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The Java compiler doesn't complain when I override a protected method with a public method. What's really happening here? Is it overriding or hiding the parent method since the parent method has lower visibility?
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Thus, when overriding protected method, the subclass can choose to override it with protected or public access modifier, but no a weaker one such as private or default.
Non-virtual or static methods cannot be overridden. The overridden base method must be virtual, abstract, or override. In addition to the modifiers that are used for method overriding, C# allows the hiding of an inherited property or method.
The problem isn't that you cannot override the protected method, it's that you are calling a protected method from outside of the class. After the class is instantiated, you can call a public method which in turn could call get_name() and you will see that the code will work as expected.
You cannot override a private or static method in Java.
A sub-class can always widen the access modifier, because it is still a valid substitution for the super-class. From the Java specification about Requirements in Overriding and Hiding:
The access modifier (§6.6) of an overriding or hiding method must provide at least as much access as the overridden or hidden method, as follows:
- If the overridden or hidden method is public, then the overriding or hiding method must be public; otherwise, a compile-time error occurs.
- If the overridden or hidden method is protected, then the overriding or hiding method must be protected or public; otherwise, a compile-time error occurs.
- If the overridden or hidden method has default (package) access, then the overriding or hiding method must not be private; otherwise, a compile-time error occurs.
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