FilterOutputStream write(byte[]) in Java

write(byte[]): This method is available in the java.io.FilterOutputStream class of Java.

Syntax:

void java.io.FilterOutputStream.write(byte[] b) throws IOException

This method takes one argument. This method writes b.length bytes to this output stream.

The write method of FilterOutputStreamcalls its write method of three arguments with the arguments b, 0, and b.length.

Note that this method does not call the one-argument write method of its underlying output stream with the single argument b.

Parameters: One parameter is required for this method.

b: the data to be written.

Returns: NA

Throws:

IOException - if an I/O error occurs.

Approach 1: When no exception

Java

import java.io.File;
import java.io.FileOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;

public class FilterOutputStreamwrite {
    public static void main(String[] args) throws IOException {
        File data = new File("D:\\hello.txt");
        FileOutputStream file = new FileOutputStream(data);
        FilterOutputStream filter = new FilterOutputStream(file);

        byte b[] = { 'h', 'e', 'l', 'l', 'o', ' ', 'j', 'a', 'v', 'a' };
        filter.write(b);
        System.out.println("Successfully write into the filter output stream");
        filter.close();
    }
}

Output:

Successfully write into the filter output stream

hello.txt

hello java

Approach 2: IOException 

Java

import java.io.File;
import java.io.FileOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;

public class FilterOutputStreamwrite {
    public static void main(String[] args) throws IOException {
        File data = new File("D:\\hello.txt");
        FileOutputStream file = new FileOutputStream(data);
        FilterOutputStream filter = new FilterOutputStream(file);

        byte b[] = { 'h', 'e', 'l', 'l', 'o', ' ', 'j', 'a', 'v', 'a' };
        filter.close();

        filter.write(b);
        System.out.println("Successfully write into the filter output stream");
        filter.close();
    }
}

Output

Exception in thread "main" java.io.IOException: Stream Closed
	at java.base/java.io.FileOutputStream.write(Native Method)
	at java.base/java.io.FileOutputStream.write(FileOutputStream.java:311)
	at java.base/java.io.FilterOutputStream.write(FilterOutputStream.java:87)
	at java.base/java.io.FilterOutputStream.write(FilterOutputStream.java:137)
	at java.base/java.io.FilterOutputStream.write(FilterOutputStream.java:108)
	

Some other methods of FilterOutputStream

close(): This method closes this output stream and releases any system resources associated with the stream.

flush(): This method flushes this output stream and forces any buffered output bytes to be written out to the stream.

write(int): This method writes the specified byte to this output stream.

write(byte[], int, int): This method writes len bytes from the specified byte array starting at offset off to this output stream.