The %g format specifier causes Formatter to use either %f or %e, whichever is shorter : Formatter Specifiers « Development « Java Tutorial

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Java Tutorial » Development » Formatter Specifiers 
6.5.3.The %g format specifier causes Formatter to use either %f or %e, whichever is shorterPrevious/Next
import java.util.Formatter;

public class MainClass {
  public static void main(String args[]) {
    Formatter fmt = new Formatter();

    for (double i = 1000; i < 1.0e+10; i *= 100) {
      fmt.format("%g ", i);
      System.out.println(fmt);
    }
  }
}
1000.00 
1000.00 100000 
1000.00 100000 1.00000e+07 
1000.00 100000 1.00000e+07 1.00000e+09
6.5.Formatter Specifiers
6.5.1.Formatting Output with Formatter
6.5.2.The Format Specifiers
6.5.3.The %g format specifier causes Formatter to use either %f or %e, whichever is shorter
6.5.4.Hex: %x, Octal: %o: Integer hexadecimal, Octal integer
6.5.5.%h: Hash code of the argument
6.5.6.%a: Floating-point hexadecimal
6.5.7.Unknown Format Conversion Exception
6.5.8.Formatter with different data types
6.5.9.using the %t specifier with Formatter.
6.5.10.Use Formatter to vertically align numeric values.
6.5.11.Use Formatter to left-justify strings within a table.
6.5.12.Using group separators.
6.5.13.The # symbol shows a digit or nothing if no digit present
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