Java.io.FilterReader class in Java

• protected FilterReader(Reader in) : Creates a new filtered reader.

• void close() : 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.

  Syntax :public void close() throws IOException Throws: IOException

• void mark(int readAheadLimit) : Marks the present position in the stream.

  Syntax :public void mark(int readAheadLimit) throws IOException 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

• boolean markSupported() : Tells whether this stream supports the mark() operation.

  Syntax :public boolean markSupported() Returns: true if and only if this stream supports the mark operation.

• int read() : Reads a single character.

  Syntax :public int read() throws IOException 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

• int read(char[] cbuf, int off, int len) : Reads characters into a portion of an array.

  Syntax :public int read(char[] cbuf, int off, int len) throws IOException 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

• boolean ready() : Tells whether this stream is ready to be read.

  Syntax :public boolean ready() throws IOException 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

• void reset() : Resets the stream.

  Syntax :public void reset() throws IOException Throws: IOException

• long skip(long n) : Skips characters.

  Syntax :public long skip(long n) throws IOException Parameters: n - The number of characters to skip Returns: The number of characters actually skipped Throws: IOException

//Java program illustrating FilterReader class methods import java.io.*; class FilterReaderdemo {  public static void main(String[] args) throws IOException  {  Reader r = new StringReader("GeeksforGeeks");  FilterReader fr = new FilterReader(r)   {  };  char ch[] = new char[8];    //illustrating markSupported()  if(fr.markSupported())  {  //illustrating mark() method  System.out.println("mark method is supported");  fr.mark(100);  }    //illustrating skip() method  fr.skip(5);    //illustrating ready()  if(fr.ready())  {  //illustrating read(char[] cbuff,int off,int len)  fr.read(ch);  for (int i = 0; i < 8; i++)   {  System.out.print(ch[i]);  }    //illustrating reset()  fr.reset();  for (int i = 0; i <5 ; i++)  {  //illustrating read()  System.out.print((char)fr.read());  }  }    //closing the stream  fr.close();  } } 

mark method is supported forGeeksGeeks