How can I put a number like m.dddddd+Exx

I don't know how can I put a number like m.dddddd+Exx or m.ddddddE-xx using DecimalFormat
or NumberFormat

Here's a quote from the API documentation for DecimalFormat:
Scientific Notation
Numbers in scientific notation are expressed as the product of a mantissa and a power of ten, for example, 1234 can be expressed as 1.234 x 10^3. The mantissa is often in the range 1.0 <= x < 10.0, but it need not be. DecimalFormat can be instructed to format and parse scientific notation only via a pattern; there is currently no factory method that creates a scientific notation format. In a pattern, the exponent character immediately followed by one or more digit characters indicates scientific notation. Example: "0.###E0" formats the number 1234 as "1.234E3".
(End quote.) More explanation follows this in the documentation.

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