public String showDiffLine(String l1, String l2) {
		int max = Math.max(l1.length(), l2.length());
		char d[] = new char[max];

		for (int i = 0; i < max; i++) {
			if ((i >= l1.length()) || (i >= l2.length())) d[i] = '|';
			else if (l1.charAt(i) != l2.charAt(i)) d[i] = '|';
			else {
				if (l1.charAt(i) == '\t') d[i] = '\t';
				else d[i] = ' ';
			}
		}

		return new String(d);
	}