Java DecimalFormat

External

• http://docs.oracle.com/javase/7/docs/api/java/text/DecimalFormat.html

Internal

• java Format
• SimpleDateFormat
• String.format()

Overview

'#' means display the digit if ? It does not fill up with space.

Simplest

   
private static final Format THREAD_NUMBER_FORMAT = new DecimalFormat("000");

...

THREAD_NUMBER_FORMAT.format(index);

Float/Double with Two Decimals

private static final Format AVERAGE_DURATION_FORMAT = new DecimalFormat("#.00");

...

AVERAGE_DURATION_FORMAT.format(value);

Percentage

Multiply with 100 and display as percentage, with the amount of decimals specified:

private static final Format PERCENTAGE_FORMAT = new DecimalFormat("%0.00");

...

PERCENTAGE_FORMAT.format(value);