What is the purpose of using the package-private access modifier in Java?

The package-private access modifier (absence of an explicit modifier) in Java restricts the visibility of a class, method, or field to within the current package. This means that elements with this level of access are accessible to all classes in the same package but not from other packages.

Purpose of using package-private:

• Package-level encapsulation: allows grouping related classes and providing them access to internal details without exposing them to the outside world.
• Implementation hiding: implementation details are hidden from other parts of the application, simplifying maintenance and reducing coupling.
• Simplified testing: classes and methods can be made accessible for tests within the same package without needing to make them public.

Example:

class Helper {
    void doWork() {
        // accessible only within the package
    }
}

Here, the class Helper and the method doWork are accessible only within the package, which limits their usage and protects against incorrect external use.