【转载】#473 - Access Interface Members through an Interface Variable
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Onece a class implementation a particular interface, you can interact with the members of the interface through any instance of that class.
1 Cow bossie = new Cow("Bossie", 5);
23// Cow implements IMoo, which includes Moo method4 bossie.Moo();
You can also declare a variable whose type is an interface, assign it to an instance of any class that implements that interface and then interact with members of the interface through that interface variable.
1
//
bossie is a Cow, which implements IMoo, so we can point IMoo variable at her
2 IMoo mooer = bossie;
3 mooer.Moo();
Notice that we can‘t access members of Cow that aren‘t part of IMoo using this interface variable.
1
//
Can‘t call Cow methods not in IMoo
2 mooer.MakeSomeMilk();
Even though MakeSomeMilk is a public method in the Cow class, we can‘t access it via IMoo.
原文地址： #437 – Access Interface Members through an Interface Variable
原文：http://www.cnblogs.com/yuthreestone/p/3596316.html
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