Appends the specified character sequence to this Appendable.

Depending on which class implements the character sequence csq, the entire sequence may not be appended. For instance, if csq is a java.nio.CharBuffer then the subsequence to append is defined by the buffer's position and limit.

Parameters:

csq

The character sequence to append. If csq is null, then the four characters "null" are appended to this Appendable.

Returns:  A reference to this Appendable

Exceptions:

IOException

If an I/O error occurs