import java.text.DecimalFormat; // Java 1.4+ Compatible // // The following example code demonstrates converting a number // (double) into a formatted String in scientific notation setting // the number of digits after the decimal place and in the exponent // public class FormatDecimalScientificNotation { public static void main(String[] args) { // speed of light in m/s double number = 299792458; // scientific notation, three decimal places, one exponent digit DecimalFormat df = new DecimalFormat("0.000E0"); System.out.println(df.format(number)); // scientific notation, lower case e, two decimal places, two exponent digits df = new DecimalFormat("0.00E00"); System.out.println(df.format(number).toLowerCase()); } }

Here is the output of the example code:

2.998E8 3.00e08

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