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JavaTM 2 Platform Std. Ed. v1.3 |
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java.lang.Object
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+--java.io.Reader
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+--java.io.InputStreamReader
An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and translates them into characters according to a specified character encoding. The encoding that it uses may be specified by name, or the platform's default encoding may be accepted.
Each invocation of one of an InputStreamReader's read() methods may cause one or more bytes to be read from the underlying byte-input stream. To enable the efficient conversion of bytes to characters, more bytes may be read ahead from the underlying stream than are necessary to satisfy the current read operation.
For top efficiency, consider wrapping an InputStreamReader within a BufferedReader. For example:
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
BufferedReader,
InputStream,
Character encodings| Fields inherited from class java.io.Reader |
lock |
| Constructor Summary | |
InputStreamReader(InputStream in)
Create an InputStreamReader that uses the default character encoding. |
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InputStreamReader(InputStream in,
String enc)
Create an InputStreamReader that uses the named character encoding. |
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| Method Summary | |
void |
close()
Close the stream. |
String |
getEncoding()
Returns the canonical name of the character encoding being used by this stream. |
int |
read()
Read a single character. |
int |
read(char[] cbuf,
int off,
int len)
Read characters into a portion of an array. |
boolean |
ready()
Tell whether this stream is ready to be read. |
| Methods inherited from class java.io.Reader |
mark, markSupported, read, reset, skip |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public InputStreamReader(InputStream in)
in - An InputStream
public InputStreamReader(InputStream in,
String enc)
throws UnsupportedEncodingException
in - An InputStreamenc - The name of a supported
character
encodingUnsupportedEncodingException - If the named encoding is not supported| Method Detail |
public String getEncoding()
InputStreamReader was created with the
InputStreamReader(InputStream, String) constructor then the
returned encoding name, being canonical, may differ from the encoding
name passed to the constructor. May return null if the
stream has been closed.null if the stream has been closed
public int read()
throws IOException
read in class ReaderIOException - If an I/O error occurs
public int read(char[] cbuf,
int off,
int len)
throws IOException
read in class Readercbuf - Destination bufferoff - Offset at which to start storing characterslen - Maximum number of characters to readIOException - If an I/O error occurs
public boolean ready()
throws IOException
ready in class ReaderIOException - If an I/O error occurs
public void close()
throws IOException
close in class ReaderIOException - If an I/O error occurs
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JavaTM 2 Platform Std. Ed. v1.3 |
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