Java.io.PipedInputStream Class

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Introduction

The Java.io.PipedInputStream class is a piped input stream that can be connected to a piped output stream, the piped input stream then provides whatever data bytes are written to the piped output stream.Following are the important points about PipedInputStream −

  • The piped input stream contains a buffer, decoupling read operations from write operations, within limits.

  • Attempting to use both objects from a single thread is not recommended, as it may deadlock the thread.

  • 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.

Class declaration

Following is the declaration for Java.io.PipedInputStream class −

public class PipedInputStream
   extends InputStream

Field

Following are the fields for Java.io.PipedInputStream class −

  • protected byte[] buffer − This is the circular buffer into which incoming data is placed.

  • protected int in − This is the index of the position in the circular buffer at which the next byte of data will be stored when received from the connected piped output stream.

  • protected int out − This is the index of the position in the circular buffer at which the next byte of data will be read by this piped input stream.

  • protected static int PIPE_SIZE − This is the default size of the pipe's circular input buffer.

Class constructors

Sr.No. Constructor & Description
1

PipedInputStream()

This creates a PipedInputStream so that it is not yet connected.
2

PipedInputStream(int pipeSize)

This creates a PipedInputStream so that it is not yet connected and uses the specified pipe size for the pipe's buffer.
3

PipedInputStream(PipedOutputStream src)

This creates a PipedInputStream so that it is connected to the piped output stream src.
4

PipedInputStream(PipedOutputStream src, int pipeSize)

This creates a PipedInputStream so that it is connected to the piped output stream src and uses the specified pipe size for the pipe's buffer.

Class methods

Sr.No. Method & Description
1 int available()

This method returns the number of bytes that can be read from this input stream without blocking.
2 void close()

This method closes this piped input stream and releases any system resources associated with the stream.
3 void connect(PipedOutputStream src)

This method causes this piped input stream to be connected to the piped output stream src.
4 int read()

This method reads the next byte of data from this piped input stream.
5 int read(byte[] b, int off, int len)

This method reads up to len bytes of data from this piped input stream into an array of bytes.
6 protected void receive(int b)

This method receives a byte of data.

Methods inherited

This class inherits methods from the following classes −

  • Java.io.InputStream
  • Java.io.Object
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