Question

I have created two classes and I am trying to invoke a constructor(with argument) and a method. I find it easy if I just use an object.

My Goal :

1. To invoke the same method by using 3 objects.
2. Use ArrayList to invoke the method 3 times.

My Homework:
I did google a bit. I happen to end with explanation of ArrayList and certain examples of it. I did not find examples which I think I need i.e. using ArrayList with Objects(like my citation).

public class DrawGraphics
{
    BouncingBox box;

    /** Initializes this class for drawing. */
    public DrawGraphics()
    {

            box = new BouncingBox(200, 50, Color.green);

            box.setMovementVector(1, 1);
    }
//..................
//................
}

Thank you for those who try to help.

Answer 1

Continuing with your example this might give you an idea of what Lists can be used for:

// Let's create an ArrayList that will contain the bouncingboxes
List<BouncingBox> boxList = new ArrayList<BouncingBox>();    

// Let's create 5 of them and add them to the end of the List
for (int ii=0;ii<5;ii++) {
    boxList.add(new BouncingBox(200, 50, Color.green));
}

// Iterate over the List we just created with the enhanced for - the method will
// be called on all objects in the List.
for (BouncingBox box : boxList) {
    box.setMovementVector(1, 1);
}

Is this what you were looking for?