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Using interfaces in C#
Simple example with interfaces. This example just shows, that when we have interface (method's signatures, delegates etc.) we don't care, how this interface is implemented.
We have interface and class:
interface IList
{
void Add(object o);
void Remove(object o);
void Print();
}
class Implementation : IList
{
private ArrayList arrayList = new ArrayList();
public void Add(object o)
{
arrayList.Add(o);
}
public void Remove(object o)
{
arrayList.Remove(o);
}
public void Print()
{
foreach (string line in arrayList)
Console.WriteLine(line);
}
}
Somewhere in the code we have methods:
void Foo(IList list)
{
list.Add("I");
list.Add("am");
list.Add("using");
list.Add("interfaces");
}
void Foo2(IList list)
{
list.Print();
}
And we call them:
IList list = new Implementation();
Foo(list);
Foo2(list);
Try to guess, what is the output? ;)
Yep ;)
I
am
using
interfaces
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