本文介绍了如何停止将派生类对象分配给基类指针的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有四个课程如下
class Base
{
public void printf()
{
Console.WriteLine( 我来自基地!!!);
}
}
class DerivedA:Base
{
public void printf()
{
Console.WriteLine( 我来自A !!!);
}
}
类 DerivedB:基本
{
public void printf()
{
Console.WriteLine( 我来自B !!!);
}
}
class testProgram
{
public void print(Base baseClass)
{
baseClass.printf();
}
}
我的目标是当我在第4行执行以下代码时,它必须给我错误。
testProgram tP = new testProgram();
tP.print(baseClass);
tP.print(derivedA);
tP.print(derivedB);
我需要做些什么改变????
提前谢谢
解决方案
I have four classes as follow
class Base { public void printf() { Console.WriteLine("I am fro base !!!"); } } class DerivedA : Base { public void printf() { Console.WriteLine("I am fro derived A !!!"); } } class DerivedB : Base { public void printf() { Console.WriteLine("I am fro derived B !!!"); } } class testProgram { public void print(Base baseClass) { baseClass.printf(); } }
my aim is when I execute following code in line 4 it must give me error.
testProgram tP = new testProgram();
tP.print(baseClass);
tP.print(derivedA);
tP.print(derivedB);
What changes I need to do ????
thanks in advance
解决方案
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