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单项选择题Which determines if “prefs” is a directory and exists on the file system?()  

A、 Boolean exists=Directory.exists (“prefs”);

B、 Boolean exists=(new File(“prefs”)).isDir();

C、 Boolean exists=(new Directory(“prefs”)).exists();

D、 Boolean exists=(new File(“prefs”)).isDirectory();

E、 Boolean exists=true;  Try{  Directory d = new Directory(“prefs”);  } catch (FileNotFoundException e) {  exists = false;  }

  • D
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