尝试复制文件夹时出错

Question

我目前正在尝试使用命令开发文件资源管理器程序（如CMD thingy）。我在尝试复制文件夹时遇到错误，但我找不到问题。

public  class Action {

    public static void copy(String srcDestination, String desDestination) throws IOException{
        Scanner userEntry= new Scanner(System.in);
        String userInput;

        String sSource=srcDestination;
        String sDesignated=desDestination;


        Path pSource = Paths.get(sSource);
        Path pDesignated = Paths.get(sDesignated);
        File fSource= new File(sSource);
        File fDesignated= new File(sDesignated);

        if(!fSource.exists()){

            System.out.println("Source directory does not exist!");

        }
        else if (!fDesignated.exists()){
            System.out.println("Destination directory does not exist! Would you like to create it now? Y/N");
            userInput=userEntry.nextLine();


            if(userInput.equals("Y")||userInput.equals("y")){
                fDesignated.mkdir();
            }
            Files.copy(pSource, pDesignated, StandardCopyOption.COPY_ATTRIBUTES);
        }
        Files.copy(pSource, pDesignated, StandardCopyOption.COPY_ATTRIBUTES);

        System.out.println("Done");

    }


}

我得到的错误

Exception in thread "main" java.nio.file.FileAlreadyExistsException: E:\destFOLDER  at sun.nio.fs.WindowsFileCopy.copy(WindowsFileCopy.java:123)
at sun.nio.fs.WindowsFileSystemProvider.copy(WindowsFileSystemProvider.java:278)
at java.nio.file.Files.copy(Files.java:1225)
at pm.entitymanager.logic.file.Action.copy(Action.java:55)
at pm.entitymanager.logic.file.ApplicationLogic.main(ApplicationLogic.java:64)

Java结果：1