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To be honest, I know when to use it but its hard for me to explain. But i'll give it a shot.

With the point operator you can access packages, classes and members.

Skylab.units.users.User;...

No stacey,

Semicolon is used to set the end of the line, like you use a point (.) at the end of a sentence. The semicolon is our way of telling the system here is the end of the line. And if you...