Using derived obj as a parameter in one of the methods

Hi
I have a class "class1", which is the parent class. Another class "class2" is derived from class1 (extends class1)
In class3, there is a method "method3" that uses "class1" obj as a parameter.
I need to call the same method "method3" in class2 also, by passing "class2" obj as a parameter.
Is there a way that I can do this.
Any help is greatly appreciated.

If the method takes a "class1" type as an argument, then you can pass it anything which is of type "class1" or extends from it. So yes you can pass that same method a "class2" type.

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Using derived obj as a parameter in one of the methods

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