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


import java.text.DecimalFormat;

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);
  }
}

Output:


-.1E4
-.1E0

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


import java.text.DecimalFormat;

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);
  }
}

Output:


-12E2
-1.2E2
-12E0

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


import java.text.DecimalFormat;

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);
  }
}

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