Stack (collection) to int via String

[aborgeld]

 public int getOldXIndex() {
   
        oldXIndex.pop();
        String s = oldXIndex.toString();
        int i= Integer.parseInt(s);
        return i;
    }

this is the problem[], but how can i get this 9 to an int?

Error: Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "[9]"

[KevinWorkman]

What is oldXIndex? What happens when you call its toString()? What are you doing with the value you pop from it?

[aborgeld]

Hi,

oldXIndex? its the Stack variable and it holds a [10].
With the pop it becomes [9]

When i call to string it seems to get "[9]" and thats when the numberformat exception comes, because of [].

The question would be, how do i get a good int of an Item in a Stack collection.

Maybe there are other ways.

Kind regards,

André

[KevinWorkman]

I'm pretty sure you don't want to be using the Stack's toString(). I'm still not clear what you're trying to do- are you trying to print the last item popped? The item at the top? The size? Something else?

[aborgeld]

The item after a pop, so this is the last item.

[aborgeld]

Think away the pop. I want to convert the last item of a Stack into an int.

[KevinWorkman]

Are you looking for the peek() method?

Recommended reading: Stack (Java Platform SE 6)

[aborgeld]

yeap this works