内置 Classloader

Class loaders load classes and resources present on their respective classpath:

• System or application class loaders load classes from the application classpath
• Extension class loaders search on the Extension classpath (JRE/lib/ext)
• Bootstrap class loader looks on the Bootstrap classpath (JRE/lib/rt.jar)

We can customize the default class loading behavior as well. We can explicitly specify the class loader while loading a class dynamically.

However, we should note that if we load the same class from different types of class loaders, these will be seen as different resources by the JVM.