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The Java Developers Almanac 1.4Order this book from Amazon. |
e313. Formatting a Number in Exponential NotationThe `E ' symbol specifies that a number should be formatted in
exponential notation. The symbol also separates the mantissa from the
exponent. The 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.
// Using only 0's to the left of E forces no decimal point NumberFormat formatter = new DecimalFormat("0E0"); String s = formatter.format(-1234.567); // -1E3 formatter = new DecimalFormat("00E00"); s = formatter.format(-1234.567); // -12E02 formatter = new DecimalFormat("000E00"); s = formatter.format(-1234.567); // -123E01 formatter = new DecimalFormat("0000000000E0"); s = formatter.format(-1234.567); // -1234567000E-6 // Force minimum number of digits to left and right of decimal point formatter = new DecimalFormat("0.0E0"); s = formatter.format(-1234.567); // -1.2E3 formatter = new DecimalFormat("00.00E0"); s = formatter.format(-1234.567); // -12.35E2 s = formatter.format(-.1234567); // -12.35E-2 // The number of #'s to the left of the decimal point (if any) specifies // the multiple of the exponent. The total number of #'s (left and right) // of the decimal point) specifies, the maximum number of digits to display formatter = new DecimalFormat("#E0"); // exponent can be any value s = formatter.format(-1234.567); // -.1E4 s = formatter.format(-.1234567); // -.1E0 formatter = new DecimalFormat("##E0"); // exponent must be multiple of 2 s = formatter.format(-1234.567); // -12E2 s = formatter.format(-123.4567); // -1.2E2 s = formatter.format(-12.34567); // -12E0 formatter = new DecimalFormat("###E0"); // exponent must be multiple of 3 s = formatter.format(-1234.567); // -1.23E3 s = formatter.format(-123.4567); // -123E0 s = formatter.format(-12.34567); // -12.3E0 s = formatter.format(-1.234567); // -12.3E0 s = formatter.format(-.1234567); // -123E-3
e312. Formatting and Parsing a Number for a Locale e314. Formatting and Parsing Locale-Specific Currency e315. Formatting and Parsing a Locale-Specific Percentage
© 2002 Addison-Wesley. |