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.
Can we change the visibility of method while overriding?
First, when you override methods in a subclass, the overriding method must be at least as visible as the overridden method. While it is possible to take a private method and override it with a public method in a subclass, the reverse is not possible; you can't override a public method with a private method.
How do you prevent a field or a method of any class from inheriting to sub classes?
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.
Which methods Cannot be overridden?
A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance's superclass can override any superclass method that is not declared private or final.