Java中如何区分可恢复条件和编程错误，使用检查异常和运行时异常的方式进行处理？

/**
 * Convert a tag string into a tag map.
 *
 * @param tagString a space-delimited string of key-value pairs. For example, {@code "key1=value1 key_n=value_n"}
 * @return a tag {@link Map}
 * @throws IllegalArgumentException if the tag string is corrupted.
 */
public static Map<String, String> parseTags(final String tagString) throws IllegalArgumentException {
    // delimit by whitespace or '='
    Scanner scanner = new Scanner(tagString).useDelimiter("\s+|=");
 
    Map<String, String> tagMap = new HashMap<String, String>();
    try {
        while (scanner.hasNext()) {
            String tagName = scanner.next();
            String tagValue = scanner.next();
            tagMap.put(tagName, tagValue);
        }
    } catch (NoSuchElementException e) {
        // The tag string is corrupted.
        throw new IllegalArgumentException("Invalid tag string '" + tagString + "'");
    } finally {
        scanner.close();
    }
 
    return tagMap;
}