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

import org.apache.commons.io.input.DataFormatDetector;
import org.apache.commons.io.input.TikaInputStream;

import java.io.File;
import java.io.IOException;

public class Example {
    public static void main(String[] args) throws IOException {
        // Create a File object
        File file = new File("/path/to/file");

        // Create a DataFormatDetector
        DataFormatDetector detector = new DataFormatDetector();

        // Add the formats you want to detect
        detector.add(new TikaInputStream.TikaInputStreamDetector());
        // Add other detectors if needed

        // Detect the data format of the file
        String format = detector.detect(file);

        // Print the detected format
        System.out.println("Detected format: " + format);
    }
}

In this example, the DataFormatDetector class is being used to detect the data format of a file. The file is specified using a File object. The add method is used to add the different formats that you want to detect. In this example, the TikaInputStream is used to detect the format of the file. The detect method is then used to detect the format of the file. The detected format is then printed.

You can also use the add method to add your own custom detector by implementing the Detector interface. This class can be useful if you want to detect the format of different file and don't want to use third party libraries.