public class Printer {

        private File file;

        public Printer(String fileName) throws Exception {
            this.file = new File(fileName);
        }

        public void printLinesWhichContain(String word) {
            Scanner reader = new Scanner(this.file);

            while (reader.hasNextLine()) {
                String line = reader.nextLine();
                if (word.equals("")) {
                    System.out.println(line);
                } else if (line.contains(word)) {
                    System.out.println(line);

                }
            }

        }
    }