In Java, the PipedWriter class is used for writing data to a connected PipedReader. It is a convenient way to implement communication between two threads within the same process or between different processes.

Usage

To use PipedWriter, you need to follow these steps:

1. Create an instance of PipedWriter by passing a PipedReader as a parameter to the constructor.

    PipedWriter writer = new PipedWriter(new PipedReader());
   

2. Write data to the PipedWriter using the write() method.

    writer.write("Hello, PipedWriter!");
   

3. Close the PipedWriter to ensure that all the data is flushed and any resources are released.

    writer.close();
   

Example

Here’s an example that demonstrates the usage of PipedWriter in Java:

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

public class PipedWriterExample {

    public static void main(String[] args) {
        try {
            // Creating PipedReader and PipedWriter
            PipedReader reader = new PipedReader();
            PipedWriter writer = new PipedWriter(reader);

            // Creating a thread to read from PipedReader
            Thread readerThread = new Thread(() -> {
                try {
                    int data;
                    while ((data = reader.read()) != -1) {
                        System.out.print((char) data);
                    }
                    reader.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });

            // Start the reader thread
            readerThread.start();

            // Writing data to PipedWriter
            writer.write("Hello, PipedWriter!");

            // Close the PipedWriter
            writer.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

In this example, a PipedReader is connected to a PipedWriter. The PipedWriter writes the string “Hello, PipedWriter!” and the PipedReader reads and prints the data. Finally, both the PipedWriter and PipedReader are closed.

Conclusion

The PipedWriter and PipedReader classes provide a simple way to implement communication between threads using pipes. It is important to note that these classes should be used within a single process or within processes that are connected through an interprocess communication mechanism.

#java #pipedwriter