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Java Standard Edition (SE)

Reader


compact1, compact2, compact3
java.io

Class Reader

    • Field Summary

      Fields 
      Modifier and Type Field and Description
      protected Object lock
      The object used to synchronize operations on this stream.
    • Constructor Summary

      Constructors 
      Modifier Constructor and Description
      protected Reader()
      Creates a new character-stream reader whose critical sections will synchronize on the reader itself.
      protected Reader(Object lock)
      Creates a new character-stream reader whose critical sections will synchronize on the given object.
    • Field Detail

      • lock

        protected Object lock
        The object used to synchronize operations on this stream. For efficiency, a character-stream object may use an object other than itself to protect critical sections. A subclass should therefore use the object in this field rather than this or a synchronized method.
    • Constructor Detail

      • Reader

        protected Reader()
        Creates a new character-stream reader whose critical sections will synchronize on the reader itself.
      • Reader

        protected Reader(Object lock)
        Creates a new character-stream reader whose critical sections will synchronize on the given object.
        Parameters:
        lock - The Object to synchronize on.
    • Method Detail

      • read

        public int read(CharBuffer target)
                 throws IOException
        Attempts to read characters into the specified character buffer. The buffer is used as a repository of characters as-is: the only changes made are the results of a put operation. No flipping or rewinding of the buffer is performed.
        Specified by:
        read in interface Readable
        Parameters:
        target - the buffer to read characters into
        Returns:
        The number of characters added to the buffer, or -1 if this source of characters is at its end
        Throws:
        IOException - if an I/O error occurs
        NullPointerException - if target is null
        ReadOnlyBufferException - if target is a read only buffer
        Since:
        1.5
      • read

        public int read()
                 throws IOException
        Reads a single character. This method will block until a character is available, an I/O error occurs, or the end of the stream is reached.

        Subclasses that intend to support efficient single-character input should override this method.

        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
      • read

        public int read(char[] cbuf)
                 throws IOException
        Reads characters into an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.
        Parameters:
        cbuf - Destination buffer
        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
      • read

        public abstract int read(char[] cbuf,
                                 int off,
                                 int len)
                          throws IOException
        Reads characters into a portion of an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.
        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:
        IOException - If an I/O error occurs
      • skip

        public long skip(long n)
                  throws IOException
        Skips characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached.
        Parameters:
        n - The number of characters to skip
        Returns:
        The number of characters actually skipped
        Throws:
        IllegalArgumentException - If n is negative.
        IOException - If an I/O error occurs
      • ready

        public boolean ready()
                      throws IOException
        Tells 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
      • markSupported

        public boolean markSupported()
        Tells whether this stream supports the mark() operation. The default implementation always returns false. Subclasses should override this method.
        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 attempt to reposition the stream to this point. Not all character-input streams support the mark() operation.
        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.
        Throws:
        IOException - If the stream does not support mark(), or if some other I/O error occurs
      • reset

        public void reset()
                   throws IOException
        Resets the stream. If the stream has been marked, then attempt to reposition it at the mark. If the stream has not been marked, then attempt to reset it in some way appropriate to the particular stream, for example by repositioning it to its starting point. Not all character-input streams support the reset() operation, and some support reset() without supporting mark().
        Throws:
        IOException - If the stream has not been marked, or if the mark has been invalidated, or if the stream does not support reset(), or if some other I/O error occurs
      • close

        public abstract void close()
                            throws IOException
        Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.
        Specified by:
        close in interface Closeable
        Specified by:
        close in interface AutoCloseable
        Throws:
        IOException - If an I/O error occurs


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