I am just learning and would like to know about a piece of code that sets the object variable.
What is the correct way to set object variable bfield in the follwoing test class?
public class test {
private String afield;
private String bfield;
public test() {
buildList();
}
public void buildList() {
some code to derive and populate afield.
this.bfield = this.afield; // ( 1)
setBfield(afield); // (2) say getter and setters do exist
bfield = afield; // (3)
}
What is the right way to do? I soption 1 OK or option 2?
setter/getters are more preferable because you can encapsulate some processing in those accessor methods too
Also See
Any of the three will work, of course.
I generally don't like option 1, unless i'm differentiating between an instance member and an argument. For example, public void buildList(String bfield) { this.bfield = bfield; }
public void buildList(String bfield) { this.bfield = bfield; }
. this.everything
is extra noise; if you don't need it, all it does is give the bugs more code to hide in. :)
Option 2 is more future-proof; if ever you change things so that something else has to be set along with bfield
(or if bfield
doesn't need a backing field at all -- for instance, if setting it should set something on a sub-object), you'll be glad you called setBfield
-- cause you won't have a dozen places to change code that sets bfield
. Basically, if you need and already have a setBfield
method, i'd recommend using it in most cases.
If you have a field you know will always be contained within the object itself, and is independent of other fields, option 3 is typically faster. Plus, you don't have to create a setter (read: pollute your interface), if you don't want outside code to be able to set bfield
as well.
Use eclipse! Let it do some work for you. Create a class Test like this.
public class Test {
private String afield;
private String bfield;
}
and then do these:
done :) and do lookup for java bean convention. your code would freak out any java exp dev! :)
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