Java Formatting Numbers

import java.util.*;

class FormattingNumbersDemo
{
    public static void main(String arg[])
    {
        Formatter fmt = new Formatter();
        
        for(double i = 1000; i < 1.0e+10; i *= 100)
        {
            fmt.format("%g ", i);
        }
        System.out.println(fmt.out());
        fmt.close();
        
        int accountNumber = 30310;
        double accountBalance = 47927.32;
        System.out.printf("|%d|%8d|%5d|%3d|%n|%f|%5f|%3f|%15.2f|%n", 
            accountNumber, accountNumber, accountNumber, accountNumber,
            accountBalance, accountBalance, accountBalance, accountBalance);    
    }
}