Desktop.edit(File f): Uses the program associated with the edit command of the file type to open the file.

edit(File f)：使用与文件类型的 edit命令相关的程序打开文件。

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Desktop.open (file f) : Uses the program associated with the open command of the file type to open the file.

open (File f)：使用与文件类型的openc命令相关的程序打开文件。

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