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Java PipedInputStream available() Method with Example

PipedInputStream Class available() method: Here, we are going to learn about the available() method of PipedInputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 17, 2020

PipedInputStream Class available() method

• available() method is available in java.io package.
• available() method is used to return the number of available bytes left that can be read from this PipedInputStream without blocking.
• available() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• available() method may throw an exception at the time of returning the available bytes left.
  IOException: This exception may throw when getting any input/output error while performing.

Syntax:

    public int available();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is int, it returns the number of available bytes that can be read without blocking as it may return 0 when this stream closed by using the close() method.

Example:

// Java program to demonstrate the example 
// of int available() method 
// of PipedInputStream

import java.io.*;

public class AvailableOfPIS {
    public static void main(String[] args) throws Exception {
        int val = 65;
        try {
            // Instantiates PipedInputStream and 
            // PipedOutputStream
            PipedInputStream pipe_in = new PipedInputStream();
            PipedOutputStream pipe_out = new PipedOutputStream();

            // By using connect() method is to connect
            // this pipe_in to the given pipe_out
            pipe_in.connect(pipe_out);

            for (int i = 0; i < 3; ++i) {
                // By using write() method is to
                // write the val to the stream pipe_out
                pipe_out.write(val);
                val++;
            }

            // By using available() method is to return
            // the available bytes to be read
            int avail_bytes = pipe_in.available();
            System.out.println("pipe_in.available(): " + avail_bytes);
            for (int i = 0; i < 3; ++i) {
                // By using read() method is to
                // read the integer and convert it into
                // char
                char ch = (char) pipe_in.read();
                System.out.println("pipe_in.read(): " + ch);
            }

            // By using close() method is to close
            // the stream
            pipe_in.close();
            pipe_out.close();

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

Output

pipe_in.available(): 3
pipe_in.read(): A
pipe_in.read(): B
pipe_in.read(): C