Scala-如何根据上次修改日期对文件进行分组？

import java.io.File
import java.nio.file.attribute.BasicFileAttributes
import java.nio.file.{FileVisitResult, Files, Path, SimpleFileVisitor}

import scala.collection.mutable

object FileGrouping {
  def main(args: Array[String]): Unit = {
    val directory = new File("path/to/directory") // 指定要分组的目录路径
    val fileGroups = groupFilesByLastModified(directory)
    
    fileGroups.foreach { case (lastModified, files) =>
      println(s"Last Modified: $lastModified")
      files.foreach(println)
      println()
    }
  }
  
  def groupFilesByLastModified(directory: File): Map[Long, Seq[File]] = {
    val fileGroups = mutable.Map.empty[Long, mutable.ArrayBuffer[File]]
    
    Files.walkFileTree(directory.toPath, new SimpleFileVisitor[Path] {
      override def visitFile(file: Path, attrs: BasicFileAttributes): FileVisitResult = {
        val lastModified = attrs.lastModifiedTime().toMillis
        fileGroups.getOrElseUpdate(lastModified, mutable.ArrayBuffer.empty[File]) += file.toFile
        FileVisitResult.CONTINUE
      }
    })
    
    fileGroups.mapValues(_.toSeq).toMap
  }
}