无法替换字符串中的字符 [英] Unable to replace characters in a String

问题描述

我正在尝试浏览一个字符数组，并用另一个数组中的并行字符替换字符串中的字符。

I am trying to go through an array of characters and replace that character in the string with the parallel character in the other array.

private String replace(String input)
{
    char[] first = {'a','e','o','s'};
    char[] second = {'@','3','0','$'};
    String myCopy = input.toLowerCase();


    for(int y = 0; y < first.length; y++)
    {
        myCopy.replace(first[y],second[y]);
    }


    return myCopy;
}

以下是我得到的例子：

Enter a string: as the dog runs here
Output: as the dog runs here

它总是输出相同的字符串而没有替换。

It always outputs the same string with no replacements.

我也尝试过使用：

myCopy.replace('a','@');

and

myCopy.replace("a","@");

和replaceAll方法。

and the replaceAll method.

任意建议？

推荐答案

字符串在Java中是不可变的。 replace（）不更改您调用它的字符串 - 返回带有更改的新字符串。所以你想要：

Strings are immutable in Java. replace() doesn't change the string you call it on - it returns a new string with the changes. So you want:

myCopy = myCopy.replace(first[y], second[y]);

（所有 <$ c $上的方法也是如此c>字符串看起来正在改变它，因为它是不可变的。）

(The same is true for all the methods on String which "appear" to be changing it, as it's immutable.)

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