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I can understand what your saying, and yes learning from a book can be tedious and boring
at times, but probably does give you more information about a subject and in greater detail.
Like said...

I'm not certain but I think the ACM library is created by an independent organisation
that Oracle/Sun gave approval to for creating a more simplistic version of AWT/Swing for
beginners in Java. You...

Your first method could be invalid.
The compiler does not know whether to fill the square or not.



Change that to

<instance>.setFilled(Boolean);

Where instance is the object name and...

I haven't ever used ACM graphic libraries, but
from what I am guessing your setColor method
should have a Boolean argument passed to it -
possibly "true" so the compiler knows the color
should be...