Java Data Type How to - Set the multiple of the exponent

Question

We would like to know how to set the multiple of the exponent.

Answer

The number of #'s to the left of the decimal point sets the multiple of the exponent.

import java.text.DecimalFormat;
/*from   w  w  w.j  av  a  2 s  . co m*/
public class Main {
  public static void main(String[] argv) throws Exception {

    DecimalFormat formatter = new DecimalFormat("#E0"); // exponent can be any
                                                        // value
    String s = formatter.format(-1234.567); 
    System.out.println(s);
    
    s = formatter.format(-.1234567); 
    System.out.println(s);
  }
}

The code above generates the following result.

DecimalFormat("##E0") (exponent must be multiple of 2)

import java.text.DecimalFormat;
/*from  w w w.j av a 2  s .c om*/
public class Main {
  public static void main(String[] argv) throws Exception {
    DecimalFormat formatter = new DecimalFormat("##E0"); 
    String s = formatter.format(-1234.567);
    System.out.println(s);
    s = formatter.format(-123.4567);
    System.out.println(s);
    s = formatter.format(-12.34567);
    System.out.println(s);
  }
}

The code above generates the following result.

DecimalFormat("###E0") (exponent must be multiple of 3)

import java.text.DecimalFormat;
//  w ww .  jav  a  2s .c  o  m
public class Main {
  public static void main(String[] argv) {

    DecimalFormat formatter = new DecimalFormat("###E0"); 
    String s = formatter.format(-1234.567); // -1.23E3
    System.out.println(s);
    s = formatter.format(-123.4567); // -123E0
    System.out.println(s);
    s = formatter.format(-12.34567); // -12.3E0
    System.out.println(s);
    s = formatter.format(-1.234567); // -12.3E0
    System.out.println(s);
    s = formatter.format(-.1234567); // -123E-3
    System.out.println(s);
  }
}