inherit properties and methods from the parent class. If a method is invoked in an instance of a subclass, or if a property is accessed in

SummaryThe basic Java object initialization process, the initialization of subclasses, and situations that can cause confusion when conversions involving parent classes and subclasses are involved.1. Basic initialization process:The initialization

In the subclass, must I access the method with parameters of the parent class ?, A subclass accesses a private member of the parent class. Abstract class Person {private int age; private String name;Public Person (intAge, String name){This. age =

Town Field Poem:Cheng listens to the Tathagata language, the world name and benefit of Dayton. Be willing to do the Tibetan apostles, the broad show is by Sanfu mention.I would like to do what I learned, to achieve a conscience blog. May all the

The example in this article describes how Python implements subclasses to invoke parent classes. Share to everyone for your reference. The implementation methods are as follows: Python is similar to other object-oriented languages, and each class

This article mainly introduces the constructor and overwriting methods for php to implement parent to call the parent class. Based on the previous article about using class inheritance to solve code duplication problems, it further analyzes the

InProgramThis is often used in a function of the parent class. We know that this points to the current object. The specific point is the currently running object, if there is a virtual function in the parent class, this call method may be a virtual

Constructor is used to initialize the Class Object. Unlike other members of the parent class, it cannot inherit from the quilt class (subclass can inherit all member variables and member methods of the parent class, but does not inherit the

Member variables:First look at this piece of code:The parent class. Class Fu{int num = 3;} Class Zi extends Fu{int num = 4;void Show () {System.out.println ("num =" +this.num);}} Class Extendsdemo {public static void main (string[] args) {Zi z = new

In Java, in the construction of a subclass, the constructor of its parent class must be called, because the subclass inherits the contents of the parent class and does so by what means. The answer is as follows: When you new a subclass object,