%f Formats a floating-point number : Formatter « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Formatter

import java.util.Formatter;

public class MainClass{
    public static void main(String[] argv){
        StringBuilder sb = new StringBuilder();
        Formatter f = new Formatter(sb);
        float b = 1.1F;
        f.format("The value is %f, so there.", b);
        System.out.println(sb);


    }
}

The value is 1.100000, so there.