What access modifiers exist in Java?

In Java, there are four access modifiers:

1. public: The element (class, field, method, constructor) is accessible from any other class in any package.
2. protected: The element is accessible within its own class, in subclasses (in the same or different package), and in classes from the same package.
3. Default (package-private): The element is accessible only within its own class and in classes from the same package.
4. private: The element is accessible only within its own class.

Summary table of accessibility:

Modifier	Access within class	Access within package	Access in subclass (different package)	Access from any class (different package)
private	Yes	No	No	No
default	Yes	Yes	No	No
protected	Yes	Yes	Yes	No
public	Yes	Yes	Yes	Yes