Hutool 3.9 | 2021

import java.util.Date; import java.util.List;

The defining feature of Hutool 3.9 is its commitment to the . Almost every module in Hutool is accessed via a static class (e.g., StrUtil , FileUtil , HttpUtil ). This design choice removes the friction of object instantiation and dependency injection for simple tasks. hutool 3.9

While newer versions (like 5.x and 6.x) leverage JDK 17+ features, remains a critical dependency for projects unable to upgrade their base Java version. It provides a modern "feel" to older codebases without risking compatibility issues. How to Get Started with Hutool 3.9 import java

One of the standout improvements in the 3.9 series was the overhaul of CsvUtil . While newer versions (like 5

If you are maintaining a system still running on Hutool 3.9, the library is stable but feature-frozen. Modern equivalents of these features in 5.x+ offer better performance, type safety, and support for Java 8+ streams, but the core API signatures remain largely backward compatible.