Based on the review, I recommend:
Before Java 8's java.time API was widely adopted in enterprise legacy systems, java.util.Date and Calendar were the standards.
public class Hutool39FeatureDemo {
import java.util.Date; import java.util.List;
Here are some of the notable new features in Hutool 3.9: hutool 3.9
Hutool 3.x expanded beyond data processing to interact with the system environment.
Supports GET/POST requests and file uploads with minimal code. JSON processing. Fast parsing and conversion between Beans and JSON. hutool-db Simplified JDBC. Execute SQL and handle CRUD operations without boilerplate. Notable Features in Version 3.9 Based on the review, I recommend: Before Java 8's java
cn.hutool hutool-all 3.9.3 Use code with caution.
Based on the review, I would rate Hutool 3.9 as follows: JSON processing
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.