What is Bootstrap, Extension and System Class loader in Java?

What is Bootstrap, Extension and System Class loader in Java?

The Bootstrap class loader loads key Java classes. Bootstrap class loader loads the basic classes from Java library, like java.*, javax.*. This is the root in the class loader hierarchy.

The Extension class loader loads the classes from the JRE’s extension directories, such lib/ext directories

The System class loader loads the classes from the system class path, which are set by the CLASSPATH environment variable.
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