What is ValidAssert()? Why can't I find docs for this class?

I'm reading the Osborne SCJP study guide for Java 5. In the section on assertions, there is a line of sample code that reads:
assert (x == 1) : new ValidAssert();What is ValidAssert? I can't find the javadoc for this class on the Sun site, and I don't get any helpful results when I Google this class name. Can anyone tell me what I've missed here?
Thanks,
Jim

Sounds like the study guide defined it themselves and forgot to tell you about it!
There are two forms of the assert statement:
assert booleanExpression;
assert booleanExpression : messageObject;I usually use the second version like this:
assert x > 0 : "You dummy! x is supposed to be positive and here it is " + x;But you could define a class whose toString method formats the assertion error message.
That would be handy if you want to factor the message details out, if you
want to use message bundles to localize the messages, etc...

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What is ValidAssert()? Why can't I find docs for this class?

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