How to create and write output of program to a file ?

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Java

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image-processing

hi all,
Iam trying to write the locations of points to afile but it only write "E" i don't know why it just write "E" in my file and didn't write the locations of points ...

for( int i = 0; i < detector.getNumberOfFeatures(); i++ ) {
                    
            	 Point2D_F64 pt = detector.getLocation(i);
                     if( detector.hasScale() ) {
                             double scale = detector.getScale(i);
                             int radius = (int)(scale*          
                             render.addCircle((int)pt.x,(int)pt.y,radius);
                     }
                     else
                     {
                             render.addPoint((int) pt.x, (int) pt.y);
                     }
                //******to write location of point to file*********//
                     try {
                     	
                       File statText = new File("D:/Master/statsTest.txt");
                       FileOutputStream is = new FileOutputStream(statText);
                       OutputStreamWriter osw = new OutputStreamWriter(is);    
                       Writer w = new BufferedWriter(osw);
                     	       
                     	        w.write((int) pt.x);
                     	        w.write((int) pt.y);
                     	        
                     	        w.close();
                     	    } catch (IOException e) {
                   System.err.println("Problem writing to the file statsTest.txt");
                     	    }
                     
             }

or is there any Method i can use to write my output?
Regards