//File f = new File ("filename.txt");
by:  Jia Tse
www.egr.unlv.edu/~jjtse

	private void writeToFile() throws Exception{		
		System.out.println("writing points to file...");
		BufferedWriter out = new BufferedWriter(new FileWriter(f));
		out.write(Integer.toString(numOfPoints));
		out.newLine();
		for (int i=0; i<numOfPoints; i++){
			out.write(Integer.toString(x[i]) + "  ");
		}
		out.newLine();
		for (int i=0; i<numOfPoints; i++){
			out.write(Integer.toString(y[i]) + "  ");	
		}
        out.close();
	}