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I have the following code fragment
System.out.printf("%b\n", 123);
which prints “true”.
Can somebody explain this behavior? shouldn’t this throw a IllegalFormatException?
Well since the specification says:
“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(). Otherwise, the result is “true”. ” (src)
The behavior is quite expected isn’t it? Why they decided to implement it that way – no idea, I’d agree that it’s not intuitive (but well it follows C which also prints just anything if you give it the wrong arguments 😉 )