[NSWI080] Fwd: Task 2 - Java - Accessing (non existing) optional field

[Matúš Maďar]

---------- Forwarded message ---------
From: Matúš Maďar <semicco2 at gmail.com>
Date: Sun, Apr 3, 2022 at 7:23 PM
Subject: Re: [NSWI080] Task 2 - Java - Accessing (non existing) optional
field
To: Petr Tuma <petr.tuma at d3s.mff.cuni.cz>


How to use isSet()? I can't find any static method like this. The only Java
method isSet() I can find (on Google) is one in java.util.Calendar class. I
can't find anything like isSet() similar to PHP.
Thanks

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On Sun, Apr 3, 2022 at 6:41 PM Petr Tuma <petr.tuma at d3s.mff.cuni.cz> wrote:

> Hi,
>
> you should first check whether the field is set with `isSet`. Calling the
> getter without first checking for presence returns `0` for integers, `0.0`
> for floats, `null` for strings etc.
>
> Petr
>
>
> On 03/04/2022 01:02, Matúš Maďar wrote:
> > Hello all.
> > I haven't found anything in documentation so I'd like to ask. Did anyone
> encounter and can explain, what is the expected behaviour in Java, when you
> try to access optional field in service? E.g. if ItemA doesn't have fieldZ
> defined; will it throw some exception or will it just return default value
> of the type of field?
> > Thanks!
> >
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> > NSWI080 at d3s.mff.cuni.cz
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