New to programming

Im trying to write a method here:

Code :

---

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.

well i assume you have made edgeDetection part of the Picture class, and well that error is suggesting that you should be passing a DOUBLE not an INT ;)

Ah no I wasnt in the class for making methods attached to a class.... That would explain why non of my methods are working

how exactly do you do that or do you know of a tutorial of how to do this

Well if Picture is your own class then you can just add the methods into it, it's hard to see exactly what is going on.

Chris

Okay well I dont know if this will help but I am using Dr. Java....


Also is there anyway you could just give any example of how to declare the class for the method?

Code :

---

public class MyClass{
        private int myClassVariables;
 
        public MyClass(){
        } // Constructor
 
        public int myIntReturningFunction(){
               return 2;
       }
}

---

You get the idea