Java - PipedWriter

Last Updated : 17 Mar 2025

The PipedWriter class is used to write java pipe as a stream of characters. This class is used generally for writing text. Generally PipedWriter is connected to a PipedReader and used by different threads.

Constructor

Constructor	Description
PipedWriter()	It creates a piped writer that is not yet connected to a piped reader.
PipedWriter(PipedReader snk)	It creates a piped writer connected to the specified piped reader.

Method

Modifier and Type	Method	Method
void	close()	It closes this piped output stream and releases any system resources associated with this stream.
void	connect(PipedReader snk)	It connects this piped writer to a receiver.
void	flush()	It flushes this output stream and forces any buffered output characters to be written out.
void	write(char[] cbuf, int off, int len)	It writes len characters from the specified character array starting at offset off to this piped output stream.
void	write(int c)	It writes the specified char to the piped output stream.

Example

import java.io.PipedReader;
import java.io.PipedWriter;

public class PipeReaderExample2 {
	public static void main(String[] args) {
		try {

			final PipedReader read = new PipedReader();
			final PipedWriter write = new PipedWriter(read);

			Thread readerThread = new Thread(new Runnable() {
				public void run() {
					try {
						int data = read.read();
						while (data != -1) {
							System.out.print((char) data);
							data = read.read();
						}
					} catch (Exception ex) {
					}
				}
			});

			Thread writerThread = new Thread(new Runnable() {
				public void run() {
					try {
						write.write("I love my country\n".toCharArray());
					} catch (Exception ex) {
					}
				}
			});

			readerThread.start();
			writerThread.start();

		} catch (Exception ex) {
			System.out.println(ex.getMessage());
		}

	}
}

Output:

I love my country

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