CS 47/147 Advanced Object-Oriented Programming - Caltech

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Book Example: File System• Basic objects in a filesystem:Files and Directories.FileDir• Each box (node) indiagram is a set.• Some sets correspond totypes or classes; othersmay not.• We know a set’s intuitivemeaning, but don’t specifyits members concretely.12
Book Example: File System• Files are just files. Never mindtheir structure for now.FileDir• Aside: in Unix-style filesystems, files can have manynames and be listed in manydirectories.• What are the importantcharacteristics of a directory?– Has zero or more entries, eacheither a file or directory.– Entries have names.– Has a parent, unless it’s theroot.13
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CS 47/147 Advanced Object-Oriented Programming - Caltech

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