• For examining strings the StringTokenizer class is useful.
• Handling similar to Enumeration.

public static String replace(String line, String find_key,
	String replace_key)
{
	StringBuffer result = new StringBuffer();

	for (StringTokenizer tokenizer =
		new StringTokenizer(line, " \t\n,.:;\"", true);
		tokenizer.hasMoreElements();  )
	{
		String word = (String) tokenizer.nextElement();

		if (word.equals(find_key))
			result.append(replace_key);
		else
			result.append(word);
	}

	return result.toString();
}

• Can be used to parse strings for numerical values.