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Java StringWriter flush() Method with Example

StringWriter Class flush() method: Here, we are going to learn about the flush() method of StringWriter Class with its syntax and example.
Submitted by Preeti Jain, on April 25, 2020

StringWriter Class flush() method

• flush() method is available in java.io package.
• flush() method is used to flush this StringWriter stream.
• 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 does not throw an exception at the time of flushing the stream.

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 StringWriter

import java.io.*;

public class FlushOfFSW {
    public static void main(String[] args) throws Exception {
        StringWriter str_w = null;
        String str = "Java World!!!";

        try {
            // Instantiates StringWriter
            str_w = new StringWriter();

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

            // when we call write() method 
            // after closing the stream will not
            // result an exception
            str_w.write(str);

            // By using flush() method is to
            // write byte out immediately of any
            // buffered outplut
            str_w.flush();
            System.out.println("str_w.toString(): " + str_w.toString());
            System.out.println("Stream Flushed");
        } 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 (str_w != null) {
                str_w.close();
            }
        }
    }
}

Output

str_w.toString(): Java World!!!
Stream Flushed