Number Format:00E00 and 000E00

import java.text.DecimalFormat;

public class Main {
  public static void main(String[] argv) throws Exception {

    DecimalFormat formatter = new DecimalFormat("00E00");
    String s = formatter.format(-1234.567);
    System.out.println(s);
  }
}

-12E02

import java.text.DecimalFormat;

public class Main {
  public static void main(String[] argv) throws Exception {
    DecimalFormat formatter = new DecimalFormat("000E00");

    String s = formatter.format(-1234.567); // -123E01
    System.out.println(s);
  }
}