Formatting a Number in Exponential Notation : NumberFormat « I18N « Java Tutorial

The 'E' symbol specifies that a number should be formatted in exponential notation. 
E symbol separates the mantissa from the exponent. 
E symbol must be followed by one or more '0' symbols. 
The number of '0' symbols specifies the minimum number of digits used to display the exponent.

13.14.1.Format for GERMAN locale
13.14.2.Format for the default locale
13.14.3.Parse a GERMAN number
13.14.4.Formatting a Number in Exponential Notation
13.14.5.Using only 0's to the left of E forces no decimal point
13.14.6.Formatting and Parsing Locale-Specific Currency
13.14.7.Parse number with NumberFormat and Locale
13.14.8.Formatting and Parsing a Locale-Specific Percentage
13.14.9.Parse a number with NumberFormat and Locale.CANADA
13.14.10.Format a number with DecimalFormat
13.14.11.Parse a number for a locale
13.14.12.Format a number for a locale
13.14.13.Use java.text.NumberFormat to format a currency value.
13.14.14.Use grouping to display a number
13.14.15.Set format to two decimal places