如何确定给定文件是一个类文件？

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class ClassFileChecker {
    public static void main(String[] args) {
        String filePath = "path/to/your/file.class";
        Path path = Paths.get(filePath);

        try {
            byte[] fileBytes = Files.readAllBytes(path);
            int magicNumber = ((fileBytes[0] & 0xFF) << 24) |
                              ((fileBytes[1] & 0xFF) << 16) |
                              ((fileBytes[2] & 0xFF) << 8) |
                              (fileBytes[3] & 0xFF);

            if (magicNumber == 0xCAFEBABE) {
                System.out.println("This is a class file.");
            } else {
                System.out.println("This is not a class file.");
            }
        } catch (IOException e) {
            System.out.println("Error reading file: " + e.getMessage());
        }
    }
}