Java PipedReader Class

Java PipedReader class is used to read character data from a pipe as a stream of characters.

In this chapter, we will learn what the PipedReader class is, why it is used, its declaration, constructors, methods, and examples to understand how it works with PipedWriter for inter-thread communication.

What is PipedReader Class in Java?

The PipedReader class is a character input stream that reads data from a pipe. This data is written to the pipe using a connected PipedWriter.

PipedReader is mainly used for communication between two threads, where one thread writes character data using PipedWriter and another thread reads that data using PipedReader. Both streams must be connected to each other and usually run in different threads.

PipedReader Class Declaration

The PipedReader class is a part of the java.io package and extends the Reader class.

Constructors of PipedReader Class

The PipedReader class provides constructors to create a piped reader that may or may not be connected to a piped writer.

1. PipedReader()

This constructor creates a PipedReader that is not yet connected to any PipedWriter.

Syntax:

Here is the syntax:

2. PipedReader(PipedWriter src)

This constructor creates a PipedReader that is already connected to the specified PipedWriter.

Syntax:

Here is the syntax:

3. PipedReader(int pipeSize)

This constrictor creates a PipedReader that is not yet connected and uses the specified pipe size for the internal buffer.

Syntax:

Here is the syntax:

4. PipedReader(PipedWriter src, int pipeSize)

This constructor creates a PipedReader that is connected to the specified PipedWriter and uses the given pipe size.

Syntax:

Here is the syntax:

Example of PipedReader Class Constructors

The following example demonstrates how to create and connect a PipedReader using different constructors.

Methods of PipedReader Class

The PipedReader class provides the following methods to read characters and manage the pipe connection.

Examples of Java PipedReader Class

Practice the following examples to understand the concept and usages of PipedReader class.

Example 1: Reading Data from a Pipe Using Two Threads

The following example demonstrates how PipedReader reads data written by a PipedWriter using two different threads.

Output:

I love my country

Example 2: Reading Data Using connect() Method

The following example demonstrates how a PipedReader can be connected to a PipedWriter using the connect() method.

Output:

Java PipedReader Example