(7-1)Derived类是Base类的子类,下面()语句是错误的。
A、Base Obj = new Derived();
B、Derived Obj = new Base();
C、Base Obj = new Base();
D、Derived Obj = new Derived();
A、Base Obj = new Derived();
B、Derived Obj = new Base();
C、Base Obj = new Base();
D、Derived Obj = new Derived();
A、Base object = new Derived();
B、Base object = new Base();
C、Derived object = new Derived();
D、Derived object = new Base();
A、b = d;
B、p = &d;
C、d = b;
D、p2= &d;
A、package org.open;
B、import java.util.*;
C、class Derived {}
D、public static final CONTST = 1;
class Base
{
public:
void fun(){cout $amp;};
class Derived:public Base
{
void fun()
{
//显示基类的成员函数fun
cout $amp;};
A.fun();
B.Base. fun();
C.Base::fun();
D.Base- >fun-:
A、10
B、10 10
C、编译失败
D、程序可以正常运行,但没有输出内容
A、30
B、30.0
C、30.000
D、编译失败
A、Father Obj = new Derived();
B、Derived Obj = new Father ();
C、Father Obj = new Father();
D、Derived Obj = new Derived ();
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