//TestFormatStringBuilder.java

public class TestFormatStringBuilder
{
    public static void main(String[] args)
    {
        //String fmt = "%8.3f";
        String fmt = "%";
        fmt += 8;
        fmt += ".";
        fmt += 3;
        fmt += "f";
        System.out.format(fmt, 1.2);
        System.out.println();
    }
}