How do you uninstall a class in JVM?

In the JVM, class unloading is performed by the garbage collector. When a class is no longer referenced by any objects, the garbage collector will mark the class as unloadable and unload it at the appropriate time.

Specifically, when a class is loaded into the JVM, it is loaded by the loader into the method area (Metaspace) and a Class object is generated to represent that class. When this Class object is no longer referenced, the JVM marks it as “unloadingable”. When the garbage collector performs garbage collection, it checks if the loaded classes and their corresponding Class objects are referenced, and if they are not referenced, the class can be unloaded.

It should be noted that not all classes can be unloaded. Some special classes, such as those loaded by the system class loader, by the bootstrap class loader, and those marked as “permanent generation” (before Java 8) or “metaspace” (Java 8 and later), may not be able to be unloaded.