How do access modifiers internally work in JVM?

The Java Virtual Machine Specification covers this in detail. In particular section 2.7.4 Qualified Names and Access Control states.

The Java Virtual Machine Specification covers this in detail. In particular, section 2.7.4 Qualified Names and Access Control states: A field, method, or constructor of a class may be declared using at most one of the public, private, or protected keywords. A public member may be accessed by any class or interface.

A private member may be accessed only from within the class that contains its declaration. A member that is not declared public, protected, or private is said to have default access and may be accessed from, and only from, anywhere in the package in which it is declared.

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