Here is an example of how to use the BufferedFileChannelInputStream class from the Apache Commons IO library in Java:

import java.io.FileInputStream;
import java.io.IOException;
import org.apache.commons.io.input.BufferedFileChannelInputStream;

public class MyClass {
    public static void main(String[] args) throws IOException {
        FileInputStream inputStream = new FileInputStream("example.txt");
        try (BufferedFileChannelInputStream bufferedInputStream = new BufferedFileChannelInputStream(inputStream)) {
            int nextByte = bufferedInputStream.read();
            while (nextByte != -1) {
                // do something with the byte
                nextByte = bufferedInputStream.read();
            }
        }
    }
}

In this example, BufferedFileChannelInputStream is wrapping a FileInputStream for the file "example.txt".

It provides buffering for input from a file channel, using a byte buffer to reduce the number of calls to the underlying channel.

The try-with-resources statement is used to automatically close the BufferedFileChannelInputStream when the try block is exited.

The BufferedFileChannelInputStream is used in the same way as any other InputStream, in this case it reads a byte at a time until the end of the file is reached.

Please note that this is a simple example, in real-world usage, you might want to do more complex processing on the bytes before returning them.