Here is an example Java program that demonstrates how to load a file as an InputStream:

import java.io.*;

public class FileToInputStream {
    public static void main(String[] args) {
        try {
            File file = new File("example.txt");
            InputStream inputStream = new FileInputStream(file);

            // Read the first byte of the file
            int data = inputStream.read();
            System.out.println("First byte: " + data);

            // Read the rest of the file and print it to the console
            byte[] bytes = inputStream.readAllBytes();
            String text = new String(bytes);
            System.out.println("File content: " + text);

            // Close the input stream
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

In this program, we first create a File object that points to the file we want to load as an input stream. We then create a FileInputStream object and pass the File object as a parameter to its constructor to create an input stream that reads from the file.

We can then use the InputStream methods to read the contents of the file. In this example, we read the first byte of the file using the read() method and print it to the console. We then read the rest of the file using the readAllBytes() method, convert the resulting byte array to a string using the String constructor, and print it to the console.

Finally, we close the input stream to release any resources it was using.

Note that this is just one way to load a file as an InputStream in Java. There are other methods and classes in the Java I/O API that can be used to accomplish the same task, depending on the specific requirements of your application.