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java.io
Class StringReader
java.lang.Object
java.io.Reader
java.io.StringReader
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All Implemented Interfaces:
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Closeable
,
Readable
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public class
StringReader
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extends
Reader
A character stream whose source is a string.
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Since:
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JDK1.1
Method Summary
|
void |
close
()
Close the stream. |
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)
Skips the specified number of characters in the stream.
Skip characters.
|
Methods inherited from class java.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
|
StringReader
public StringReader(String s)
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Create a new string reader.
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Parameters:
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s - String providing the character stream.
read
public int read()
throws IOException
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Read a single character.
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Overrides:
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read
in class
Reader
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Returns:
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The character read, or -1 if the end of the stream has been reached
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Throws:
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IOException
- If an I/O error occurs
read
public int read(char[] cbuf,
int off,
int len)
throws IOException
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Read characters into a portion of an array.
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-
Specified by:
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read
in class
Reader
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Parameters:
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cbuf - Destination buffer
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off - Offset at which to start writing characters
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len - Maximum number of characters to read
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Returns:
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The number of characters read, or -1 if the end of the stream has been reached
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Throws:
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IOException
- If an I/O error occurs
skip
public long skip(long ns)
throws IOException
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Skips the specified number of characters in the stream. Returns the number of characters that were skipped.
Skip characters.
The ns parameter may be negative, even though the the skip method of the
Reader
superclass throws an exception in this case. Negative values of ns cause the stream to skip backwards. Negative return values indicate a skip backwards. It is not possible to skip backwards past the beginning of the string.
If the entire string has been read or skipped, then this method has no effect and always returns 0.
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Overrides:
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skip
in class
Reader
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Parameters:
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ns - The number of characters to skip
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Returns:
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The number of characters actually skipped
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Throws:
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IOException
- If an I/O error occurs
ready
public boolean ready()
throws IOException
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Tell whether this stream is ready to be read.
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Overrides:
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ready
in class
Reader
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Returns:
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True if the next read() is guaranteed not to block for input
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Throws:
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IOException
- If the stream is closed
markSupported
public boolean markSupported()
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Tell whether this stream supports the mark() operation, which it does.
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Overrides:
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markSupported
in class
Reader
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Returns:
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true if and only if this stream supports the mark operation.
mark
public void mark(int readAheadLimit)
throws IOException
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Mark the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.
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Overrides:
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mark
in class
Reader
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Parameters:
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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.
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Throws:
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IllegalArgumentException
- If readAheadLimit is < 0
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IOException
- If an I/O error occurs
reset
public void reset()
throws IOException
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Reset the stream to the most recent mark, or to the beginning of the string if it has never been marked.
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Overrides:
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reset
in class
Reader
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Throws:
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IOException
- If an I/O error occurs
close
public void close()
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Close the stream.
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Specified by:
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close
in interface
Closeable
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Specified by:
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close
in class
Reader
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