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