parent constructor

  Question 1: The execution result of the following code: class Person{ String name = "No name"; public Person(String nm){name = nm;} } class Employee extends Person{ String empID = "0000"; public Employee(String id){empID = id;} }

From http://www.cnblogs.com/ggjucheng/archive/2012/11/26/2789722.html Access members of the parent class If you overwrite the methods of the parent class, you can use super to call the methods covered by the parent class, you can also use super

Java static code block usage I. Differences between Java static code blocks and static methodsGenerally, if some code must be executed when the project is started, a static code block is required. This code is actively executed and needs to be

The first time I went to sleep, I found a lot of problems, and I couldn't understand anything. I went to bed at night and found that it was like this. After a few days, I found that my handwriting was still based on my memory, so next time, next

Today we are going to talk about inheritance, to be honest today is also my first contact.What is the concept of inheritance? Is that a class can inherit properties and methods (members) of another classInheritance is a very important feature in

1. Inheritance: Inheritance is a class that can use properties and methods (members) of another class2. Subclass inherits the symbol used by the parent class as ":" (colon)3. Subclasses can inherit private members of the parent class, but cannot be

OriginHow to Use Cocos2d-x to quickly develop the game, the method is very simple, you can look at its own routines, or from the online search tutorial, run the first HelloWorld, and then write the relevant logic code in HelloWorld, add layers,

I. Copy inheritance: Universal type when new or no new is availableCopy inheritance:Property by The parent constructor . Call (This) to inherit the property. The prototype method is passed to the child prototype as a property of a parent in terms of

1. Construction of sub-class objects(1) A constructor can be defined in a subclass(2) Subclass constructor, must initialize the inherited member , there are two ways① is initialized directly by initializing the list or by assigning a value.②

1. Run the Textinherists.java example, observe the output, pay attention to the call relationship of the constructor method between the parent class and the subclass, modify the code of the parent constructor method, and explicitly call grandparent

1. A class is an abstraction of an object, and the class also encapsulates the object. The so-called encapsulation is that the designer of the class simply provides the user with the parts that the class object can access, while the other hidden

Construction Method 1. The private modified constructor does not inherit from the quilt class. 2. when defining a class, there is a default parameterless constructor if no definition constructor is displayed, and if defined, no longer has a

Http://docs.kissyui.com/5.0/guides/base/oo.htmlJavaScript is a self-contained system that has a set of code reuse patterns that can be used to find a theoretical basis in JavaScript design patterns and JavaScript programming patterns. Kissy is the

Recently in the study thinkphp framework, see _initialize () function, also just do a small summary A simple look at Google, Baidu on the tutorial, feel the crackling said a lot, all in the test, did not mention the idea ~ Experimental version:

The reason the constructor cannot be declared as a virtual function: 1, the so-called virtual function is a polymorphic case only executes one, and from the concept of inheritance, always first constructs the parent class object, then can make the

(1) Access to base class membersAccess the members of the base class through the base keyword:Calls a method on the base class that has been overridden by another method.Specifies the base class constructor that should be called when creating an

Let's start by explaining what smart pointers are.A smart pointer is a RAII (the initialization of a pointer that executes a resource in the object's constructor) and is released in a destructor (delete pointer): This technique calls it RAII

The coordinate parameter of a dialog box shows an introductionThis is to get the length and width of the dialog, coordinates of each point, relative coordinates, relative coordinates of the parent window, relative to the coordinates of the

A problem encountered in the statistical system was finally solved, but it was still difficult for me to debug it for so long. The execution sequence of events that inherit forms and controls is generally a queue. First come, first registered

PHP Convert text file to CSV output PHP Convert text file to CSV outputThis class provides a quick and easy way to convert a CSV file into a fixed width. It can use Splfileobject to perform iterations, making it very efficient for an iteration to