Store Classes in ArrayList

[Pablo Salazar]

Hi People
Few day ago, somebody sent me this code.

ArrayList al = new ArrayList();
//Insertar datos en la lista:
al.Add("Ejemplo1");
al.Add("Ejemplo2");

It can store two string in ArrayList, my question is

ArrayList can Store Classes ?

Thanks.

 

[Frank Oquendo]

ArrayList can Store Classes ?

An ArrayList can store references to anything.

--
There are 10 kinds of people. Those who understand binary and those who
don't.

http://code.acadx.com
(Pull the pin to reply)

 

[William Ryan]

Like Frank said, you can store anything. If you look at the .Add
method..you'll see it can take an Object as a parameter
http://msdn.microsoft.com/library/d...frlrfSystemCollectionsArrayListClassTopic.asp ,
hence, anything you want to stick in there is fair game.

 

[Anthony Borla]

Hi People
Few day ago, somebody sent me this code.

ArrayList al = new ArrayList();
//Insertar datos en la lista:
al.Add("Ejemplo1");
al.Add("Ejemplo2");

It can store two string in ArrayList, my question is

ArrayList can Store Classes ?

ArrayList al = new ArrayList();
...
al.Add("Ejemplo1");
...
al.Add(new Person("Jack", ...));
...
al.Add(new Car(NumberPlate, "Ford", ...));
...
al.Add(new Book("I Ching", ...));
...

In fact, any System.Object-derived class instance may be stored in a
System.Collections-contained collection. You can check each stored object's
type before 'extracting' it:

foreach (System.Object o in al)
{
if (o is Book)
{
Book b = (Book) o;
...
}
else if (o is Car)
{
Car c = (Car) o;
...
}
...
}

You may care to check out the relevant documentation for more details.

I hope this helps.

Anthony Borla