Here's an example of how to use the FileDeleteStrategy class from the org.apache.commons.io package in Java to delete a file:

import org.apache.commons.io.FileDeleteStrategy;
import java.io.File;

public class Main {
    public static void main(String[] args) {
        File file = new File("path/to/file");

        try {
            FileDeleteStrategy.FORCE.delete(file);
            System.out.println("File deleted successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

This example shows how to use the FORCE constant from the FileDeleteStrategy class to delete a file. The delete() method attempts to delete the file, and throws an IOException if the file cannot be deleted.

It's important to note that FileDeleteStrategy is deprecated as of commons-io 2.6, and it was removed in version 2.8, you can use File.delete() instead which is part of the JDK.