Joda

Joda is a fantastic Java open-source project that enhances the core Java functionality. The best part of this project is its free availability, which makes it accessible to all. Joda Dates are widely popular for re-implementing date handling in Java from the ground up. The existing Date and Calendar in the core Java libraries have several flaws, which Joda Time addresses effectively. Joda Time is the most active project and has many users worldwide.

Another essential component of Joda is Joda Primitives, which provides a range of interfaces and implementations for collections designed explicitly for primitive types. These implementations are far more effective than wrapping each primitive in an object, giving developers far greater efficiency.

Additionally, Joda Beans provide a standard interface for beans to implement, allowing each property on a bean to become a first-class object. This novel approach enables programs to work in a more comprehensive way than ever before. Developers will relish the versatility and efficiency that Joda Beans offers.

It is worth noting that Joda is available for free under the Apache Software License. With its range of features, Joda is an indispensable tool in any Java developer's arsenal. Overall, if you're looking for a better Java functionality and efficiency, you should undoubtedly try Joda.