java - 如果字符串以字符串结尾，则从字符串中删除半冒号 [英] java - removing semi colon from a string if the string ends with it

问题描述

我有一个要求，如果它出现在字符串的末尾（仅在结尾处），我需要删除分号。我试过以下代码。但它仍然没有被取代。任何人都可以在行号中的以下代码中告诉我需要更改的内容

（我在这里引用了代码如何从Java中的特定字符串中删除特定字符？）

I have a requirement in which I need to remove the semicolon if it is present at the end of the String(only at the end). I have tried the following code. But still it is not getting replaced. Can anyone please tell what I need to change in the following code in the line number
(I referred the code from here How do I delete specific characters from a particular String in Java?)

public static void main(String[] args) {
    String text = "wherabouts;";
    System.out.println("SSS "+text.substring(text.length()-1));
    if(text.substring(text.length()-1) == ";"){
        text.replaceAll(";", "");
    }
    System.out.println("TEXT : "+text);
}

推荐答案

text.replaceAll(";", "");

由于Java中的字符串是不可变的，所以 replaceALl（）方法不进行就地替换，而是返回一个新的修改后的字符串。因此，您需要将返回值存储在其他字符串中。另外，要匹配最后的分号，您需要在之后使用 $ 量词;

Since Strings in Java are immutable, so replaceALl() method doesn't do the in-place replacement, rather it returns a new modified string. So, you need to store the return value in some other string. Also, to match the semi-colon at the end, you need to use $ quantifier after ;

text = text.replaceAll(";$", "");

$ 表示自字符串结束你想要替换最后的分号 ..

$ denotes the end of the string since you want to replace the last semi-colon..

如果你不使用 $ ，它将替换你的字符串中的所有; ..

If you don't use $, it will replace all the ; from your strings..

或，对于你的工作，你可以简单地使用它，如果你想删除最后一个; ：

Or, for your job, you can simply use this, if you want to remove the last ;:

    if (text.endsWith(";")) {
        text = text.substring(0, text.length() - 1);
        System.out.println(text);
    }

更新：并且，如果还有更多半-colons结尾：

UPDATE: And, if there are more semi-colons at the end:

text = text.replaceAll(";+$", "");

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