public class String2Hex {

	private static String convertStringToHex(String s) {
		if (s.length() == 0)
			return "";
		char c;
		StringBuffer buff = new StringBuffer();
		for (int i = 0; i < s.length(); i++) {
			c = s.charAt(i);
			buff.append(Integer.toHexString(c) + " ");
		}
		return buff.toString().trim();
	}

	private static String convertHexToString(String s) {
		if (s.length() == 0)
			return "";
		String[] arr = s.split(" ");
		StringBuffer buff = new StringBuffer();
		int i;
		for (String str : arr) {
			i = Integer.valueOf(str, 16).intValue();
			String hs = new Character((char) i).toString();
			buff.append(hs);
		}
		return buff.toString();
	}

	public static void main(String[] args) {
		String s = "Javabeginners";
		String hexStr = String2Hex.convertStringToHex(s);
		System.out.println(hexStr);
		String str = convertHexToString(hexStr);
		System.out.println(str);
	}
}