java.io.FilterInputStream Class in Java

Java.io.FilterOutputStream class is the superclass of all those classes which filters output streams. The write() method of FilterOutputStream Class filters the data and write it to the underlying stream, filtering which is done depending on the Streams.

Declaration :

public class FilterOutputStream
   extends OutputStream

Constructors :

• FilterOutputStream(OutputStream geekout) : Creates an output stream filter.

Methods:

• write(int arg) : java.io.FilterOutputStream.write(int arg) writes specified byte to the Output stream.
  Syntax :

  public void write(int arg)
  Parameters : 
  arg : Source Bytes
  Return  :
  void
  Exception : 
  In case any I/O error occurs.
  

  Implementation :

  
  

  
  
  

  // Java program illustrating the working of work(int arg) // method import java.io.*; import java.lang.*;    public class NewClass {     public static void main(String[] args) throws IOException     {         // OutputStream, FileInputStream & FilterOutputStream         // initailly null         OutputStream geek_out = null;         FilterOutputStream geek_filter = null;            // FileInputStream used here         FileInputStream geekinput = null;            char c;         int a;         try         {             // create output streams             geek_out = new FileOutputStream("GEEKS.txt");             geek_filter = new FilterOutputStream(geek_out);                // write(int arg) : Used to write 'M' in the file             // - "ABC.txt"             geek_filter.write(77);                // Flushes the Output Stream             geek_filter.flush();                // Creating Input Sream             geekinput = new FileInputStream("GEEKS.txt");                // read() method of FileInputStream :             // readind the bytes and converting next bytes to int             a = geekinput.read();                /* Since, read() converts bytes to int, so we                convert int to char for our program output*/             c = (char)a;                // print character             System.out.println("Character written by" +                               " FilterOutputStream : " + c);            }         catch(IOException excpt)         {             // if any I/O error occurs             System.out.print("Write Not working properly");         }         finally{                // releases any system resources associated with             // the stream             if (geek_out != null)                 geek_out.close();             if (geek_filter != null)                 geek_filter.close();         }     } }

  Note :
  In the program I have used GEEKS.txt file, the program will create a new file of the name given in the code and write in it.
  Output :

  Character written by FilterOutputStream : M

• write(byte[] buffer) : java.io.FilterOutputStream.write(byte[] buffer) writes ‘arg.length’ byte to the Output stream.
  Syntax :

  public void write(byte[] arg)
  Parameters : 
  buffer : Source Buffer to be written to the Output Stream
  Return  :
  void
  Exception : 
  In case any I/O error occurs.
  

  Implementation :

  
  

  
  
  

  // Java program illustrating the working of work(byte // buffer) method import java.io.*; import java.lang.*;    public class NewClass {     public static void main(String[] args) throws IOException     {         // OutputStream, FileInputStream & FilterOutputStream         // initailly null         OutputStream geek_out = null;         FilterOutputStream geek_filter = null;            // FileInputStream used here         FileInputStream geekinput = null;            byte[] buffer = {77, 79, 72, 73, 84};         char c;         int a;         try         {          // create output streams          geek_out = new FileOutputStream("ABC.txt");          geek_filter = new FilterOutputStream(geek_out);             // writes buffer to the output stream          geek_filter.write(buffer);             // forces byte contents to written out to the stream          geek_filter.flush();             // create input streams          geekinput = new FileInputStream("ABC.txt");             while ((a=geekinput.read())!=-1)          {             // converts integer to the character             c = (char)a;                // prints             System.out.print(c);          }         }         catch(IOException excpt)         {             // if any I/O error occurs             System.out.print("Write Not working properly");         }         finally         {             // releases any system resources associated             // with the stream             if (geek_out != null)                 geek_out.close();             if (geek_filter != null)                 geek_filter.close();         }     } }

  Note :
  In the program I have use GEEKS.txt file, the program will create a new file of the name given in the code and write in it.

  Output :

  
  
  
  

  MOHIT

• write(byte[] buffer, int offset, int maxlen) : java.io.FilterOutputStream.write(byte[] buffer, int offset, int maxlen) writes maxlen bytes from the specified Buffer starting at offset position to the Output stream.
  Syntax :

  public void write(write(byte[] buffer, int offset, int maxlen)
  Parameters : 
  buufer : Source Buffer to be written to the Output Stream
  Return  :
  buffer : Source Buffer to be written
  offset : Starting offset 
  maxlen : max no. of bytes to bewriten to the Output Stream
  Exception : 
  In case any I/O error occurs.
  

• flush() : java.io.FilterOutputStream.flush() flushes the Output Stream and no data is allowed to be written to the Stream.
  Syntax :

  public void flush()
  Parameters : 
  ------
  Return  :
  void
  Exception : 
  In case any I/O error occurs.
  

• close() : java.io.FilterOutputStream.close() closes the stream and releases all allocated resources to the Stream.
  Syntax :

  public void close()
  Parameters : 
  ------
  Return  :
  void
  Exception : 
  In case any I/O error occurs.
  

Java program illustrating : write(byte[] buffer, int offset, int maxlen), flush(), close() methods

Note :
In the program I have use GEEKS.txt file, the program will create a new file of the name given in the code and write in it.

Output :

MOHIT

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