Java - PipedReader

Last Updated : 17 Mar 2025

The PipedReader class is used to read the contents of a pipe as a stream of characters. This class is used generally to read text.

PipedReader class must be connected to the same PipedWriter and are used by different threads.

Constructor

Constructor	Description
PipedReader(int pipeSize)	It creates a PipedReader so that it is not yet connected and uses the specified pipe size for the pipe's buffer.
PipedReader(PipedWriter src)	It creates a PipedReader so that it is connected to the piped writer src.
PipedReader(PipedWriter src, int pipeSize)	It creates a PipedReader so that it is connected to the piped writer src and uses the specified pipe size for the pipe's buffer.
PipedReader()	It creates a PipedReader so that it is not yet connected.

Method

Modifier and Type	Method	Method
void	close()	It closes this piped stream and releases any system resources associated with the stream.
void	connect(PipedWriter src)	It causes this piped reader to be connected to the piped writer src.
int	read()	It reads the next character of data from this piped stream.
int	read(char[] cbuf, int off, int len)	It reads up to len characters of data from this piped stream into an array of characters.
boolean	ready()	It tells whether this stream is ready to be read.

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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