C# vs Java: casting objects and calling members
February 11th, 2011
Given these two functionally identical code samples in c# and java, what is the output?
C#:
public class A
{
public String Method()
{
return "this is A";
}
}
public class B : A
{
public String Method()
{
return "this is B";
}
}
A thisA = new B();
thisA.Method();Java:
public class A
{
public String Method()
{
return "this is A";
}
}
public class B extends A
{
public String Method()
{
return "this is B";
}
}
A thisA = new B();
thisA.Method();What does thisA.Method() return?
It turns out that there are two different answers to this. In .NET/C# it returns from A (“this is A”). In Java, it returns from B (“this is B”).
So far it appears that this is a type issue; new B() must be getting cast back to A in C#. Looking for some documentation on this specifically. Links anyone?