The number of #'s 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);
}
}
运行结果如下:
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);
}
}
运行结果如下:
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);
}
}
【number_format】
