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You have to put the boolean variable's name instead of "boolean".

You can't compare a declarator with something.

Yeah as I mentioned you can create objects out of classes in the environment, but if you export the whole thing you need a main() method.

Sorry, my mistake.
You do need a main() method I remember.
But maybe clarky2006 is not aware of that because in BlueJ you have the availability to create an object out of a class without a main()...

@Norm
yes the jar differs from normal ones because it has package.bluej included
like if you have the classes test1, test2, test3 the jar will have
META-INF
test1.class
test2.class
test3.class...

In BlueJ you have no main() method.
In the environment you have different classes and at when you export it to jar, you can choose which class you want to be the main class.
The chosen main class...