Can we reduce the visibility of the inherited method?
You cannot reduce the visibility of a inherited method. Here parent class has func() method which is public and overridden by the subclass TestClass which is private. Now the compiler throws the error that I cannot the reduce the visibility.
Which methods Cannot be inherited?
You can prevent a class from being subclassed by using the final keyword in the class's declaration. Similarly, you can prevent a method from being overridden by subclasses by declaring it as a final method.
How do you prevent a field or a method of any class from inheriting to sub classes?
To prevent inheritance, use the keyword "final" when creating the class. The designers of the String class realized that it was not a candidate for inheritance and have prevented it from being extended.