Found a total of 10000 related content
What is class loading in Java?
Article Introduction：Java's class loading is a mechanism for JVM to load classes dynamically at runtime. Its core works by three class loaders at hierarchy and delegate model. 1. BootstrapClassLoader is responsible for loading the core class library; 2. ExtensionClassLoader is used to load the extension library; 3. ApplicationClassLoader loads classes in the application classpath. Class loading adopts on-demand loading strategies, which helps reduce memory overhead and improve startup efficiency. It is particularly critical in large applications (such as Spring, OSGi), web servers and plug-in systems, and can realize dynamic loading and isolation of classes. If the configuration is not correct, ClassNotFoundEx may be triggered
2025-06-30
comment 0
638
What is the class loading delegation model?
Article Introduction：Java's class loading delegate model is a hierarchical structure mechanism that ensures that classes are loaded by the most trusted class loader. 1. BootstrapClassLoader loads core Java classes (such as java.lang, java.util); 2. ExtensionClassLoader is responsible for loading classes in the extension directory and delegating BootstrapClassLoader; 3. ApplicationClassLoader loads classes in the application classpath and delegates ExtensionClassLoader. When the class needs to be loaded, the request starts from the ApplicationClassLoader and goes up step by step
2025-06-29
comment 0
416
How does Java class loading work (Bootstrap, Extension, System ClassLoaders)?
Article Introduction：Java's class loading mechanism is composed of Bootstrap, Extension and SystemClassLoaders, and uses a parent delegation model to ensure the security and unique loading of classes. BootstrapClassLoader is responsible for loading core class libraries such as rt.jar; ExtensionClassLoader loads extension libraries such as jar under jre/lib/ext; SystemClassLoader loads classes on the application classpath. When the class is loaded, the parent loader is given priority to find the class. If none of them are found, a ClassNotFoundException will be thrown. Understanding this mechanism can help troubleshoot conflicts, avoid security risks and improve
2025-07-12
comment 0
478
How to implement automatic loading of classes in PHP?
Article Introduction：In PHP, automatically loading classes are implemented through the __autoload or spl_autoload_register function. 1. The __autoload function has been abandoned, 2. The spl_autoload_register function is more flexible, supports multiple automatic loading functions, and can handle namespace and performance optimization.
2025-05-15
comment 0
494
How to Access Child Class Methods from a Parent Class in PHP?
Article Introduction：PHP: Accessing Child Class Methods from a Parent ClassOften, when working with inheritance in PHP, developers encounter the need to access functions from a child class within the parent class. This can be achieved through a powerful mechanism: abstra
2024-10-19
comment 0
373
How Can I Get a Class Name in PHP?
Article Introduction：Getting Class Name in PHPSimilar to Java, PHP provides various methods to retrieve the class name.Using ClassName::classWith PHP version 5.5 and above, class name resolution can be achieved using the ClassName::class syntax:namespace Name\Space;
cla
2024-10-19
comment 0
977
