Hello. Consider the following cl

[rebShaul]

Hello.

Consider the following classes: Obstacle, Collector.
Consider an ArrayList which contains objects of both classes.

My question is how can I determine a specific entry in the array which class it is (Obstacle or Collector)?

Thanks alot,
Shaul.

 

[palbano]

Not a good design. Create a typesafe collection of each rather than putting both types in the same collection.

"But, that's just my opinion... I could be wrong."

-pete

 

[palbano]

Oh... and chiph has a FAQ on the subject: faq732-3363

Thanks chiph

-pete

 

[chiph]

rebShaul -

While you *could* have objects of two different types in an arraylist (since it contains objects of type Object, it will let you do this), it's a bad idea....UNLESS one of the classes inherits from the other. In which case you would do something like this:

Object TempObject = MyArrayList[i];
if (TempObject.GetType.Name == "Obstacle") {
  Obstacle MyObstacle = (Obstacle)TempObject;
  // Do obstacle things with MyObstacle
}
if (TempObject.GetType.Name == "Collector") {
  Collector MyCollector = (Collector)TempObject;
  // Do collector things with MyObstacle
}

But, like Pete says, using a strongly-typed collection is the better way to go, as it becomes obvious what the collection contains, and protects you from your own typing errors by letting the compiler flag them.

Chip H.

 

[rebShaul]

Thanks, Chip H.