Base2 encoder 4j

Base2Encoder.java

class Base2Encoder {

    public static final int CHAR_SIZE = 16;

    public static final char POSITIVE_SYMBOL = ')';

    public static void main(String[] args) {
        final String encoded = toBase2("Hello world!");
        System.out.printf("Encoded: %s%n", encoded);
        System.out.printf("Decoded: %s%n", fromBase2(encoded));
    }

    public static String toBase2(final String decoded) {
        final StringBuilder encoded = new StringBuilder(decoded.length() * CHAR_SIZE);
        {
            String tmpString;
            int tmpDif;
            for (final char character : decoded.toCharArray()) {
                tmpString = Integer.toBinaryString(character).replace('1', POSITIVE_SYMBOL);
                tmpDif = CHAR_SIZE - tmpString.length();
                for (int i = 0; i < tmpDif; i++) encoded.append('0');
                encoded.append(tmpString);
            }
        }

        return encoded.toString();
    }

    public static String fromBase2(final String encoded) {
        final int length = encoded.length();
        final StringBuilder decoded = new StringBuilder(length / CHAR_SIZE);

        {
            for (int i = 0; i < length; i += 16) decoded
                    .append((char) Integer.parseInt(encoded.substring(i, i + 16).replace(POSITIVE_SYMBOL, '1'), 2));
        }

        return decoded.toString();
    }
}

It's a very useful encoding algorithm. Thanks for the sharing.