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Java PipedWriter flush() Method with Example

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

PipedWriter Class flush() method

• flush() method is available in java.io package.
• flush() method is used to flush this PipedWriter stream and forces characters to be written out of any buffered output.
• flush() 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.
• flush() method may throw an exception at the time of flushing the stream.
  IOException: This exception may throw when getting any input/output error while performing.

Syntax:

    public void flush();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void flush() method of PipedWriter

import java.io.*;

public class FlushOfPW {
    public static void main(String[] args) throws Exception {
        int val = 65;
        
        try {
            // Instantiates PipedReader and PipedWriter
            PipedWriter pipe_w = new PipedWriter();
            PipedReader pipe_r = new PipedReader();

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

            // By using flush() method is to flush
            // bytes out to the stream of any buffered
            // output
            pipe_w.flush();

            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_r.read();
                System.out.println("pipe_r.read(): " + ch);
            }
            
            // By using close() method is to close
            // the stream
            pipe_w.close();
            pipe_w.close();
        } catch (Exception ex) {
            System.out.println(ex.toString());
        }
    }
}

Output

pipe_r.read(): A
pipe_r.read(): B
pipe_r.read(): C