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1. java formatter
https://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html
Formatter (Java Platform SE 8 )
'e' '\u0065' Requires the output to be formatted using computerized scientific notation. The localization algorithm is applied. The formatting of the magnitude m depends upon its value. If m is NaN or infinite, the literal strings "NaN" or "Infinity", resp
docs.oracle.com
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