Top 16 Java Utility Classes

In Java, a utility class is a class that defines a set of methods that perform common functions. This post shows the most frequently used Java utility classes and their most commonly used methods. Both the class list and their method list are ordered by popularity. The data is based on randomly selected 50,000 open source Java projects from GitHub.

Hopefully, you can get some ideas of what are already provided and popular by browsing the list so that you know you don't need to program them by yourself. The names of the methods normally indicate what they do. If the method names are not intuitive enough, you may also check out how other developers are using them in their open source projects.

1. org.apache.commons.io.IOUtils

2. org.apache.commons.io.FileUtils

3. org.apache.commons.lang.StringUtils

4. org.apache.http.util.EntityUtils

5. org.apache.commons.lang3.StringUtils

6. org.apache.commons.io.FilenameUtils

7. org.springframework.util.StringUtils

8. org.apache.commons.lang.ArrayUtils

9. org.apache.commons.lang.StringEscapeUtils

10. org.apache.http.client.utils.URLEncodedUtils

11. org.apache.commons.codec.digest.DigestUtils

12. org.apache.commons.collections.CollectionUtils

13. org.apache.commons.lang3.ArrayUtils

14. org.apache.commons.beanutils.PropertyUtils

15. org.apache.commons.lang3.StringEscapeUtils

16. org.apache.commons.beanutils.BeanUtils

* The utility classes from android are excluded since they are designed for Android apps. If you want to see more details, you can search "utils" in the search portal: http://www.programcreek.com/java-api-examples/index.php. If the name of a utility class does not contain "utils", the class is not selected.

Also org.apache.commons.lang is the old version of import org.apache.commons.lang3.

Category >> Top 10  
If you want someone to read your code, please put the code inside <pre><code> and </code></pre> tags. For example:
<pre><code> 
String foo = "bar";
</code></pre>

  1. Alexey Grigorev on 2016-1-9

    No Guava stats?

  2. Codeer on 2016-3-25

    good tutorials, thanks

  3. Sicchi on 2017-1-13

    nice info learn java more in here UG Library

Leave a comment

*