如何使我的字符串比较不区分大小写? [英] How do I make my string comparison case-insensitive?

问题描述

我创建了一个Java程序来比较两个字符串:

I created a Java program to compare two strings:

String str = "Hello";

if (str.equals("hello")) {
    System.out.println("match");
} else {
    System.out.println("no match");
}

区分大小写.我该如何更改以免更改?

It's case-sensitive. How can I change it so that it's not?

推荐答案

最好的方法是使用 .为此专门进行了优化.

The best way is to use str.equalsIgnoreCase("foo"). It's optimized specifically for this purpose.

在将它们与 equals 进行比较之前，您还可以将两个字符串都转换为大写或小写形式.对于其他可能没有等价于 equalsIgnoreCase 的语言，这是一个非常有用的技巧.

You can also convert both strings to upper- or lowercase before comparing them with equals. This is a trick that's useful to remember for other languages which might not have an equivalent of equalsIgnoreCase.

str.toUpperCase().equals(str2.toUpperCase())

如果您使用的是非罗马字母，请注意 equalsIgnoreCase 的JavaDoc这部分内容，

If you are using a non-Roman alphabet, take note of this part of the JavaDoc of equalsIgnoreCase which says

请注意，此方法不考虑语言环境，并且会导致某些地区的搜索结果不令人满意.整理器类提供了对语言环境敏感的比较.

Note that this method does not take locale into account, and will result in unsatisfactory results for certain locales. The Collator class provides locale-sensitive comparison.

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