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Course Introduction：Java17 is a long-term supported version that brings safer, concise and efficient code improvements. 1. Use sealed class to control the inheritance of the class, explicitly allowable subclasses through permits, and require the subclass to be marked as final, sealed or non-sealed; 2. Switch pattern matching becomes the standard, supporting directly declaring variables and type matching in the case, and combining sealed class to achieve exhaustive inspection; 3. Record class provides concise immutable data carrier syntax, automatically generates constructors, getters, equals, hashCode and toString, supporting custom methods and compact constructor verification; 4.instanceof

2025-08-06 comment 0  505

Course Introduction：Autoloading in PHP: Concept and Implementation Autoloading is a mechanism in PHP that automatically loads classes when they are needed, without requiring an explicit include or require statement for each class file. It helps streamline code org

2025-01-01 comment 0  710

Course Introduction：The destructor in C is a special member function that is automatically called when an object is out of scope or is explicitly deleted. Its main purpose is to clean up resources that an object may acquire during its life cycle, such as memory, file handles, or network connections. The destructor is automatically called in the following cases: when a local variable leaves scope, when a delete is called on the pointer, and when an external object containing the object is destructed. When defining the destructor, you need to add ~ before the class name, and there are no parameters and return values. If undefined, the compiler generates a default destructor, but does not handle dynamic memory releases. Notes include: Each class can only have one destructor and does not support overloading; it is recommended to set the destructor of the inherited class to virtual; the destructor of the derived class will be executed first and then automatically called.

2025-07-19 comment 0  450

Course Introduction：spl_autoload_register() is a core function used in PHP to implement automatic class loading. It allows developers to define one or more callback functions. When a program tries to use undefined classes, PHP will automatically call these functions to load the corresponding class file. Its main function is to avoid manually introducing class files and improve code organization and maintainability. Use method is to define a function that receives the class name as a parameter, and register the function through spl_autoload_register(), such as functionmyAutoloader($class){require_once'classes/'.$class.'.php';}spl_

2025-06-09 comment 0  413

Course Introduction：This article details how to ensure that the drop-down menu can automatically retain its previously selected values when PHP dynamically generates HTML drop-down menus. By modifying the PHP function to receive and compare the submitted selected values with each option value in the database, adding selected attributes to the matching options significantly improves the user experience and avoids the trouble of data loss and repeated selections.

2025-08-20 comment 0  980

Course Elementary  13880

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82435

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13230

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24687

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27533

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.