Java Data Type - 如何以科学记数法显示数字

import java.text.DecimalFormat;
import java.text.NumberFormat;

public class Main {

  public static void main(String args[]) {
    NumberFormat formatter = new DecimalFormat();

    int maxinteger = Integer.MAX_VALUE;
    System.out.println(maxinteger); 
    formatter = new DecimalFormat("0.######E0");
    System.out.println(formatter.format(maxinteger));

    formatter = new DecimalFormat("0.#####E0");
    System.out.println(formatter.format(maxinteger));

    int mininteger = Integer.MIN_VALUE;
    System.out.println(mininteger); 

    formatter = new DecimalFormat("0.######E0");
    System.out.println(formatter.format(mininteger)); 

    formatter = new DecimalFormat("0.#####E0");
    System.out.println(formatter.format(mininteger));

    double d = 0.12345;
    formatter = new DecimalFormat("0.#####E0");
    System.out.println(formatter.format(d));

    formatter = new DecimalFormat("000000E0");
    System.out.println(formatter.format(d)); 
  }
}