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reference type Definition: the data type represented by the actual value reference of the type (similar to the pointer in C). If you assign a reference type to a variable, the variable references (or "points") the original value. Do not create any copies. Reference types include class, interface, delegate, and boxed value types. ...

catalogue 1, State retention 1. HTTP protocol 2. cookie status hold Set cookie return   Save Cookies Not saved   Saved 3. session state hold You need to set the secret key before storing the session 4. Exception handling Custom 500 Custom 404 5. Hook function Before being accessed for the first time, the hook function H ...

SMTP introduction I won't talk about too many basic concepts. Just turn to the book or Wikipedia, In short, SMTP is a simple mail transport protocol. Since it is a transport protocol, it is both sending and receiving mail It is different from POP3 and IMAP The difference can be seen simply from here working process SMTP is an application lay ...

Title: 5 Basic Java Which of the following is the language function stored in java In the bag? () java.lang java.io java.net java.util Resolution: java.lang Package contains Packaging String class Math class —— Include function Class class Object class java.util Provide tool classes including collection fr ...

  Due to the recent delay of professional courses and various things, I'm sorry for the late update, but it came today. Here is the last section of getting to know the C plate. The subsequent updates will be more specific and detailed 😋 1. Common keywords auto  break   case  char  const   continue  default  do   double else  enum   ...

  Welcome to the column [the strongest in the whole network] Python system learning manual catalogue 1, Introduction to functions 2, Parameters of function 3, Local function (nesting of functions) 4, Advanced content of functions 5, Local functions and lambda   1, Introduction to functions 1. Conce ...

Question 1: (& A) gets an array pointer such as int(*)[5]. Then + 1 skips the whole array and points to the position after 5. *(a+1)=a[1]=2;    * (ptr-1) = skip an element to point to 5 int main(){ int a[5] = { 1, 2, 3, 4, 5 }; int* ptr = (int*)(&a + 1); printf("%d,%d", *(a + 1), *(ptr - 1));   Question 2: 1. Th ...

This time, we mainly introduce various properties defined in the class, such as class properties, instance properties, private properties of the class, and various methods, such as instance methods, class methods, static methods, and   Property property method and other related knowledge. 🚀 Look at a piece of code class Tool(object): ...

Inheritance is one of the most remarkable features of object-oriented. Inheritance is to derive a new class from an existing class. The new class can absorb the data properties and behaviors of the existing class and expand new capabilities 1, Concept of inheritance That is, the subclass inherits the properties and behaviors of the parent c ...

preface In the field of multithreading, the so-called blocking will suspend the thread (i.e. blocking) in some cases. Once the conditions are met, the suspended thread will wake up automatically. Why do I need to block the queue? The advantage is that we don't need to care about when to block the thread and what to wake up the thread, be ...