c# 类对象和实例对象_C＃类和对象能力问题套装4

c# 类对象和实例对象

1) What are the correct statements about given code snippets?

using System;
public class Example
{
virtual private int X;
private int Y;
static void Main(string[] args)
{
Console.WriteLine("Hello World");
}
}

Hello World
HelloWorld
Syntax Error
Runtime Exception

Answer & Explanation

Correct answer: 3
Syntax Error

The above code will generate a syntax error.

The output would be,

1)关于给定代码段的正确陈述是什么？

 using System ;
public class Example
{
virtual private int X ;
private int Y ;
static void Main ( string [ ] args )
{
Console . WriteLine ( " Hello World " ) ;
}
}

你好，世界
你好，世界
语法错误
运行时异常

答案与解释

正确答案：3
语法错误

上面的代码将生成语法错误。

输出将是

2) What is the correct output of given code snippets?

using System;
public class Example
{
private int X;
private int Y;
Example()
{
this.X = 1;
this.Y = 2;
}
static void Main(string[] args)
{
Example Ob = new Example();
Console.WriteLine("{0}, {1}", Ob.X, Ob.Y);
}
}

1, 2
12
Syntax Error
Runtime Exception

Answer & Explanation

Correct answer: 1
1, 2

The above code will print (1, 2) on the console screen.

2)给定代码段的正确输出是什么？

一二
12
语法错误
运行时异常

答案与解释

正确答案：1
一二

上面的代码将在控制台屏幕上打印(1，2)。

3) What is the correct output of given code snippets?

using System;
public class Example
{
private int X;
private int Y;
public Example()
{
this.X = 1;
this.Y = 2;
}
public static ShowData()
{
Console.WriteLine("{0}, {1}", this.X, this.Y);
}
static void Main(string[] args)
{
Example Ob = new Example();
Ob.Show();
}
}

1, 2
12
Syntax Error
Runtime Exception

Answer & Explanation

Correct answer: 3
Syntax Error

The above code will generate a syntax error.

The output would be,

3)给定代码段的正确输出是什么？

 using System ;
public class Example
{
private int X ;
private int Y ;
public Example ( )
{
this . X = 1 ;
this . Y = 2 ;
}
public static ShowData ( )
{
Console . WriteLine ( " {0}, {1} " , this . X , this . Y ) ;
}
static void Main ( string [ ] args )
{
Example Ob = new Example ( ) ;
Ob . Show ( ) ;
}
}

一二
12
语法错误
运行时异常

答案与解释

正确答案：3
语法错误

上面的代码将生成语法错误。

输出将是

4) What is the correct output of given code snippets?

using System;
public class Example
{
public Example Method1()
{
Console.Write("####, ");
return this;
}
public Example Method2()
{
Console.Write("@@@@, ");
return this;
}
public Example Method3()
{
Console.Write("$$$$, ");
return this;
}
static void Main(string[] args)
{
Example Ob = new Example();
Ob.Method1().Method2().Method3();
}
}

####, @@@@, $$$$,
$$$$, @@@@, ####,
Syntax Error
Runtime Exception

Answer & Explanation

Correct answer: 1
####, @@@@, $$$$,

The above code will print (####, @@@@, $$$$,) on console screen.

4)给定代码段的正确输出是什么？

####，@@@@，$$$$，
$$$$，@@@@，####，
语法错误
运行时异常

答案与解释

正确答案：1
####，@@@@，$$$$，

上面的代码将在控制台屏幕上打印(####，@@@@，$$$$)。

5) What is the correct output of given code snippets?

using System;
public class Example
{
public void SayHello()
{
Console.Write("Hello World");
}
static void Main(string[] args)
{
this.Method();
}
}

Hello World
Hello world
Syntax Error
Runtime Exception

Answer & Explanation

Correct answer: 3
Syntax Error

In C#.NET we cannot use "this" reference in a static method.

The output would be,

5)给定代码段的正确输出是什么？

 using System ;
public class Example
{
public void SayHello ( )
{
Console . Write ( " Hello World " ) ;
}
static void Main ( string [ ] args )
{
this . Method ( ) ;
}
}