private LinkedList<String> changeDetect(String file) {		
        FileInputStream fis = null;
		InputStreamReader isr = null;
		BufferedReader br = null;
		LinkedList<String> res = null;
		try {
			fis = new FileInputStream(file);
			isr = new InputStreamReader(fis);
			br = new BufferedReader(isr);
			res = new LinkedList<String>();
			String aLine;
			while((aLine = br.readLine()) != null) {				
				String[] hostFile = file.split("\\.dat");
				String[] words = aLine.split(" ");
				if(words.length == 2) {					
					res.add(hostFile[0] + "-" + words[0] + " " + Double.parseDouble(words[1]));
				}
			}
		}
		catch(FileNotFoundException ex) {
			 System.err.println("Could not find text file.");
		}
		catch(IOException e) {
			System.err.println(e);
		}
		finally {
            try {
                br.close();
				isr.close();
                fis.close();
            } 
			catch(IOException ex) {
				System.out.println(ex);
            }
        }
		
        return res;
    }