How to pull specific types out of ArrayList?

Miscellaneous Topics
#1

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?

#2

I dont really get what you mean, maybe this?

object getObject(ArrayList list){
	for (int i = 0; i < list.lenght(); i++)
		if (list.get(i) instanceof object) 
			return ((object)list).get(i);
}
#3

^
^ yup, that.

Read this: isAssignableFrom() vs. instanceof

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

#4

You’d actually want to do

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.

#5

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