第11讲 面向对象编程基础(2).ppt

第11讲面向对象编程基础（2）本讲内容一、值类型与引用类型值类型与引用类型值类型与引用类型

多个实例共享一个型，但各自存储自己的属性二、继承与多态概况请开“马自达车”！从“有病”说起#include<stdio.h>

voidPrintHelp();
voidDriveVolvo();
voidDriveBenz();
voidDriveMazda();

main(intargc,char*argvs[])
{
if(argc<2){
PrintHelp();
return;
}

if(strcmp(argvs[1],"V")==0)
DriveVolvo();
elseif(strcmp(argvs[1],"B")==0)
DriveBenz();
elseif(strcmp(argvs[1],"M")==0)
DriveMazda();
else
PrintHelp();解决办法什么是“继承”机动车Musician单继承与多继承“继承”关系的代码实现继承（续）usingSystem;

publicclassBase
{
publicinta=10;
}

publicclassDerived:Base
{
}

publicclassClient
{
publicstaticvoidMain()
{
Derivedd=newDerived();
Console.WriteLine(d.a);
}
}usingSystem;

publicclassBase
{
publicstaticinta=10;
}

publicclassDerived:Base
{
}

publicclassClient
{
publicstaticvoidMain()
{
Derived.a=15;
Console.WriteLine(Base.a);
}
}usingSystem;

publicclassBase
{
publicvoidSayHello()
{
Console.WriteLine("Hello!");
}
}

publicclassDerived:Base
{
}

publicclassClient
{
publicstaticvoidMain()
{
Derivedd=newDerived();
d.SayHello();
}
}usingSystem;

publicclassBase
{
publicstaticvoidSayHello()
{
Console.WriteLine("Hello!");
}
}

publicclassDerived:Base
{
}

publicclassClient
{
publicstaticvoidMain()
{
Derived.SayHello();
}
}usingSystem;

publicclassBase
{
privateinta=10;
publicvoidShowA()
{
Console.WriteLine(a);
}
}

publicclassDerived:Base
{
}

publicclassClient
{
publicstaticvoidMain()
{
Derivedd=newDerived();
d.ShowA();
}
}继承（续）多态（PolyMorphism）“多态”案例“多态”案例（续）多态特点面向对象三要素面向对象学习顺序小结小结（续）