scala 刪除一個文件夾以及其子目錄和文件

/**
* 刪除一個文件夾,及其子目錄
*
* @param dir
*/
def deleteDir(dir: File): Unit = {
val files = dir.listFiles()
files.foreach(f => {
if (f.isDirectory) {
deleteDir(f)
} else {
f.delete()
println("delete file " + f.getAbsolutePath)
}
})
dir.delete()
println("delete dir " + dir.getAbsolutePath)
}