Scientific notation: 0.######E0 and 0.0E0

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;

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

  }
}

2.147484E9

import java.text.DecimalFormat;

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

    DecimalFormat formatter = new DecimalFormat("0.0E0");
    String s = formatter.format(-1234.567); // -1.2E3
    System.out.println(s);
    
    s = formatter.format(99999999999999.567); // 1.0E14
    System.out.println(s);
    
  }
}