Question

I’m trying to make an section of code in mouseClicked remove any rectangles clicked on from a Vector. All the rectangles are properly stored in the vector and the point I’m checking for is valid when I run the program. Looking at the documentation, there is indeed a rectangle.contains(point) method, so i’m not sure why the following snippet is invalid. Thanks!

public void mouseClicked(MouseEvent m)
    {

      Point p = new Point(m.getPoint());
      Vector v = ball.r; //ball.r is where they are put into in another object's method
      boolean done = false;
      int i = 0;

      while (!done)
      {
        if(v.elementAt(i).contains(p))
        {
          v.removeElement(i);
          i--; //prevent i from incrementing
        }
        i++;
      }
    }

Also I did not do this in a for loop because, as far as I know, when an element is removed, the vector will “repack” and I will jump over an element of the vector. Not sure if I am right or wrong in saying/doing this.

Answer 1

C:\Users\Alex\Downloads\Bounce2\Bounce2.java:217: cannot find symbol symbol : method contains(java.awt.Point) location: class java.lang.Object if(v.elementAt(i).contains(p)) 

This error message indicates that the compiler is looking for the contains() method in the Object class. In otherwords, v.elementAt(i) returns an Object, not a Rectangle. To fix this, you need to change your declaration for v as follows:

Vector<Rectangle> v = ball.r;

Hope this helps!