compareTo

Compare two strings lexicographically.

Example:

    assert (Strings.compareTo ("abc", "abd") < 0);
    assert (Strings.compareTo ("abc", "abc") == 0);
    assert (Strings.compareTo ("abd", "abc") > 0);

Parameters:

a	first string.
b	second string.

Returns:

negative if a < b, 0 if equal, positive if a > b.