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Finally, thanks before.
Literally, I,m stiil Confused. But thank you very much.
should I make getStatementsCount() method for each class, and then I compare ?
or just one method in main class ?
...

from the new stm, I can this :

The Total Of Statement is :
The Max of Print Argument is :
The deep of tree is :
That Code is :

So, if I have statement like this :

Stm s = new...

I have a statement like this

Stm s = new CompoundStm(new AssignStm("a", new NumExp(6)), new PrintStm(new PairExpList(new NumExp(8), new LastExpList(new IdExp("b")))));

and I have to get the...