Java OutputStream flush() Method

The flush() method of OutputStream class is used to flush the content of the buffer to the output stream. A buffer is a portion in memory that is used to store a stream of data(characters). That data sometimes will only get sent to an output device, when the buffer is full.

The flush method of OutputStream does nothing.

Syntax

Specified By:

flush in interface Flushable

Throws:

IOException- If an I/O error occurs.

Example

import java.io.*;
public class Test {
   public static void main(String[] args) {
      try {
         OutputStream os = new FileOutputStream("test.txt");
         InputStream is = new FileInputStream("test.txt");
         os.write('A');
         os.flush();
         os.write('B');
         System.out.println("" +(char) is.read());
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
}

Output:

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