Ова апстрактна класа за писање у токове знакова. Једине методе које поткласа мора имплементирати су врите(цхар[] инт инт) флусх() и цлосе(). Већина поткласа ће, међутим, надјачати неке од метода дефинисаних овде да би се обезбедила додатна функционалност веће ефикасности или обоје. Цонструцтор
заштићени Вритер() :
Креира нови писац карактера чији ће се критички делови синхронизовати на самом писцу.
заштићени Вритер (закључавање објекта):
Креира нови писац токова карактера чији ће се критични делови синхронизовати на датом објекту. Методе:
Додатак за писање (знак ц) :
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)
Syntax : public Writer append(char c) throws IOException Parameters: c - The 16-bit character to append Returns: This writer Throws: IOException
Вритер аппенд (ЦхарСекуенце цск) :
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.
Syntax : public Writer append(CharSequence csq) throws IOException 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
Appends a subsequence of the specified character sequence to this writer.Appends a subsequence of the specified character sequence to this writer
Syntax : public Writer append(CharSequence csq int start int end) throws IOException 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 IOException
апстрактна воид цлосе():
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.
Syntax : public abstract void close() throws IOException Throws: IOException
апстрактна воид флусх() :
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.
Syntax : public abstract void flush() throws IOException Throws: IOException
воид врите(цхар[] цбуф) :
Writes an array of characters.
Syntax : public void write(char[] cbuf) throws IOException Parameters: cbuf - Array of characters to be written Throws: IOException - If an I/O error occurs
Syntax : public abstract void write(char[] cbuf int off int len) throws IOException Parameters: cbuf - Array of characters off - Offset from which to start writing characters len - Number of characters to write Throws: IOException
воид врите(инт ц):
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.
Syntax : public void write(int c) throws IOException Parameters: c - int specifying a character to be written Throws: IOException
воид врите(Стринг стр) :
Writes a string.
Syntax : public void write(String str) throws IOException Parameters: str - String to be written Throws: IOException
воид врите(Стринг стр инт офф инт лен) :
Writes a portion of a string.
Syntax : public void write(String str int off int len) throws IOException Parameters: str - A String off - Offset from which to start writing characters len - Number of characters to write Throws: IndexOutOfBoundsException
Програм: Java
//Java program demonstrating Writer methodsimportjava.io.IOException;importjava.io.PrintWriter;importjava.io.Writer;classWriterDemo{publicstaticvoidmain(String[]args)throwsIOException{Writerwr=newPrintWriter(System.out);charc[]={'B''C''D''E''F'};CharSequencecs='JKL';Stringstr='GHI';//illustrating write(int c)wr.write(65);//flushing the streamwr.flush();//illustrating write(char[] cint offint len)wr.write(c);wr.flush();//illustrating write(String strint offint len)wr.write(str);wr.flush();//illustrating append(Charsequence csint startint end)wr.append(cs);wr.flush();//illustrating append(int ch)wr.append('M');wr.flush();//closing the streamwr.close();}}