3.5  Example: Data definitions for a list of files and directrories

Data definition:

• A File consists of a name (String) and a size (Number)

• A Directory consists of a name (String) and a lode (ALoDE)

• An ADE (directory entry) is either

  • a File

  • a Directory

• ALoDE (a list of directory entries) is either

  • MtLoDE - an empty list of directory entries

  • ConsLoDe consisting of a fst (ADE) and a rst (ALoDE)

Challenge1: Can you design the class diagram for this class hierarchy? (Do not peak on the next page!!!)