RE: Instantiation question

["Bartell, Aaron L. (TC)" <ALBartell@xxxxxxxxxxxxxx>]

I appreciate everyone's explanations and now I understand how it works, but
where would I use this in a real world application?  I am trying to break my
mental barrier from RPG to Java.  In RPG I would CHAIN or READ from a file
and the I specs that were created on the compile would hold the info for
each of the fields of that file.

I am just lost as to how this will help me, but then again I don't think
that I am thinking in an object oriented manner.  Please help.

Aaron Bartell

-----Original Message-----
From: Mike.Barton@ecsoft.co.uk [mailto:Mike.Barton@ecsoft.co.uk]
Sent: Wednesday, February 07, 2001 10:15 AM
To: JAVA400-L@midrange.com
Subject: Re: Instantiation question



>Student show = new Student();
>
>Student is a class that has methods that returns info like studentId.  So
I
>have a method named getStudentId() that returns an int.
>
>In my program I reference the method getStudentId() as show.getStudentId
>after I do the above instantiation.  Why do I have to do this vs. doing
>something like Student.getStudentId?

Aaron
     no problem with any question,

think about this, what if you wanted another instance of the class Student
different to the one called show which would have a different studentId.
How would you then reference that one instead of instance show ?

show is an instance of the class Student which has a member studentId in
it.
To retreive show's studentId, use show.getStudentId().
If you want another instance e.g. show2 which has a different studentId in
it,
use show2.getStudentId().

The exception to the above (there always is one isn't there !) is that if
the
studentId is a static member, then you would use Student.getStudentId()
since static means all instances of the class have the same value so there
is
no need to use the instance name.

Hope this clears the mist !

Mike


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