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Java.io.PipedWriter Class in Java
  • Last Updated : 23 Jan, 2017

io.PipedWriter Class in Java

This class is basically a piped character-output streams. In I/O Piped, simply means a link between two threads running in JVM at the same time. So, Pipes are used both as source or destination.
A pipe is said to be broken if a thread that was providing data bytes to the connected piped output stream is no longer alive.

Declaration:

public class PipedWriter
  extends Writer

Constructor :

  • PipedWriter() : creates a PipedWriter, that it is not connected.
  • PipedWriter(PipedReader inStream) : creates a PipedWriter, that it is connected to PipedReader – ‘inStream’.

Methods:



  • write(int char) : java.io.PipedWriter.write(int char) writes specified character to the PipedWriter.
    Syntax :
    public void write(int char)
    Parameters : 
    char : character to be written
    Return :                                               
    void
    Exception :
    -> IOException : if in case IO error occurs.
  • write(char[] carray, int offset, int maxlen) : java.io.PipedWriter.write(char[] carray, int offset, int maxlen) writes maxlen character from ‘carray’ to the PipedWriter. The method blocks if no characters are left to be written to the Stream.
    Syntax :
    public void write(char[] carray, int offset, int maxlen)
    Parameters : 
    carray : data of the carray
    offset : starting in the destination array - 'carray'.
    maxlen : maximum length of array to be read
    Return :                                               
    void
    Exception :
    -> IOException : if in case IO error occurs.

    Implementation :




    // Java program illustrating the working of PipedWriter
    // write(char[] carray, int offset, int maxlen)
      
    import java.io.*;
    public class NewClass
    {
        public static void main(String[] args) throws IOException
        {
            PipedReader geek_reader = new PipedReader();
            PipedWriter geek_writer = new PipedWriter();
      
            // Use of connect() : connecting geek_reader with geek_writer
            geek_reader.connect(geek_writer);
      
            char[] carray = {'J', 'A', 'V', 'A'};
      
            // Use of write(char[] carray, int offset, int maxlen)
            geek_writer.write(carray, 0, 4);
            int a = 5;
            System.out.print("Use of write(carray, offset, maxlen) : ");
            while(a>0)
            {
                System.out.print(" " + (char) geek_reader.read());          
            }
            
        }
    }

    Output :

    Use of write(carray, offset, maxlen) :  J A V A
  • close() : java.io.PipedWriter.close() closes the PipedWriter and releases the allocated resources.
    Syntax :
    public void close()
    Parameters : 
    --------------
    Return :                                               
    void
    Exception :
    -> IOException : if in case IO error occurs.
  • connect(PipedReader destination) : java.io.PipedWriter.connect(PipedReader destination) connects the PipedWriter to the ‘destination’ PipedReader and in case ‘destination’ is pipes with some other stream, IO exception is thrown
    Syntax :
    public void connect(PipedReader destination)
    Parameters : 
    destination : the PipedReader to be connected to
    Return :                                               
    void
    Exception :
    -> IOException : if in case IO error occurs.
  • flush() : java.io.PipedWriter.flush() flushes the Output Stream.
    Syntax :
    public void flush()
    Parameters : 
    ------------
    Return :                                               
    void
    Exception :
    -> IOException : if in case IO error occurs.

    Java code illustrating the working of PipedWriter class methods :




    // Java program illustrating the working of PipedWriter
    // write(), connect
    // close(), flush()
      
    import java.io.*;
    public class NewClass
    {
        public static void main(String[] args) throws IOException
        {
            PipedReader geek_reader = new PipedReader();
            PipedWriter geek_writer = new PipedWriter();
            try
            {
                // Use of connect() : connecting geek_reader with geek_writer
                geek_reader.connect(geek_writer);
      
                // Use of write(int byte) :
                geek_writer.write(71);
                geek_writer.write(69);
                geek_writer.write(69);
                geek_writer.write(75);
                geek_writer.write(83);
      
                // Use of flush() method :
                geek_writer.flush();
                System.out.println("Use of flush() method : ");
      
                int i = 5;
                while(i > 0)
                {
                    System.out.print(" " + (char) geek_reader.read());
                    i--;
                }
      
                // USe of close() method :
                System.out.println("\nClosing the Writer stream");
                geek_writer.close();
      
            }
            catch (IOException excpt)
            {
                excpt.printStackTrace();
            }
        }
    }

    Output :

    Use of flush() method : 
     G E E K S
    Closing the Writer stream

    Next Article: Java.io.PipedReader Class in Java

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