Java Class Loader

Java. Lang. classloader is provided in the Java class library as the base class of the class loader.

Java Virtual Machine andProgramBoth call the loadclass method of classloader to load classes.

However, classloader is an abstract class. The real loader must be a subclass of classloader.

 

The classloader itself is also a Java class and needs to be loaded.

A bootstrap class loader is embedded in the Java virtual machine, which belongs to the kernel of the Java Virtual Machine.

Bootstrap does not require the classloader to load.

Bootstrap is responsible for loading the main classes in the Java core package. (RT. Jar)

Both extclassloader and appclassloader are in rt. jar. Extclassloader is loaded by bootstrap.

However, appclassloader is loaded by extclassloader.

The getclassloader method of these classes returns NULL. It indicates that it is loaded using Bootstrap.

Extclassloader is responsible for loading classes under the ext package

Generally, the Class Loader used by a self-compiled Java class uses appclassloader.

The delegation mode of the class loader.

When instantiating any class loader, you must create a parent-level loader for it.