Closeable, Flushable, Appendable, AutoCloseable
BufferedWriter, CharArrayWriter, FilterWriter, OutputStreamWriter, PipedWriter, PrintWriter, StringWriter
Abstract class for writing to character streams. The only methods that a subclass must implement are write(char[], int, int), flush(), and close(). Most subclasses, however, will override some of the methods defined here in order to provide higher efficiency, additional functionality, or both.
Fields
The object used to synchronize operations on this stream.
Constructors
protected
Creates a new character-stream writer whose critical sections will synchronize on the writer itself.
protected
Creates a new character-stream writer whose critical sections will synchronize on the given object.
Appends the specified character to this writer.
Appends the specified character sequence to this writer.
Appends a subsequence of the specified character sequence to this writer.
abstract void
Closes the stream, flushing it first.
abstract void
Returns a new Writer which discards all characters.
void
Writes an array of characters.
abstract void
write(char[] cbuf, int off, int len)
Writes a portion of an array of characters.
void
Writes a single character.
void
void
Writes a portion of a string.
Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitThe 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.
protected Writer()
Creates a new character-stream writer whose critical sections will synchronize on the writer itself.
Creates a new character-stream writer whose critical sections will synchronize on the given object.
lock - Object to synchronize on
()
Returns a new
Writer
which discards all characters. The returned stream is initially open. The stream is closed by calling the
close()
method. Subsequent calls to
close()
have no effect.
While the stream is open, the append(char), append(CharSequence), append(CharSequence, int, int), flush(), write(int), write(char[]), and write(char[], int, int) methods do nothing. After the stream has been closed, these methods all throw IOException.
The object used to synchronize operations on the returned Writer is not specified.
Writer which discards all characters
Subclasses that intend to support efficient single-character output should override this method.
c - int specifying a character to be written
IOException - If an I/O error occurs
Writes an array of characters.
cbuf - Array of characters to be written
IOException - If an I/O error occurs
throws
IOExceptionWrites a portion of an array of characters.
cbuf - Array of characters
off - Offset from which to start writing characters
len - Number of characters to write
IndexOutOfBoundsException - Implementations should throw this exception if off is negative, or len is negative, or off + len is negative or greater than the length of the given array
IOException - If an I/O error occurs
Writes a string.
str - String to be written
IOException - If an I/O error occurs
Writes a portion of a string.
IndexOutOfBoundsException for the indicated conditions; overriding methods may choose to do otherwise.
str - A String
off - Offset from which to start writing characters
len - Number of characters to write
IndexOutOfBoundsException - Implementations should throw this exception 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
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.
append in interface Appendable
csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this writer.
IOException - If an I/O error occurs
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())
append in interface Appendable
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
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
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
append in interface Appendable
c - The 16-bit character to append
IOException - If an I/O error occurs
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.
flush in interface Flushable
IOException - If an I/O error occurs
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.
close in interface AutoCloseable
close in interface Closeable
IOException - If an I/O error occurs
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