Calling another method from the main method in java?

You can only call instance method like do() (which is an illegal method name, incidentally) against an instance of the class.

Check out for the static before the main method, this declares the method as a class method, which means it needs no instance to be called. So as you are going to call a non static method, Java complains because you are trying to call a so called "instance method", which, of course needs an instance first ;).

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