在C＃中的命名空间和包在Java中的区别 [英] Difference between namespace in C# and package in Java

问题描述

什么是Java中的C＃命名空间和包之间的差值（使用方面）？

What is the difference (in terms of use) between namespaces in C# and packages in Java?

推荐答案

从：<一href=\"http://www.javacamp.org/javavscsharp/namespace.html\">http://www.javacamp.org/javavscsharp/namespace.html

包用于组织文件或公共类型以避免类型冲突。包构建体可以被映射到一个文件系统。

Packages are used to organize files or public types to avoid type conflicts. Package constructs can be mapped to a file system.

System.Security.Cryptography.AsymmetricAlgorithm aa;

可能被替换：

import System.Security.Crypography; 
class xxx { ...
AsymmetricAlgorithm aa;

有对包没有别名。你必须使用import语句或完全限定点名的具体类型。

There is no alias for packages. You have to use import statement or fully-qualified name to mention the specific type.

package N1.N2;
    class A {}
    class B {}

或

package N1.N2;
   class A {}

另外一个源文件：

Another source file:

package N1.N2;
   class B {}

包不能嵌套。一个源文件只能有一个包语句。

Package cannot be nested. One source file can only have one package statement.

命名空间用于组织程序，无论是作为一个程序的内部组织体系，并作为外部组织体系。

Namespaces are used to organize programs, both as an "internal" organization system for a program, and as an "external" organization system.

System.Security.Cryptography.AsymmetricAlgorithm aa;

可能被替换：

using System.Security.Crypography; 
AsymmetricAlgorithm aa;

替代地，人们可以在该命名空间中指定的别名，例如

Alternatively, one could specify an alias for the the namespace, eg

using myAlias = System.Security.Crypography; 

，然后参照类

myAlias.AsymmetricAlgorithm 

namespace N1.N2
{
    class A {}
    class B {}
}

或

namespace N1
{
    namespace N2
    {
        class A {}
        class B {}
    }
}

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