Re: A basic question about constants

In article <42e1fbdb$0$29943$636a15ce@xxxxxxxxxxxx>,
Richard <grin@xxxxxxxx> wrote:

> Hello,
>
> An extract from the javadoc of javax.sql.rowset.CachedRowSet (an interface):
> ---
> COMMIT_ON_ACCEPT_CHANGES
>
> static final boolean COMMIT_ON_ACCEPT_CHANGES
>
> Causes the CachedRowSet object's SyncProvider to commit the changes when
> acceptChanges() is called. If set to false, the changes will not be
> committed until one of the CachedRowSet interface transaction methods is
> called.
>
> See Also:
> commit(), rollback(), Constant Field Values
> ---
>
> My basic question is: how is it possible to change the value of a
> constant defined in an interface?
>
> Thanks in advance for your answers.
>
> Richard

AFAIK, you can't: "Every field declaration in the body of an interface
is implicitly public, static, and final." [§9.3] The value is set by the
implementation so you'll know how to handle commits:

"Note: The acceptChanges() method will determine if the
COMMIT_ON_ACCEPT_CHANGES is set to true or not. If it is set to true,
all updates in the synchronization are committed to the data source.
Otherwise, the application _must_ explicit[l]y call the commit() or
rollback() methods as appropriate." [J2SE 1.5 API]

--
John
jmatthews at wright dot edu
www dot wright dot edu/~john.matthews/
.

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