BufferedWriter close() method in Java with Examples

The close() method of BufferedWriter class in Java is used to flush the characters from the buffer stream and then close it. Once the stream is closed further calling the methods like write() and append() will throw the exception.

Syntax:

public void close()

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 close() method in BufferedWriter class in IO package:

Program 1:

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

import java.io.*;

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

            // 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);

            // Close the buffered writer
            buffWriter.close();

            System.out.println(
                stringWriter.getBuffer());
        }
        catch (Exception e) {
            System.out.println(
                "BufferedWriter is closed");
        }
    }
}

Output:

GEEKS

Program 2:

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

import java.io.*;

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

            // 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);

            // Close the buffered writer
            buffWriter.close();

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

            // It will throw exception
            buffWriter.write(
                "GEEKSFORGEEKS", 5, 8);
        }
        catch (Exception e) {
            System.out.println(
                "BufferedWriter is closed");
        }
    }
}

Output:

GEEKS
BufferedWriter is closed

Reference: https://docs.oracle.com/javase/7/docs/api/java/io/BufferedWriter.html#close()