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Network programming tutorial
  • What is the long connection in php?

    What is the long connection in php?

    Introduction to PHP long connection: 1. Long connection means that after establishing a SOCKET connection, the connection will be maintained regardless of whether it is used or not, but the security is poor. 2. Long connections can save more TCP establish
    2022-05-21
  • The difference between TCP and UDP in php

    The difference between TCP and UDP in php

    The difference between TCP and UDP in php: 1. TCP is connection-oriented, while UDP is connectionless. 2. TCP is used when reliable transmission is necessary at the transport layer. UDP is mainly used for communications or broadcast communications that ha
    2022-05-21
  • How does php reference counting implement garbage collection?

    How does php reference counting implement garbage collection?

    PHP reference counting implements garbage collection: 1. Add a reference counter to the object, and the value of the reference counter will increase every time somewhere. Whenever a reference becomes invalid, the counter is decremented by one. 2. The garb
    2022-05-21
  • Exploring the limitations of java generics

    Exploring the limitations of java generics

    Exploring the limitations of java generics: 1. Type variables in the static context of generic classes are invalid. 2. Type variables cannot be instantiated. 3. Generic parameters cannot be instantiated with basic types. 4. Arrays of parameterized types c
    2022-05-21
  • Introduction to java local variable table

    Introduction to java local variable table

    Introduction to java local variable table: 1. The local variable table is also called a local variable array or local variable table. Defined as an array, it is mainly used to store method parameters and define local variables in the method. 2. Because th
    2022-05-21
  • How to use java dynamic proxy

    How to use java dynamic proxy

    The use of java dynamic proxy: 1. When using dynamic proxy, you need to define an intermediary class between the proxy class and the delegate class. 2. In dynamic proxy mode, the delegate class must implement a certain interface.
    2022-05-20
  • Comparison of java dynamic and static languages

    Comparison of java dynamic and static languages

    Comparison of java dynamic and static languages: 1. Dynamic language, a language whose structure can be changed during operation, such as JavaScript, PHP, and Python. 2. Corresponding to dynamic languages, languages ​​whose structure does not change durin
    2022-05-20
  • Introduction to JDK annotations in java

    Introduction to JDK annotations in java

    Introduction to JDK annotations in java: 1. @Override: used for methods, indicating that the method overrides the parent class method. 2. @Deprecated: Indicates that the method has expired and is not recommended for developers to use. 3. @FunctionalInterf
    2022-05-20
  • What is Zval in PHP

    What is Zval in PHP

    2022-05-20
  • What are the characteristics of hash table in PHP?

    What are the characteristics of hash table in PHP?

    2022-05-20
  • Two storage methods for java object headers

    Two storage methods for java object headers

    There are two types of storage of Java object headers: 1. The object header is mainly used to store two pieces of information, storing the data and type pointers of the object itself; 2. The data of the object itself when running mainly includes hash code
    2022-05-19
  • Points to note when using static in java

    Points to note when using static in java

    Notes on using static in Java: 1. Only properties and methods declared statically can be accessed, while properties and methods declared non-static cannot be accessed; 2. Parent class references can only adjust parent class and subclass overriding methods
    2022-05-19
  • What is the method of Java thread scheduling?

    What is the method of Java thread scheduling?

    The methods of Java thread scheduling are: 1. Collaborative thread scheduling. Multi-threaded systems adopt collaborative scheduling, and the execution time of the thread is controlled by the thread itself. 2. Preemptive thread scheduling. Using a preempt
    2022-05-19
  • How to implement JDBC authentication login in java

    How to implement JDBC authentication login in java

    Java's JDBC implements verified login: 1. Connect to the database; 2. Obtain the request object stmt; 3. Create a keyboard object and obtain the user name and password; 4. Write SQL statements; 5. Execute the query; 6. Determine whether the login is s
    2022-05-19
  • Matching of Lambda expressions in Java interfaces

    Matching of Lambda expressions in Java interfaces

    Matching of Lambda expressions in Java interfaces: 1. Each lambda can match a given type through a specific interface; 2. Any interface that contains only one abstract method can be used to make lambda expressions.
    2022-05-19
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