text file을 읽어 array[]로 return해 줌 String[] readLines(String filename) throws IOException { FileReader fileReader = new FileReader(filename); BufferedReader bufferedReader = new BufferedReader(fileReader); List lines = new ArrayList(); String line; while ((line = bufferedReader.readLine()) != null) { line = line.trim(); lines.add(line); } bufferedReader.close(); return lines.toArray(new String[0])..