DecimalFormat("##E0") (exponent must be multiple of 2) : Decimal « Data Type « Java Tutorial

1. Java Tutorial
2. Data Type
3. Decimal

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);
  }
}
// -12E2
// -1.2E2
// -12E0