如何在Java中获取没有扩展名的文件？

import java.io.File;

public class Main {
    public static void main(String[] args) {
        File file = new File("path/to/file");
        String fileName = file.getName();
        int dotIndex = fileName.lastIndexOf(".");
        String nameWithoutExtension = fileName.substring(0, dotIndex);
        System.out.println(nameWithoutExtension);
    }
}

import java.nio.file.Path;
import java.nio.file.Paths;

public class Main {
    public static void main(String[] args) {
        Path path = Paths.get("path/to/file");
        Path fileName = path.getFileName();
        String fileNameString = fileName.toString();
        int dotIndex = fileNameString.lastIndexOf(".");
        String nameWithoutExtension = fileNameString.substring(0, dotIndex);
        System.out.println(nameWithoutExtension);
    }
}