Java字符串参数 [英] Java String Parameters

问题描述

我来自.net背景，想知道创建返回布尔值并修改通过参数传递的字符串的方法的可接受方法.我知道字符串在Java中是不可变的，因此下面的代码段将始终产生一个空字符串.我只能返回布尔值.不能抛出异常.如果需要将String类包装在StringHolder中，可以在哪个包中找到它.

I'm coming from a .net background and want to know the accepted way of creating a method that returns a boolean and modifies a string that was passed in via parameter. I understand Strings are immutable in Java so the below snippet will always produce an empty string. I am constrained to return boolean only. Exceptions can't be thrown. If I need to wrap the String class in, say, a StringHolder, what package could I find this in.

public static void DoStuff()
{
    String msg = "";
    if (GetMessage(msg))
    {
       System.out.println(msg);
    }
}

推荐答案

使用java.lang.StringBuilder-本质上是可变的String.但是，返回修改后的String会更安全，更"Java风格".

Use a java.lang.StringBuilder - basically a mutable String. However, it would be safer and more "Java style" to return the modified String.

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