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Java Writer flush() Method with Example

Writer Class flush() method: Here, we are going to learn about the flush() method of Writer Class with its syntax and example.
Submitted by Preeti Jain, on April 27, 2020

Writer Class flush() method

• flush() method is available in java.io package.
• flush() method is used to flush this Writer stream. When the stream saved any characters from the different write() methods in a buffer and write them to their intended destination immediately then after check if that destination hold another character or byte stream flush it and one flush() call will flush all buffer data in a sequence of Writer and output streams.
• 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 abstract 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 Writer

import java.io.*;

public class FlushOfWriter {
    public static void main(String[] args) throws Exception {
        Writer w_stm = null;
        String str = "Java World!!!";

        try {
            // Instantiates Writer
            w_stm = new PrintWriter(System.out);

            // when we call write() method is to write
            // the string to the stream Writer
            w_stm.write(str);

            // By using flush() method is to
            // write the bytes out immediately
            // to the stream
            w_stm.flush();
            System.out.println();

            System.out.println("Stream flushed");

            // By using close() method is to
            // close the stream
            w_stm.close();
        } catch (Exception ex) {
            System.out.println(ex.toString());
        } finally {
            // with the help of this block is to
            // free all necessary resources linked
            // with the stream
            if (w_stm != null) {
                w_stm.close();
            }
        }
    }
}

Output

Java World!!!
Stream flushed