public class Employee extends Info implements Data { public void load() { /*do something*/ } }
public class Employee implements Info extends Data { public void load() { /*do something*/ } }
public class Employee extends Info implements Data { public void load() { /*do something */ } public void Info.load() { /*do something*/ } }
public class Employee implements Info extends Data { public void Data.load() { /*dsomething */ } public void load() { /*do something */ } }
public class Employee implements Info extends Data { public void load() { /*do something */ } public void Info.load(){ /*do something*/ } }
public class Employee extends Info implements Data{ public void Data.load() { /*do something*/ } public void Info.load() { /*do something*/ } }
第1题:
下面程序输出的结果是【 】。
include <iostream>
using namespacc std;
class A {
public:
void show(){tout<<"A!";}
};
class B: public A{
public:
virtual void show(){cout<<"B!";}
};
class C: public B{
public:
virtual void show(){cout<<"C!";}
};
void show_info(A *i){i->show();}
void main(){
A ia;B ib;C ic;show_info(&ia); show_info(&ib);show_info(&ic);
}
第2题:
下列程序片段中,能通过编译的是( )。
A.public abstract class Animal{public void speak( );}
B.public abstract class Animal{public void speak( ){};}
C.public class Animal{pubilc abstract void speak( );}
D.public abstract class Animal{pubile abstract void speak( ){};}
第3题:
下列程序片段中,能通过编译的是
A.public abstract class Animal{ public void speak();}
B.public abstract class Animal{ public void speak(){}}
C.public class Animal{ public abstract void speak();}
D.public abstract class Animal{ public abstract void speak(){}}
第4题:
下列程序片段中,能通过编译的是( )。
A.public abstract class Animal{ public void speak;}
B.public abstract class Animal{ public void speak{);}
C.public class Animal{ pubilc abstract void speak;}
D.public abstract class Animal{ pubile abstract void speak{};}
第5题:
下面程序输出的结果是【 】。
include <iostream>
using namespace std;
class A {
public:
virtual void show() {cout<<"A!";
};
class B: public A {
public:
void show() {cout << "B!";}
};
class C: public B{
public:
void show(){cout << "C!";}
};
void show_info(A &i) {i. show();}
void main() {
A ia; B ib; C ic; show_info(ia);show_info(ib); show_info(ic); }
第6题:
A.
B.
C.
D.
E.
F.
第7题:
interface A{
int x = 0;
}
class B{
int x =1;
}
class C extends B implements A {
public void pX(){
System.out.println(x);
}
public static void main(String[] args) {
new C().pX();
}
}
错误。在编译时会发生错误(错误描述不同的JVM 有不同的信息,意思就是未明确的
x 调用,两个x 都匹配(就象在同时import java.util 和java.sql 两个包时直接声明Date 一样)。
对于父类的变量,可以用super.x 来明确,而接口的属性默认隐含为 public static final.所以可
以通过A.x 来明确。
第8题:
下列关于Test类的定义中,正确的是______。
A) class Test implements Runnabte{
public void run(){}
public void someMethod(){}
B) class Test implements Rnuuable{
public void run();
}
C) class Test implements Rnuuable{
public void someMethod();
}
D) class Test implements Rnuuable{
public void someMethod();{}
}
A.
B.
C.
D.
第9题:
下面的代码中有什么错误吗?_______
using System;
class A
{
public virtual void F(){
Console.WriteLine("A.F");
}
}
abstract class B:A
{
public abstract override void F();
第10题:
Which three demonstrate an “is a” relationship?()