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);