Specifying Precision : Number Format « Data Type « Java Tutorial

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2. Data Type
3. Number Format

A precision specifier can be applied to the %f, %e, %g, and %s format specifiers.

When applying to floating-point data using the %f, %e, or %g specifiers, it determines the number of decimal places displayed.

The default precision is 6.

For example, %10.4f displays a number at least ten characters wide with four decimal places.

import java.util.Formatter;

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

    fmt = new Formatter();

    fmt.format("%1.4f", 1234567890.123456789);
    System.out.println(fmt);
  }
}

1234567890.1235