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  [SOLVED] (ZetCode Tutorial) someone explain this line please  (Read 480 times)
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Offline alaslipknot
« Posted 2013-04-20 04:36:44 »

am following this tutorial
and i didn't understand the need of this line in the Board class
(ctrl+f to find it easily )

Missile m = (Missile) ms.get(i);

and this
Alien a = (Alien) aliens.get(i);

i know that the variables "m" and "a" are the temporary missile and alien inside the loops, but why the casting ?
(Missile) ms.get(i) ??

i really don't know why i had to cast

thank you

"It's not at all important to get it right the first time. It's vitally important to get it right the last time."
Offline HeroesGraveDev

JGO Kernel

Medals: 231
Projects: 11
Exp: 2 years

If it wasn't Awesome, it wasn't me.

« Reply #1 - Posted 2013-04-20 04:41:37 »

When defining the ArrayList, they don't use generics, so the compiler doesn't know what type the objects pulled out of the arraylist will be.

To avoid casting, define the ArrayList like this:

ArrayList<Missile> missiles = new ArrayList<Missile>();


Offline alaslipknot
« Reply #2 - Posted 2013-04-20 05:37:19 »

Thank you  Grin

"It's not at all important to get it right the first time. It's vitally important to get it right the last time."
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