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

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

Syntax:

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

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

Parameters: Three parameters are required for this method.

cbuf: Buffer of characters.

off: Offset from which to start writing 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.

3. NullPointerException- If cbuf is null.

Approach 1: When no exception

Java

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class OutputStreamWriterwrite2 {
    public static void main(String[] args) throws IOException {

        OutputStream out = new FileOutputStream("D:\\hello.txt");
        OutputStreamWriter outputStreamWriter = 
                        new OutputStreamWriter(out);

        char cbuf[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g' };
        int off = 0, len = 4;
        outputStreamWriter.write(cbuf, off, len);
        System.out.println("Successfully writes");
        outputStreamWriter.close();
    }
}

Output:

Successfully writes

Approach 2: IndexOutOfBoundsException

Java

package com.OutputStreamWriter;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class OutputStreamWriterwrite2 {
    public static void main(String[] args) throws IOException {

        OutputStream out = new FileOutputStream("D:\\hello.txt");
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(out);

        char cbuf[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g' };
        int off = 0, len = 14;
        outputStreamWriter.write(cbuf, off, len);
        System.out.println("Successfully writes");
        outputStreamWriter.close();
    }
}

Output:

Exception in thread "main" java.lang.IndexOutOfBoundsException
	at java.base/sun.nio.cs.StreamEncoder.write(StreamEncoder.java:127)
	at java.base/java.io.OutputStreamWriter.write(OutputStreamWriter.java:208)
	at com.OutputStreamWriter.OutputStreamWriterwrite2.main(OutputStreamWriterwrite2.java:16)

Approach 3: IOException 

Java

package com.OutputStreamWriter;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class OutputStreamWriterwrite2 {
    public static void main(String[] args) throws IOException {

        OutputStream out = new FileOutputStream("D:\\hello.txt");
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(out);

        char cbuf[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g' };
        int off = 0, len = 4;
        outputStreamWriter.close();
        outputStreamWriter.write(cbuf, off, len);
        System.out.println("Successfully writes");
        
    }
}

Output:

Exception in thread "main" java.io.IOException: Stream closed
	at java.base/sun.nio.cs.StreamEncoder.ensureOpen(StreamEncoder.java:51)
	at java.base/sun.nio.cs.StreamEncoder.write(StreamEncoder.java:124)
	at java.base/java.io.OutputStreamWriter.write(OutputStreamWriter.java:208)
	at com.OutputStreamWriter.OutputStreamWriterwrite2.main(OutputStreamWriterwrite2.java:17)

Approach 4: NullPointerException

Java

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class OutputStreamWriterwrite2 {
    public static void main(String[] args) throws IOException {

        OutputStream out = new FileOutputStream("D:\\hello.txt");
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(out);

        char cbuf[] = null;
        int off = 0, len = 4;
        outputStreamWriter.write(cbuf, off, len);
        System.out.println("Successfully writes");
        outputStreamWriter.close();
    }
}

Output:

Exception in thread "main" java.lang.NullPointerException: Cannot read the array length because "cbuf" is null
	at java.base/sun.nio.cs.StreamEncoder.write(StreamEncoder.java:125)
	at java.base/java.io.OutputStreamWriter.write(OutputStreamWriter.java:208)
	at com.OutputStreamWriter.OutputStreamWriterwrite2.main(OutputStreamWriterwrite2.java:16)

Some other methods of OutputStreamWriter

close(): This method closes the stream, flushing it first.

flush(): This method flushes the stream.

getEncoding(): This method returns the name of the character encoding being used by this stream.

OutputStreamWriter(OutputStream): This method creates an OutputStreamWriter that uses the default character encoding.

OutputStreamWriter(OutputStream, Charset): This method creates an OutputStreamWriter that uses the given charset.

OutputStreamWriter(OutputStream, CharsetEncoder): This method creates an OutputStreamWriter that uses the given charset encoder.

OutputStreamWriter(OutputStream, String): This method creates an OutputStreamWriter that uses the named charset.

write(int): This method writes a single character.

write(char[], int, int): This method writes a portion of an array of characters.

write(String, int, int): This method writes a portion of a string.