Java switch-case语句中不区分大小写的匹配 [英] Case insensitive matching in Java switch-case statement

问题描述

我想知道是否有办法在java switch case语句中执行不区分大小写的匹配。默认实现是区分大小写。请参阅下面的示例。

I was wondering if there is a way to perform case insensitive match in java switch case statement. the default implementation is case sensitive. Please see the example below.

public class SwitchCaseTest {

    /**
     * @param args
     */
     public static void main(String[] args) {

        switch ("UPPER") {
            case  "upper" :
                System.out.println("true");
                break;

            default:
                System.out.println("false");
                break;
        }
    }
}

所以上面的语句返回 false 作为输出。我正在尝试使其适用于不区分大小写的匹配，如 String.equalsIgnoreCase（）会这样做。我试图将字符串文字转换为小写，然后比较。但是无法这样做。

So above statement returns false as output. And i am trying make it work for case-insensitive match like String.equalsIgnoreCase() would do. I tried to convert both the string literal to lower case and then compare. but was unable to do so.

推荐答案

如果你想这样做：只需确保输入数据全部为小写，并使用小写的情况......

If you want to do that: just make sure the input data is in all lowercase, and use lowercase cases...

switch ("UPPER".toLowerCase()) {
case  "upper" :

....

本地化问题

此外，年龄较大的本地化问题再次出现，并且也困扰着这个问题......例如，在土耳其语语言环境中，的大写字母i 不是我，但© ...作为回报，我未转换为 i ，而是无点我：ı。不要低估这一点，它可以 一个致命的错误 ......

Localization issues

Also, the ages old issue of localization strikes again, and plagues this thing too... For example, in the Turkish Locale, the uppercase counterpart of i is not I, but İ... And in return, the I is not transformed to i, but a "dotless i": ı. Don't underestimate this, it can be a deadly mistake...

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