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  How to pull specific types out of ArrayList?  (Read 583 times)
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Offline wessles

JGO Wizard


Medals: 66
Projects: 4
Exp: 3 years


Radirius Software Lead Developer


« Posted 2013-06-06 01:33:31 »

I have an abstract class called object. I have an arraylist called objs. I want to pull out only a class that extends object called enemy. Do I use getClass().getSimpleName()? It does not work. What do I do? Make another arraylist all together?

Offline Zhon

Junior Member


Medals: 4



« Reply #1 - Posted 2013-06-06 01:38:09 »

I dont really get what you mean, maybe this?
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object getObject(ArrayList list){
   for (int i = 0; i < list.lenght(); i++)
      if (list.get(i) instanceof object)
         return ((object)list).get(i);
}
Offline wessles

JGO Wizard


Medals: 66
Projects: 4
Exp: 3 years


Radirius Software Lead Developer


« Reply #2 - Posted 2013-06-06 01:41:02 »

Ill try it. STANDBY

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Offline heisenbergman

JGO Coder


Medals: 14


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« Reply #3 - Posted 2013-06-06 01:42:55 »

^
^ yup, that.

Read this: isAssignableFrom() vs. instanceof

So you can either do what you want using isAssignableFrom() or instanceOf.

Offline wessles

JGO Wizard


Medals: 66
Projects: 4
Exp: 3 years


Radirius Software Lead Developer


« Reply #4 - Posted 2013-06-06 01:47:29 »

Okay, but how do I make the object into an enemy? Do I cast it (with objects, I often face difficulty with this)

Offline Troncoso

JGO Coder


Medals: 20



« Reply #5 - Posted 2013-06-06 01:57:57 »

You'd actually want to do

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list.get(i) instanceof Enemy


Considering everything in the list is an Object. And yes, you'd ultimately have to cast it as an Enemy.
Offline wessles

JGO Wizard


Medals: 66
Projects: 4
Exp: 3 years


Radirius Software Lead Developer


« Reply #6 - Posted 2013-06-06 01:59:37 »

Good
I got it. Thanks! Grin

Offline davedes
« Reply #7 - Posted 2013-06-06 13:41:23 »

Using casts like that can be sign of code smell. Smiley See here:
http://alvinalexander.com/java/java-command-design-pattern-in-java-examples

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