Java.io.FilterOutputStream.flush() Method

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Description

The java.io.FilterOutputStream.flush() method flushes this output stream and forces any buffered contents to be written out to the stream.

Declaration

Following is the declaration for java.io.FilterOutputStream.flush() method −

public void flush()

Parameters

NA

Return Value

This method does not return any value.

Exception

IOException − If an I/O error occurs.

Example

The following example shows the usage of java.io.FilterOutputStream.flush() method.

package com.tutorialspoint;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class FilterOutputStreamDemo {
   public static void main(String[] args) throws Exception {
      OutputStream os = null; 
      FilterOutputStream fos = null;
      FileInputStream fis = null;
      int i = 0;
      char c;
      
      try {
         // create output streams
         os = new FileOutputStream("C://test.txt");
         fos = new FilterOutputStream(os);

         // writes byte to the output stream
         fos.write(65);
                  
         // forces byte contents to written out to the stream
         fos.flush();
         
         // create output streams
         fis = new FileInputStream("C://test.txt");
         
         // read byte
         i=fis.read();
         
         // convert integer to characters
         c = (char)i;
         
         // prints
         System.out.print("Character read: "+ c);
         
      } catch(IOException e) {
         // if any I/O error occurs
         System.out.print("Close() is invoked prior to write()");
      } finally {
         // releases any system resources associated with the stream
         if(os!=null)
            os.close();
         if(fos!=null)
            fos.close();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

Close() is invoked prior to write()