How do I format a number in Java?

Question

How do I format a number in Java?
What are the "Best Practices"?

Will I need to round a number before I format it?

32.302342

Answer 1

Be aware that classes that descend from NumberFormat (and most other Format descendants) are not synchronized. It is a common (but dangerous) practice to create format objects and store them in static variables in a util class. In practice, it will pretty much always work until it starts experiencing significant load.