1
2
An exception is thrown at runtime.
Compilation fails because of an error in line 8.
Compilation fails because of an error in line 14.
第1题：
下面程序的输出结果是【 】。
include ＜iostream＞
using namespace std;
class base
{
protected:
int a;
public:
base(){cout＜＜"0":}
};
class basel: virtual public base
{
public:
base1(){ cout＜＜"1";}
};
class base2 : virtual public base
{
public:
base2(){cout＜＜"2";}
};
class derived : public base1,public base2
{
public:
derived () {cout＜＜"3"; }
}
int main ()
{
derived obj;
cout＜＜end1;
return 0;
}
第2题：
若有以下程序： #include ＜iostream＞ using namespace std; class A { protected: int a; public: A() { a=10; } }; class A1 : public A { public: A1() { a=a+1; } }; class A2 : public A { public: A2 () { a=a+2; } }; class B : public A1,public A2 { public: B(){} void print() { cout＜＜a＜＜end1; } }; int main ( ) { B obj; obj.print(); return 0; } 程序运行后的输出结果是( )。
A．产生语法错误
B．11
C．12
D．10
第3题：
class A
{public int getNumber(int a){return a+1;}}
class B extends A
{public int getNumber(int a, char c){return a+2;}public static void main(String[] args){B b=new B();System.out.println(b.getNumber(0));}}
what is the result?()
A.compilation succeeds and 1 is printed
B.compilation succeeds and 2 is printed
C.compilation succeeds and 3 is printed
D.An error at this program cause compilation to fail
第4题：
public class X { public X aMethod（） { return this；} } public class Y extends X { } Which two methods can be added to the definition of class Y？（）
第5题：
class A { protected int method1（int a， int b） { return 0； } } Which two are valid in a class that extends class A？（）
第6题：
若有以下程序：
include ＜iostream＞
using namespace std;
class Base
{
public:
void who()
{
cout＜＜"class Base"＜＜end1;
}
};
class Derivedl : public Base
{
public:
void who()
{
cout＜＜"class Derivedl"＜＜end1;
}
};
class Derived2 : public Base
{
public:
void who()
{
cout＜＜"class Derived2"＜＜end1;
}
};
int main()
{
Base *p;
Derivedl obj1;
Derived2 obi2;
p=&obj 1;
p=&obj2;
p-＞who ( );
return 0;
}
则该程序运行后的输出结果是【 】。
第7题：
有如下程序： #include ＜iostream.h＞ class x { protected: int a; public: x() { a=1; } }; class x1 : virtual public x { public: x1() { a+=1; cout＜＜a; } }; class x2 : virtual public x { public: x2() { a+=2; cout＜＜a; } }; class y : public xl,public x2 { public: y() { cout＜＜a＜＜end1; } }; int main() { y obj; return O; } 该程序运行后的输出结果是( )。
A．1
B．123
C．242
D．244
第8题：
A.Foo { public int bar() { return 1; }
B.new Foo { public int bar() { return 1; }
C.new Foo() { public int bar() { return 1; }
D.new class Foo { public int bar() { return 1; }
第9题：
1. public class ReturnIt { 2. return Type methodA（byte x， double y） { 3. return （long）x / y * 2； 4. } 5. } What is the narrowest valid returnType for methodA in line2？（）
第10题：
public class OuterClass { private double d1 1.0； //insert code here } You need to insert an inner class declaration at line2. Which two inner class declarations are valid？（）