Maybe we seldom use this piece of knowledge in our daily work, but I still like to find out the unknown knowledge.
class method rewrite rules for PHP
1. The final modified class method cannot be overridden by a quilt class
The final decorated class
For this lesson, let's take a look at the concept and usage of the final keyword.
What is the final keyword?
Final Chinese translates as "ultimate", "final". The final keyword modification before declaring a class means that the function will not
This article describes the differences between public, private, and protected in phpclass and detailed analysis of instances. For more information, see
I. differences between public, private, and protectedPublic: The permission is the largest, and
I am confused with public, private, protected, and this and self. I have already written a blog post about public, private, and protected. The following describes how to use this, self, and parent.
1, this
1. to use this, you must be in a situation
PHP coding specifications. PHP coding specification 1. File Format 1. for files that only contain php code, we will ignore it at the end of the file ?. This is to prevent extra spaces or other characters from affecting the code specification of the
The __get () method, which is explained in the official manual, is called when a class property or method that is not defined or is not visible in the current environment is invoked (by adding: or Setting | assignment). these undefined or invisible
Maybe we seldom use this piece of knowledge in our daily work, but I still like to find out the unknown knowledge.class method rewrite rules for PHP1. The final modified class method cannot be overridden by a quilt classThe final decorated class
Method areaInside a JVM instance, type information is stored in a memory logical area called the method area. Type information is extracted from the class file by the ClassLoader when the class is loaded. Class (Static) variables are also stored in
Reflection calls Private method Practices (PHP, Java),
There is a universal problem in the single measurement, which cannot be called directly by the private method in the side class. Small drag in the process through reflection to change the
* access rights----------------member variables* Public Private protected default* Current Package The same class can be used to** Other classes within the current package may not be able to** Other classes in the bag can not be no no no** the class
Three Access Permissions
Public: can be accessed by any entity
Protected: only access to child classes and member functions of this class is allowed.
PRIVATE: only access to member functions of this class is allowed.
Three inheritance
signal and slot as the core mechanism of QT is widely used in QT programming, this paper introduces some basic concepts of signal and slot, meta-object tools and some problems that should be paid attention to in the process of actual use.
QT is
Example one:
Copy CodeThe code is as follows:
Definition of Class
Class User
{
attribute, note the scope of public, private, protected
Public $name = "Hackbaby";
constructor function
function __construct ()
{
echo "Construct
";
}
Method
function
Work by day-the first blog day&happy days, work first Blogday
Today (Monday) see a colleague's life plan, feel quite suitable for me, practice, on Theo&tools day+code Day+blog Day, intermittent have happy day ~
Blog day to do so, a blog summary,
Recommendation 49: A protected virtual method should be extracted in Dispose modeIn the standard dispose mode, the Dispose method of the real IDisposable interface does not do the actual cleanup work, it actually calls the following virtual method
1, to finalize the understanding:The finalize- method name. is part of the operating mechanism of the GC operation, and the Finalize method is called when the GC operation is performed. Java technology allows use Finalize () method to do the
Static Data Member
When the data member declaration in the class is static, all instances of the class share the same Member, which is similar to the static variables in C functions. Static Data Generation
The Member is allocated to a fixed memory
Partial is a class modifier used to split the class definition into several parts for easy code management, suchClass classa{Void (){;}Void B (){;}}AndPartial class classa{Void (){;}}Partial class classa{Void B (){;}}Is the same
The details are as
Http://blog.chinaunix.net/u1/41167/showart_1084013.html
The original post is as follows:1 # include
2 using namespace STD;
3
4 Class {
5 public:
6 A (int I _, Int J _)
7 {
8 I = I _;
9 J = J _;
10}
11 void disp (A &)
12 {
13 cout 14}
15
16
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