CODEWITHSUNDEEP
javashapes
user3250769
user3250769

Reputation: 13

How would i getX() from a rectangle in a shape array list

Okay so I have a shape arraylist containing a rectangle. How would i obtain the x coordinate of that rectangle from the arraylist?

I think i didn't make it clear so here it is: So here is the arraylist:

ArrayList<Shape> shapes = new ArrayList<Shape>() ;

Creating the shape:

Shape rec1 = new Rectangle(100,100,200,200);
shapes.add(rec1);

now how can i get the x coordinate? I tried: 

Shape j = (Shape)shapes.get(i);
j.getX()

But that didn't work.. error: cannot find symbol

Upvotes: 0

Views: 1570

Answers (2)

Radiodef
Radiodef

Reputation: 37875

Shape does not necessarily have a single x coordinate. So you could change your ArrayList so its type is Rectangle:

ArrayList<Rectangle> shapes = new ArrayList<Rectangle>();

Or you can get the bounds with getBounds:

Shape s = shapes.get(i);
double x = s.getBounds().getX();

For a Rectangle this basically creates a copy of itself but if you have to include other shapes you don't really have a choice (except some kind of case-by-case casting).

Upvotes: 1

MikkolidisMedius
MikkolidisMedius

Reputation: 4844

Cast the object to a Rectangle, not a Shape (getX() is defined in class Rectangle, not in Shape):

Rectangle r = (Rectangle) shapes.get(i);
r.getX();

However this is not probably what you want: if you have a list of Shapes, not all of them will be Rectangles. You can check whether the object is a Rectangle or not before using it:

Shape j = (Shape) shapes.get(i);
if (j instanceof Rectangle) {
    ((Rectangle) j).getX();
}

Upvotes: 1

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