BufferedWriter write(char[], int, int) in Java

write(char[], int, int): This method is available in the java.io.BufferedWriter class of Java.

Syntax:

void java.io.BufferedWriter.write(char[] cbuf, int off, int len) throws IOException

This method takes three arguments. This method writes a portion of an array of characters.

Ordinarily, this method stores characters from the given array into this stream's buffer, flushing the buffer to the underlying stream as needed.

Parameters: Three parameters are required for this method.

cbuf: A character array.

off: Offset from which to start reading characters.

len: Number of characters to write.

Returns: NA

Throws:

1. IndexOutOfBoundsException - If off is negative, or len is negative, or off + len is negative or greater than the length of the given array.

2. IOException - If an I/O error occurs

Approach 1: When no exception

Java

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class BufferedWriterwrite2 {
    public static void main(String[] args) throws IOException {

        FileWriter fileWriter = new FileWriter("D:\\hello.txt");
        BufferedWriter bufferedWriter = 
                      new BufferedWriter(fileWriter);

        char cbuf[] = { 'a', 'b', 'c', 'd', 'e' };
        int off = 0, len = 3;
        bufferedWriter.write(cbuf, off, len);

        System.out.println("Successfully writes");
        bufferedWriter.close();
    }
}

Output:

Successfully writes

hello.txt => abc

Approach 2: IndexOutOfBoundsException 

Java

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class BufferedWriterwrite2 {
    public static void main(String[] args) throws IOException {

        FileWriter fileWriter = new FileWriter("D:\\hello.txt");
        BufferedWriter bufferedWriter = 
                      new BufferedWriter(fileWriter);

        char cbuf[] = { 'a', 'b', 'c', 'd', 'e' };
        int off = 0, len = 10;
        bufferedWriter.write(cbuf, off, len);

        System.out.println("Successfully writes");
        bufferedWriter.close();
    }
}

Output:

Exception in thread "main" java.lang.IndexOutOfBoundsException
	at java.base/java.io.BufferedWriter.write(BufferedWriter.java:174)
	

Approach 3: IOException

Java

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class BufferedWriterwrite2 {
    public static void main(String[] args) throws IOException {

        FileWriter fileWriter = new FileWriter("D:\\hello.txt");
        BufferedWriter bufferedWriter = 
                          new BufferedWriter(fileWriter);

        char cbuf[] = { 'a', 'b', 'c', 'd', 'e' };
        int off = 0, len = 3;
        bufferedWriter.close();
        bufferedWriter.write(cbuf, off, len);

        System.out.println("Successfully writes");

    }
}

Output:

Exception in thread "main" java.io.IOException: Stream closed
	at java.base/java.io.BufferedWriter.ensureOpen(BufferedWriter.java:107)
	at java.base/java.io.BufferedWriter.write(BufferedWriter.java:171)