private enum Parameters {
        input, param, output, num
    }

    String fileIn = null;
String stringNum = null;
    int num = 0;
private static final String GrammarEqual = "=";
    private static final Map<Parameters, String> map;

    static {
        map = new HashMap<>();

        map.put(Parameters.input, "INPUT_FILE");
        map.put(Parameters.param, "INPUT_PARAM");
        map.put(Parameters.output, "OUTPUT_FILE");
        map.put(Parameters.num, "NUM");
    }
private void readConfig(String configFile) throws IOException {
        FileInputStream fin = new FileInputStream(configFile);
        String str;
        String strDelete = "\n"; //Разделение
        byte[] buffer = new byte[fin.available()];
        fin.read(buffer);
        //str = buffer.toString();
        str = new String(buffer);
        str = str.replaceAll(" ", "");
        str = str.replaceAll("\r", "");
        String[] parameters = str.split(strDelete);
        for (String item : parameters) {
            if (item.startsWith(map.get(Parameters.input))) {
                if (fileIn == null) {
                    fileIn = item.substring(map.get(Parameters.input).length(), GrammarEqual.length() + 1);
                    fileIn = fileIn.substring(GrammarEqual.length() + 1);
                }
            }
            if (item.startsWith(map.get(Parameters.num))) {
                if (stringNum == null) {
                    stringNum = item.substring(map.get(Parameters.num).length(), GrammarEqual.length());
                    stringNum = stringNum.substring(GrammarEqual.length());
                    num = Integer.parseInt(stringNum);
                }
            }
        }

        fin.close();
    }