public static String changeCase(String s) {
		byte b[] = s.getBytes();
		for (int i = 0; i < b.length; i++) {
			if ((b[i] >= 65) && (b[i] <= 90)) {
				b[i] = (byte) (b[i] + 32);
			}
			else if ((b[i] >= 97) && (b[i] <= 122)) {
				b[i] = (byte) (b[i] - 32);
			}
		}
		s = new String(b);
		return s;
	}