> For the complete documentation index, see [llms.txt](https://bernardo.gitbook.io/development-docs-java/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bernardo.gitbook.io/development-docs-java/utilities-classes/apache-commons/strings.md).

# Strings

Verify a text is not null and contains text:

```java
StringUtils.isNotBlank(text);
```

Verify a text contains only numbers:

```java
StringUtils.isNumeric(text);
```