public
interface
Readable
Known indirect subclasses
BufferedReader, CharArrayReader, CharBuffer, FileReader, FilterReader, InputStreamReader, LineNumberReader, PipedReader, PushbackReader, Reader, StringReader
| BufferedReader | Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines. |
| CharArrayReader | This class implements a character buffer that can be used as a character-input stream. |
| CharBuffer | A char buffer. |
| FileReader | Reads text from character files using a default buffer size. |
| FilterReader | Abstract class for reading filtered character streams. |
| InputStreamReader |
An InputStreamReader is a bridge from byte streams to character streams: It
reads bytes and decodes them into characters using a specified charset.
|
| LineNumberReader | A buffered character-input stream that keeps track of line numbers. |
| PipedReader | Piped character-input streams. |
| PushbackReader | A character-stream reader that allows characters to be pushed back into the stream. |
| Reader | Abstract class for reading character streams. |
| StringReader | A character stream whose source is a string. |
A Readable is a source of characters. Characters from
a Readable are made available to callers of the read
method via a CharBuffer.
Summary
Public methods | |
|---|---|
abstract
int
|
read(CharBuffer cb)
Attempts to read characters into the specified character buffer. |
Public methods
read
public abstract int read (CharBuffer cb)
Attempts to read characters into the specified character buffer. The buffer is used as a repository of characters as-is: the only changes made are the results of a put operation. No flipping or rewinding of the buffer is performed.
| Parameters | |
|---|---|
cb |
CharBuffer: the buffer to read characters into |
| Returns | |
|---|---|
int |
The number of char values added to the buffer,
or -1 if this source of characters is at its end |
| Throws | |
|---|---|
IOException |
if an I/O error occurs |
NullPointerException |
if cb is null |
ReadOnlyBufferException |
if cb is a read only buffer |