Java: Reading String from a File (See related posts)

    try {
        File f = new File("pattern.txt");
        FileReader rd = new FileReader(f);
        char[] buf = new char[(int)f.length()];
        rd.read(buf);
        patternStr = new String(buf);
    
        matcher = pattern.matcher(inputStr);
        matchFound = matcher.matches();
    } catch (IOException e) {
    }