Thread: New to programming

Im trying to write a method here:

public void edgeDection(double amount) 
{
  Pixel topPixel = null;
  Pixel bottomPixel = null;
  double topAverage = 0.0;
  double bottomAverage = 0.0;
  int endY = this.getHeight() - 1;
  for 9int y = 0; y <endY; y++) {
    for (int x = 0; x < this.getWidth(); x++) {
      topPixel = this.getWidth(x,y);
      bottomPixel = this.getPixel(x, y+1)
        topAverage = topPixel.getAverage();
      bottomAverage = bottomPixel.getAverage();
      if (Math.abs(topAverage = bottomAverage) < amount) {
        topPixel.setColor(Color.White);
      } else {
        topPixel.setColor(Color.GREEN);
      }
    }
  }
  }

This is what I am writing in the interactions panel to invoke the method:

> String fileName = FileChooser.getMediaPath("butterfly1.jpg");
> Picture p = new Picture(fileName);
> p.explore();
> p.edgedetection(10);

these are my errors:

Error: /home/milanomj/Desktop/edgedection.java:1: class, interface, or enum expected
Static Error: No method in Picture with name 'edgedetection' accepts arguments (int)

I have no idea why this isnt working, or rather any of my methods are working.