StringFormat for Java Boolean Operator

Question

I know its very simple question. but I would like to know the stringformat for boolean operator. For example, below shows the string formats for integer, string and float. what could be for boolean operator true/false?

System.out.printf("The value of the float " +                   "variable is %f, while " +                   "the value of the " +                    "integer variable is %d, " +                   "and the string is %s",                    floatVar, intVar, stringVar);  

Answer 1

'b' or 'B' general If the argument arg is null, then the result is "false". If arg is a boolean or Boolean, then the result is the string returned by String.valueOf(arg). Otherwise, the result is "true". java docs : http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#syntax

Answer 2

System.out.printf("boolean variable is %b",boolVar);