java.io
Class StringReader
java.lang.Object
|
+--java.io.Reader
|
+--java.io.StringReader
- public class StringReader
- extends Reader
A character stream whose source is a string.
- Since:
- JDK1.1
Method Summary |
void |
close()
Close the stream. |
private void |
ensureOpen()
Check to make sure that the stream has not been closed |
void |
mark(int readAheadLimit)
Mark the present position in the stream. |
boolean |
markSupported()
Tell whether this stream supports the mark() operation, which it does. |
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. |
void |
reset()
Reset the stream to the most recent mark, or to the beginning of the
string if it has never been marked. |
long |
skip(long ns)
Skip characters. |
Methods inherited from class java.lang.Object |
,
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
registerNatives,
toString,
wait,
wait,
wait |
str
private String str
length
private int length
next
private int next
mark
private int mark
StringReader
public StringReader(String s)
- Create a new string reader.
ensureOpen
private void ensureOpen()
throws IOException
- Check to make sure that the stream has not been closed
read
public int read()
throws IOException
- Read a single character.
- Returns:
- The character read, or -1 if the end of the stream has been
reached
- Throws:
- IOException - If an I/O error occurs
- Overrides:
- read in class Reader
read
public int read(char[] cbuf,
int off,
int len)
throws IOException
- Read characters into a portion of an array.
- Parameters:
cbuf
- Destination bufferoff
- Offset at which to start writing characterslen
- 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
- Overrides:
- read in class Reader
skip
public long skip(long ns)
throws IOException
- Skip characters.
- Throws:
- IOException - If an I/O error occurs
- Overrides:
- skip in class Reader
ready
public boolean ready()
throws IOException
- Tell whether this stream is ready to be read.
- Returns:
- True if the next read() is guaranteed not to block for input
- Throws:
- IOException - If the stream is closed
- Overrides:
- ready in class Reader
markSupported
public boolean markSupported()
- Tell whether this stream supports the mark() operation, which it does.
- Overrides:
- markSupported in class Reader
mark
public void mark(int readAheadLimit)
throws IOException
- Mark the present position in the stream. Subsequent calls to reset()
will reposition the stream to this point.
- Parameters:
readAheadLimit
- Limit on the number of characters that may be
read while still preserving the mark. Because
the stream's input comes from a string, there
is no actual limit, so this argument must not
be negative, but is otherwise ignored.- Throws:
- IllegalArgumentException - If readAheadLimit is < 0
- IOException - If an I/O error occurs
- Overrides:
- mark in class Reader
reset
public void reset()
throws IOException
- Reset the stream to the most recent mark, or to the beginning of the
string if it has never been marked.
- Throws:
- IOException - If an I/O error occurs
- Overrides:
- reset in class Reader
close
public void close()
- Close the stream.
- Overrides:
- close in class Reader