Technology lies in communication, communication, reproduced please specify the source and maintain the integrity of the work.The 1.pointer-like class is designed as a pointer and can be used as a pointer with two commonly used operators (* and-), so we have to overload both operations /*simple implementation of the * and-operator of the smart pointer*/Template classT>classshared_ptr_test { Public: Toperator* ()Const //Reload * { return*px; } T*operator()Const //Heavy-duty
a class, the class class where the inner class resides is called an external class. A Features of the Inner class:
Stand-alone class file
also need to compile
can also produce objects
B Static Inner class:Definition method: Class outer{Static Class inner{Static inner classes cannot access external members unless the external member is also a static member}}Static inner classes Create
Python's class allows you to define many custom methods that make it very easy to generate specific classes. The following are the common custom methods of centralization:How can you print it well? Just define a good __str__() method and return a nice-looking string:__str__()>>> class Student(object):... def __init__(self, name):... self.name = name... def __str__(self):... return ‘Student object (name: %s)‘ % self.name...>>> print(Student(‘Michael‘))
value of the property or a reference to the function (method).note that in the __getattribute__ method it is a bad behavior to use a similar self.***, because each invocation of the class's properties forces the call to __getattribute__. Therefore, it is very possible to cause recursive calls.classtest:def __getattribute__ (Self, item):ifitem = ='a': Print ('------%s------'%Item)return '%s is get'%ItemElse: returnSelf.test # '.........') T=Test () print (t.b)>>>recursionerror:maximum
J2SE quick advanced -- four basic abstract classes of IO stream: InputStream, OutputStream, Reader, Writer, and abstract class
The above section briefly describes the four abstract classes in the java. io package and Their Relationships. Here we will further summarize them and their subclasses.
At the end of the previous blog, I posted the entire IO family in Ja
this attribute refers to the type of the interface, and the type information of the implementing class is stored by the Implementationtype attribute. If there is no interface, only the type is defined directly, then this type of information is stored on the ServiceType property, and the Implementationtype property is not used.In the above examples, servicetype is Iplaygame interface related information, Implementationtype is the Nbplaygame class information. If, as in the case of the DoSomethin
Java inheritance, knowledge points of Advanced Concepts of classes, and java knowledge points
1.Inheritance
In object-oriented programming, you can create a new class by extending an existing class and inheriting its attributes and behaviors. This method is called inheritance ).
2.Benefits
A. code reusability
B. Subclass can extend attributes and methods of the parent class.
C. attributes and methods of the
: This article mainly introduces mobile app interface programming technology-PHP advanced classes and objects for learning and implementation. For more information about PHP tutorials, see.
Create classes and objects
Name ;}}$ car = new Car (); echo $ car-> name .''; Echo $ car-> getName ();
Class attributes
Attribute declaration starts with the keyword
The advanced concepts of the class include access modifiers, encapsulation, static members, initialization blocks, and mixed content such as inner classes.Access modifiers:(1). Open access level: Use the public keyword modifier. Members that are decorated with the public keyword are exposed externally, that is, public members can be accessed by any other object.(2). Protected Access level: Use the protected keyword modifier. Protected members can be a
Reading directory
I. Attributes
Ii. Custom Attributes BookAttribute instances
.The attribute is implemented by the attribute class. In the previous article "C # Learn from the newest and learn from others. NET Framework advanced features -. the properties provided by the NET Framework (II). We are talking about the same Obsolete. We can also customize the attribute class. The Attribute Class is composed of System. derived from Attribute
.For conve
typeerror:attempted to reuse key: ' A 'The value of a member is allowed to be duplicated, but is also the first member property when accessed, and Python considers the second member of the duplicate as the first alias from Import Enum class Book (Enum): = 1 = 1>>>book.abook.b #访问b也变成了打印a属性, B is treated as an alias of aIf the restriction enumeration is not duplicated, a unique module is introduced, and the unique is a class adorner, which is used to constrain the value from Import Enum,
For the inheritance of classes in javascript, refer to Ruan Yifeng's Blog "design idea of Javascript Inheritance Mechanism.
I. Problems Encountered in javascript instantiation:
The following describes how to use the example in javascript advanced programming. If a car Object is defined, it is an instance of the Object class. As shown below:Copy codeThe Code is as follows:Var oCar = new Object ();OCar. color
,parallel.foreachThe Parallel.ForEach () method traversal implements the collection of IEnumerable, which is similar to a ForEach statement but traverses asynchronously. There is also no definite traversal order here. string[] data = {"Zero"," One"," Both","three"," Four","Five","Six","Seven","Eight","Nine","Ten"}; Parallelloopresult result= parallel.foreachstring> (data, S ={Console.WriteLine (s); Thread.Sleep (Ten); });Execution Result:ZerofivetenonesixthreetwosevenfoureightnineThis
~128, the data is fetched directly from the buffer pool.4:character (Learn)(1) Character Construction methodNew Character (' a ');(2) The method to be mastered:
Determines whether the given character is uppercase
Determines whether the given character is lowercase
Determines whether a given character is a numeric character
Turn a given character into uppercase
Turn a given character into lowercase
(3) Case:Number of occurrences of uppercase, lowercase, and numeric c
because, as opposed to the global option to define a regex expression with regexoptions at new regex, Inline flags can define matching options in smaller granularity (in groups), making it easier to express our thought syntax like this: (I:expression) to define an option, (?-i:expression) to delete an option, (? i-s:expression) define I, delete s, yes, we can define a number of options at once. So, with the inline option, you can define a group in a regex to be of the same size, and a group tha
, create a class named Studentdal that defines a method in this class Loadstudentinfo () returns a value type ListMethod of invoking Dal at the BLL layerGets the generic collection returned to the BLL after the UI layerTo use generics as a data source for DGVpublic class Studentextends:student { //One is the account name public string Subjectname {get; set;} Test time public DateTime examdate {get; set;} Result public int Studentresult {get; set;} } Pub
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