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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/StringReader.html below:

StringReader (Java SE 21 & JDK 21)

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

A character stream whose source is a string.

Since:

1.1

• Field Summary
• Constructor Summary

  Constructors

  Creates a new string reader.

• Method Summary

  void

  Closes the stream and releases any system resources associated with it.

  void

  Marks the present position in the stream.

  boolean

  Tells whether this stream supports the mark() operation, which it does.

  int

  Reads a single character.

  int

  read(char[] cbuf, int off, int len)

  Reads characters into a portion of an array.

  boolean

  Tells whether this stream is ready to be read.

  void

  Resets the stream to the most recent mark, or to the beginning of the string if it has never been marked.

  long

  Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Details
  • StringReader

    Creates a new string reader.

    Parameters:

    s - String providing the character stream.

• Method Details
  • read

    Reads a single character.

    Overrides:

    read in class Reader

    Returns:

    The character read, or -1 if the end of the stream has been reached

    Throws:

    IOException - If an I/O error occurs

  • read public int read(char[] cbuf, int off, int len)

    throws

    IOException

    If len is zero, then no characters are read and 0 is returned; otherwise, there is an attempt to read at least one character. If no character is available because the stream is at its end, the value -1 is returned; otherwise, at least one character is read and stored into cbuf.

    Specified by:

    read in class Reader

    Parameters:

    cbuf - Destination buffer

    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:

    IndexOutOfBoundsException - If off is negative, or len is negative, or len is greater than cbuf.length - off

    IOException - If an I/O error occurs

  • skip

    Skips characters. If the stream is already at its end before this method is invoked, then no characters are skipped and zero is returned.

    The n parameter may be negative, even though the skip method of the Reader superclass throws an exception in this case. Negative values of n 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.

    Overrides:

    skip in class Reader

    Parameters:

    n - The number of characters to skip

    Returns:

    The number of characters actually skipped

    Throws:

    IOException - If an I/O error occurs

  • ready

    Tells whether this stream is ready to be read.

    Overrides:

    ready in class Reader

    Returns:

    True if the next read() is guaranteed not to block for input

    Throws:

    IOException - If the stream is closed

  • markSupported

    public boolean markSupported()

    Tells whether this stream supports the mark() operation, which it does.

    Overrides:

    markSupported in class Reader

    Returns:

    true if and only if this stream supports the mark operation.

  • mark public void mark(int readAheadLimit)

    throws

    IOException

    Marks the present position in the stream. Subsequent calls to reset() will reposition the stream to this point.

    Overrides:

    mark in class Reader

    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 < 0

    IOException - If an I/O error occurs

  • reset

    Resets the stream to the most recent mark, or to the beginning of the string if it has never been marked.

    Overrides:

    reset in class Reader

    Throws:

    IOException - If an I/O error occurs

  • close

    public void close()

    Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), or reset() invocations will throw an IOException. Closing a previously closed stream has no effect. This method will block while there is another thread blocking on the reader.

    Specified by:

    close in interface AutoCloseable

    Specified by:

    close in interface Closeable

    Specified by:

    close in class Reader

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