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Java FilterWriter flush() Method with Example

FilterWriter Class flush() method: Here, we are going to learn about the flush() method of FilterWriter Class with its syntax and example.
Submitted by Preeti Jain, on April 03, 2020

FilterWriter Class flush() method

• flush() method is available in java.io package.
• flush() method is used to flush out the string from this FilterWriter 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 may throw an exception at the time of flushing the stream.
  IOException: This exception may throw when getting any input/output error.

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 FilterWriter

import java.io.*;

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

  try {
   // Instantiates StringReader and 
   // FilterReader
   w_stm = new StringWriter();
   fw_stm = new FilterWriter(w_stm) {};

   // By using write() method is to
   // write the given string to the
   // stream fw_stm
   fw_stm.write(str);

   // By using flush() method is to
   // flush the stream fw_stm
   fw_stm.flush();
   System.out.println("w_stm.toString(): " + w_stm.toString());

  } 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 (fw_stm != null) {
    fw_stm.close();
   }
  }
 }
}

Output

w_stm.toString(): Java World!!!