C# : .NET
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[["[(CBCESTUUUUTTUUUUYF6476466466F+CCCE(CIBXCSTTUUUUTTUUUU","rhdwsfldtr.","Override"," affects virtual method usage. Virtual methods are meant to be re-implemented in derived classes. The override keyword specifies that a method replaces its virtual base method.","This program"," illustrates the difference between an override method in a derived class, and a method that is not an override method. It does nothing useful but helps us learn about override methods. ","Here: ","In the example, the class A is the base class. It has the virtual method Y.","Virtual ","virtual","And: ","In class B, we override Y. In class C, we implement Y but do not specify that it overrides the base method.","Class ","class","ins","class","adsbygoogle","data-ad-client","ca-pub-4712093147740724","data-ad-slot","6227126509","data-ad-format","auto","br","ins","class","adsbygoogle","data-ad-client","ca-pub-4712093147740724","data-ad-slot","6227126509","data-ad-format","auto","Based on:"," .NET 4.6\n\n","C# program that uses override modifier","\n\nusing System;\n\nclass A\n{\n public virtual void Y()\n {","\n // Used when C is referenced through A.\n ","Console.WriteLine(","\"A.Y\"",");\n }\n}\n\nclass B : A\n{\n public ","override"," void Y()\n {","\n // Used when B is referenced through A.\n ","Console.WriteLine(","\"B.Y\"",");\n }\n}\n\nclass C : A\n{\n public void Y()"," // Can be \"new public void Y()\"\n ","{","\n // Not used when C is referenced through A.\n ","Console.WriteLine(","\"C.Y\"",");\n }\n}\n\nclass Program\n{\n static void Main()\n {","\n // Reference B through A.\n ","A ab = new B();\n ab.Y();","\n\n // Reference C through A.\n ","A ac = new C();\n ac.Y();\n }\n}\n\n","Output","\n\nB.Y\nA.Y","In this example,"," the A type is used to reference the B and C types. When the A type references a B instance, the Y override from B is used. But when the A type references a C instance, the Y method from the base class A is used. ","Note: ","The override modifier was not used. The C.Y method is local to the C type.","Warning: ","In the above program, the C type generates a warning because C.Y hides A.Y. Your program is confusing and could be fixed.","Tip: ","If you want C.Y to really \"hide\" A.Y, you can use the new modifier, as in \"new public void Y()\" in the declaration.","New ","new","Research."," The C# specification helps us understand override methods. With override, we specialize an \"existing inherited virtual method.\" We provide a new implementation for it. This is at first confusing. ","Tip: ","I recommend writing a test program to see how this works. This may help you understand.","Whereas a virtual method introduces a new method, an override method specializes an existing inherited virtual method by providing a new implementation of that method.","The C# Programming Language: google.com ","https://books.google.com/books?id=s-IH_x6ytuQC","Summary."," The override modifier is needed for implementing polymorphic behaviors in derived classes. You can re-implement a virtual base method. This causes the base implementation to be ignored in favor of the \"override\" method. ","And: ","This polymorphic behavior is core to object-oriented design in many programs.","br","ins","class","adsbygoogle","data-ad-client","ca-pub-4712093147740724","data-ad-slot","3679700504","data-ad-format","link","br","ins","class","adsbygoogle","data-ad-client","ca-pub-4712093147740724","data-ad-slot","6227126509","data-ad-format","auto"],"url(data:image/png;base64,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)","url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAG4AAACCAgMAAADasxWRAAAADFBMVEX/6Nn///+VlZX29va5ksB5AAAASElEQVR4AWPACZj/f0DmjkqOSjKtQgcLyJccZiEE9SOmP8mXHEaBMBoIo4EwGggryJccvvVKKAogTnJUclRyVHLklgmjkqOSAALWyrsxEHLDAAAAAElFTkSuQmCC)","url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIwAAAB4BAMAAADS7QcCAAAAGFBMVEX///95cvSaspm/zr6ppPiuqvilofiMhfa6xS0cAAAAfUlEQVR42u3XsQmAMBgF4V9xAAOCfVxAdAEdQtwg1il0fsHS8IpIsLob4OvPnKy1V7WXWR9ER8oMs8hbZ6ImZUYTTTAwMDAwMDAwMDAwMDAfmX4T7Tl3V+o1iYieKifLYs5NFLOYxUQrDAwMDAwMDAwMDAwMzA/MFUSx0GveDtlxrtujxRkAAAAASUVORK5CYII=)"]

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