This is the basic interface to read data from a stream.
Description
Interface to read strings from a stream.
This interfaces 許すs to read strings seperated by
delimiters and to read lines. The character encoding
to be used can be 始める，決める by setEncoding().
Default encoding is "utf8".
reads text until a line break (CR, LF, or CR/LF) or
EOF is 設立する and returns it as string (without CR, LF).
The read characters are 変えるd によれば the
encoding defined by setEncoding. If
EOF is already reached before calling this method
an empty string is returned.
reads text until one of the given delimiter characters
or EOF is 設立する and returns it as string (without delimiter).
Important: CR/LF is not used as default
delimiter! So if no delimiter is defined or 非，不，無 of the
delimiters is 設立する, the stream will be read to EOF. The
read characters are 変えるd によれば the encoding
defined by setEncoding. If EOF is already
reached before calling this method an empty string is returned.
This method has to be used to （悪事，秘密などを）発見する if the end
of the stream is reached.
Important:
This cannot be （悪事，秘密などを）発見するd by asking for an empty string
because that can be a valid return value of
readLine() (if the line is empty) and
readString() (if a delimiter is 直接／まっすぐに followed
by the next one).
Returns
true, if the end of とじ込み／提出する is reached, so that
no next string can be read. 誤った さもなければ
始める，決めるs the character encoding that should be used.
The character encoding 指名するs 言及する to the 文書
http://www.iana.org/assignments/character-始める，決めるs.
Which character 始める，決めるs are supported depends on
the 実施.
