我如何在Java中使用out参数 [英] how i can use out parameter in java

问题描述

在void中有out参数
作为

无效x(输出字符串z)
{
z ="dd";

}

好的
我怎么能在Java中

感谢您的帮助

in c# has out parameter in void
as

void x(out string z)
{
z="dd";

}

ok
how i can in java

thanks for any help

推荐答案

此 [<一个href ="http://www.javacamp.org/javavscsharp/outparam.html" target ="_ blank" title ="New Window"> ^ ]可能会对您有所帮助.

this[^] might help you.

Java不支持out参数；所有参数均按值传递，但是参数可以是可变的引用类型，在这种情况下，即使无法实例性修改参数的实例，也可以在函数内部修改对象本身并返回修改后的对象.

请参见: http://www.javacamp.org/javavscsharp/outparam.html [ http://www.javaranch.com/journal/2003/04/immutable.htm [ ^ ].

—SA

Java does not support out parameter; all parameters are passed by value, but a parameter can be of mutable reference type, in this case, even though the instance of a parameter can not be modified referentially, the object itself can be modified inside the function and returned modified.

See this: http://www.javacamp.org/javavscsharp/outparam.html[^]. A primitive or immutable type can be modified as a result of call by wrapping it in a class or passing it as a reference of array (which is a reference type and mutable.

See also about mutable and immutable objects: http://www.javaranch.com/journal/2003/04/immutable.htm[^].

—SA

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