Unless you use the BigDecimal class, there is no such thing as a "format" for a number. It is stored as 32 or 64 bits, which represent the value (or as close as possible) and this doesn't change. You can display the number in any format, probably best done with the % tags in the printf() Formatter#format() and String#format() methods. Start reading in the Java™ Tutorials.
What do you have to say for yourself? Hmmm? Anything? And you call yourself a tiny ad.