Refresher/csharp/Accessibility Modifiers

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Class inheritance: colon + base class Private class-level variables: inherited but not accessible Value: keyword for implicit input name of the set method in object classes Protected class-level variables: available to classes in the same namespace Protected internal: available to derived classes, and classes within the same Assembly, and the base class Default constructor: disappears when any constructor is written System.Object: top .NET class that everything is derived from Method overriding: changing the method behavior for a derived class Method overloading: using the same method name again in the same class but with different number, type and order of

parameters Virtual method: can be over-ridden but cannot change method signature Method signature: its name and the number and type of its parameters, where the last parameter may comprise of an array

of values Sealed class (in Java, final class): cannot be inherited Sealed method: method cannot be inherited but class can when not sealed Abstract class (in C++, pure virtual method): blueprint for a class without any implementation and thus cannot be

instantiated Abstract class methods: not all must be abstract, some can be concrete Abstract class required when at least one of the methods in the class is abstract Abstract method: require non-abstract derived classes to provide their own implementation of this method '''Interface class? an abstract class with public abstract methods all of which must be implemented in the inherited classes''' Interface class methods: all must be abstract and public and thus accessibility modifiers not needed Multiple interfaces: can be inherited Namespace class: classes are declared inside a namespace

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