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Java Standard Edition (SE)

Writer


compact1, compact2, compact3
java.io

Class Writer

    • 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 Writer()
      Creates a new character-stream writer whose critical sections will synchronize on the writer itself.
      protected Writer(Object lock)
      Creates a new character-stream writer 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

      • Writer

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

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

      • write

        public void write(int c)
                   throws IOException
        Writes a single character. The character to be written is contained in the 16 low-order bits of the given integer value; the 16 high-order bits are ignored.

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

        Parameters:
        c - int specifying a character to be written
        Throws:
        IOException - If an I/O error occurs
      • write

        public void write(char[] cbuf)
                   throws IOException
        Writes an array of characters.
        Parameters:
        cbuf - Array of characters to be written
        Throws:
        IOException - If an I/O error occurs
      • write

        public abstract void write(char[] cbuf,
                                   int off,
                                   int len)
                            throws IOException
        Writes a portion of an array of characters.
        Parameters:
        cbuf - Array of characters
        off - Offset from which to start writing characters
        len - Number of characters to write
        Throws:
        IOException - If an I/O error occurs
      • write

        public void write(String str)
                   throws IOException
        Writes a string.
        Parameters:
        str - String to be written
        Throws:
        IOException - If an I/O error occurs
      • write

        public void write(String str,
                          int off,
                          int len)
                   throws IOException
        Writes a portion of a string.
        Parameters:
        str - A String
        off - Offset from which to start writing characters
        len - Number of characters to write
        Throws:
        IndexOutOfBoundsException - If off is negative, or len is negative, or off+len is negative or greater than the length of the given string
        IOException - If an I/O error occurs
      • append

        public Writer append(CharSequence csq)
                      throws IOException
        Appends the specified character sequence to this writer.

        An invocation of this method of the form out.append(csq) behaves in exactly the same way as the invocation

             out.write(csq.toString()) 

        Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.

        Specified by:
        append in interface Appendable
        Parameters:
        csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this writer.
        Returns:
        This writer
        Throws:
        IOException - If an I/O error occurs
        Since:
        1.5
      • append

        public Writer append(CharSequence csq,
                             int start,
                             int end)
                      throws IOException
        Appends a subsequence of the specified character sequence to this writer. Appendable.

        An invocation of this method of the form out.append(csq, start, end) when csq is not null behaves in exactly the same way as the invocation

             out.write(csq.subSequence(start, end).toString()) 
        Specified by:
        append in interface Appendable
        Parameters:
        csq - The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".
        start - The index of the first character in the subsequence
        end - The index of the character following the last character in the subsequence
        Returns:
        This writer
        Throws:
        IndexOutOfBoundsException - If start or end are negative, start is greater than end, or end is greater than csq.length()
        IOException - If an I/O error occurs
        Since:
        1.5
      • append

        public Writer append(char c)
                      throws IOException
        Appends the specified character to this writer.

        An invocation of this method of the form out.append(c) behaves in exactly the same way as the invocation

             out.write(c) 
        Specified by:
        append in interface Appendable
        Parameters:
        c - The 16-bit character to append
        Returns:
        This writer
        Throws:
        IOException - If an I/O error occurs
        Since:
        1.5
      • flush

        public abstract void flush()
                            throws IOException
        Flushes the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination. Then, if that destination is another character or byte stream, flush it. Thus one flush() invocation will flush all the buffers in a chain of Writers and OutputStreams.

        If the intended destination of this stream is an abstraction provided by the underlying operating system, for example a file, then flushing the stream guarantees only that bytes previously written to the stream are passed to the operating system for writing; it does not guarantee that they are actually written to a physical device such as a disk drive.

        Specified by:
        flush in interface Flushable
        Throws:
        IOException - If an I/O error occurs
      • close

        public abstract void close()
                            throws IOException
        Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. 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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