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

As Robert has pointed out in his answer: DecimalFormat is neither synchronized nor does the API guarantee thread safety (it might depend on the JVM version/vendor you are using).

Use Spring's Numberformatter instead, which is thread safe.