Subject: Var access question... 2006-11-01 - By Karr, David
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I often implement private getters for properties that should only be
accessed from within the class. I like to keep local variables and
instance variables semantically apart, to emphasize that instance
variables should only be declared if they're really necessary.
> -- --Original Message-- --
> From: A mailing list for Java(tm) 2 Platform, Enterprise
> Edition [mailto:J2EE-INTEREST@(protected)] On Behalf Of Ne'Bahn
> Sent: Tuesday, October 31, 2006 4:59 AM
> To: J2EE-INTEREST@(protected)
> Subject: Var access question...
>
> Hi list, I'm wondering if it's a good practice to access
> fields (in the same class) through its names and not by its
> accessors, e.g.
>
> public class ComplexNumber {
> private double U;
> private double V;
>
> // constructor deleted
>
> public double real() {
> return U;
> }
>
> public double imaginary() {
> return V;
> }
>
> public double magnitude() {
> return (Math.sqrt(Math.pow(U, 2) + Math.pow(V, 2)));
> // access here must be U or real(), same with V }
>
> public double arg() throws ArithmeticException {
> return (Math.atan(V / U));
> // access here must be U or real(), same with V }
>
> public ComplexNumber times(ComplexNumber Z) {
> return new ComplexNumber(U * Z.U - V * Z.V, U * Z.V + V * Z.U); } }
>
> I think it accomplish to OOP rules (encapsulation), the
> object itself manages its state interacting with its fields
> and no other can change their properties, but I've seen many
> samples that use getters methods to access values, I don't
> know why...any clue ???
>
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