StringBuffer.deleteCharAt(int) does not support supplementary characters nor should it, according to ###@###.###. However, the documentation does not clarify this point, so a user may automatically assume that:

abc\uD800\uDC00xyz

and doing a statement like:

StringBuffer.deleteCharAt(3) would produce "abcxyz" if this method respected supplementary characters. This is not the case. The current implementation would produce "abc\uDC00xyz" which is the correct behavior. Therefore, the documentation for this method needs to specify this so that users do not assume that this method does support supplementary characters.

###@###.### 2003-10-17