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Java.io.FilterReader class in Java - GeeksforGeeks

Last Updated : 12 Sep, 2023

Abstract class for reading filtered character streams. The abstract class FilterReader itself provides default methods that pass all requests to the contained stream. Subclasses of FilterReader should override some of these methods and may also provide additional methods and fields.

• 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

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