Using object variables inside other classes

Question

I have an object whose functions I would like to call from with in another class for example

class smo {

    int spoon = 10;

    smo() {
    }

    int get_spoon() {
        return spoon;
    }
}

class boat {

    boat() {
    }

    print_smo(Object test) {

        test.get_spoon();

    }
}

it tells me that the function get.spoon() does not exists. The error makes sense since the object hasn't been created the function can't be called, but it will exists when its run and I have passed an appropriate object of the type smo to it.

Reformatted code; please revert if incorrect.

trashgod
– trashgod

2010-06-19 04:02:11 +00:00
Commented Jun 19, 2010 at 4:02 — trashgod
– trashgod, Commented Jun 19, 2010 at 4:02

Jack · Accepted Answer · 2010-06-19 04:03:19Z

4

Since Java has a static syntax check it needs to know the right type of your objects before running the program. And since it doesn't have any kind of type inference it's a programmer's duty to declare them in source code.

This means that to actually call the smo's method get_spoon() on a smo object you have to declare that it will be of that type and not just an Object (which is the least specific type possible in Java):

void print_smo(smo test)
{
  test.get_spoon();
}

this will work.. and will let you to call oneBoot.print_smo(new smo()).

Two side notes:

class names should be camelcased in this way: ClassName
methods and variable should be camelcased too but without first letter, eg: myLongVariable

edited Jun 19, 2010 at 4:03

answered Jun 19, 2010 at 3:58

Jack

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3 Comments

James Over a year ago

I just found as always, immediately after asking, the answer. java.sun.com/docs/books/tutorial/java/javaOO/arguments.html Thank you though.

Adam Robinson Over a year ago

@Doodle: You should accept this answer by clicking the checkmark. You should also go back to your old questions and mark the appropriate answers as accepted.

James Over a year ago

@Adam Robinson: :P theres a wait time :)

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