Java printf and Booleans

The available stdout mapping in Java, System.out (PrintStream), supports printf (to format a string when outputting it) in the same manner as other languages such as C. By using System.out.printf instead of System.out.print, you can also provide a formatting string which the method can use to write the output in a custom format.

As Java supports several other native datatypes that weren’t available as regular C-types, you also have a few other options. One of these are the %b / %B identifier, which represents a boolean value.

The format string “%b” expects one argument, a boolean. This will be written as either ‘true’ or ‘false. You would (as of writing) get the same result by using the %s identifier as this would cast the boolean of a string, which in turn would give true or false, but it’s always better to be explicit about what you are doing than assuming that people understand that you understood something (which even could change..).

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