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The flush() method of BufferedWriter class in Java is used to flush the characters from the buffered writer stream. Syntax:

public void flush()
            throws IOException

Specified By: This method is specified by the flush() method of Flushable interface. Overrides: This method overrides the flush() method of Writer class. Parameters: This method does not accept any parameter. Return value: This method does not return any value. Exceptions: This method throws IOException if an I/O error occurs. Below programs illustrate flush() method in BufferedWriter class in IO package: Program 1:

Java

// Java program to illustrate
// BufferedWriter flush() method

import java.io.*;

public class GFG {
    public static void main(String[] args)
        throws IOException
    {

        // Create the string Writer
        StringWriter stringWriter
            = new StringWriter();

        // Convert stringWriter to
        // bufferedWriter
        BufferedWriter buffWriter
            = new BufferedWriter(
                stringWriter);

        // Write "GEEKS" to buffer writer
        buffWriter.write(
            "GEEKSFORGEEKS", 0, 5);

        // Flush the buffer writer
        buffWriter.flush();

        System.out.println(
            stringWriter.getBuffer());
    }
}

Output:

GEEKS

Program 2:

Java

// Java program to illustrate
// BufferedWriter flush() method

import java.io.*;

public class GFG {
    public static void main(String[] args)
        throws IOException
    {
        // Create the string Writer
        StringWriter stringWriter
            = new StringWriter();

        // Convert stringWriter to
        // bufferedWriter
        BufferedWriter buffWriter
            = new BufferedWriter(
                stringWriter);

        // Write "GEEKS" to buffered writer
        buffWriter.write(
            "GEEKSFORGEEKS", 0, 5);

        // Flush the buffered writer
        buffWriter.flush();

        System.out.println(
            stringWriter.getBuffer());

        // Write "GEEKSFORGEEKS"
        // to buffered writer
        buffWriter.write(
            "GEEKSFORGEEKS", 5, 8);

        // Flush the buffered writer
        buffWriter.flush();

        System.out.println(
            stringWriter.getBuffer());
    }
}

Output:

GEEKS
GEEKSFORGEEKS

References: https://docs.oracle.com/javase/10/docs/api/java/io/BufferedWriter.html#flush()

BufferedWriter flush() method in Java with Examples

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