如何检查 Java 字符串是否全部为空格? [英] How do I check that a Java String is not all whitespaces?

问题描述

我想使用 Java 检查 Java 字符串或字符数组是否不只是由空格组成?

I want to check that Java String or character array is not just made up of whitespaces, using Java?

这是一个非常相似的问题，除了它是 Javascript:
如何检查字符串是否包含字符 &空格，而不仅仅是空格?

This is a very similar question except it's Javascript:
How can I check if string contains characters & whitespace, not just whitespace?

EDIT:我删除了有关字母数字字符的部分，因此更有意义.

EDIT: I removed the bit about alphanumeric characters, so it makes more sense.

推荐答案

我能想到的最短的解决方案:

Shortest solution I can think of:

if (string.trim().length() > 0) ...

这只检查(非)空白.如果你想检查特定的字符类，你需要使用强大的 match() 和一个正则表达式，例如:

This only checks for (non) white space. If you want to check for particular character classes, you need to use the mighty match() with a regexp such as:

if (string.matches(".*\w.*")) ...

...检查至少一个 (ASCII) 字母数字字符.

...which checks for at least one (ASCII) alphanumeric character.

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