| java.lang.Object | ||
| ↳ | java.io.Reader | |
| ↳ | java.io.InputStreamReader | |
Class Overview
An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and translates them into characters. 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.
Summary
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 From class
java.io.Reader
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| Public Constructors | |||||||||||
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InputStreamReader(InputStream is)
Create an InputStreamReader that uses the default character encoding.
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InputStreamReader(InputStream is, String enc)
Create an InputStreamReader that uses the named character encoding.
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| void |
close()
Close the stream.
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| void |
mark(int readAheadLimit)
Mark the present position in the stream.
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| boolean |
markSupported()
Tell whether this stream supports the mark() operation.
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| int |
read()
Read a single character.
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| int |
read(char[] cbuf, int off, int len)
Read characters into a portion of an array.
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| boolean |
ready()
Tell whether this stream is ready to be read.
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| void |
reset()
Reset the stream.
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| long |
skip(long n)
Skip characters.
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Inherited Methods | |||||||||||
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From class
java.io.Reader
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From class
java.lang.Object
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Public Constructors
public InputStreamReader (InputStream is)
Create an InputStreamReader that uses the default character encoding.
Parameters
| is | An InputStream |
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public InputStreamReader (InputStream is, String enc)
Create an InputStreamReader that uses the named character encoding.
Parameters
| is | An InputStream |
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| enc | The name of a supported |
Throws
| UnsupportedEncodingException | If the named encoding is not supported |
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Public Methods
public void mark (int readAheadLimit)
Mark the present position in the stream.
Parameters
| readAheadLimit | Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail. |
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Throws
| IOException | If an I/O error occurs |
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public boolean markSupported ()
Tell whether this stream supports the mark() operation.
Returns
- true if and only if this stream supports the mark operation.
public int read ()
Read a single character.
Returns
- The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached
Throws
| IOException | If an I/O error occurs |
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public int read (char[] cbuf, int off, int len)
Read characters into a portion of an array.
Parameters
| cbuf | Destination buffer |
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| off | Offset at which to start storing characters |
| len | Maximum number of characters to read |
Returns
- The number of characters read, or -1 if the end of the stream has been reached
Throws
| IOException | If an I/O error occurs |
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public boolean ready ()
Tell whether this stream is ready to be read.
Returns
- True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.
Throws
| IOException | If an I/O error occurs |
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public long skip (long n)
Skip characters.
Parameters
| n | The number of characters to skip |
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Returns
- The number of characters actually skipped
Throws
| IOException | If an I/O error occurs |
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