%b Formats a boolean value (wrapper or primitive) : 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);
        boolean b = false;
        f.format("The value is %b, so there.", b);
        System.out.println(sb);
    }
}

The value is false, so there.