Design In-Memory File System
Try to solve the Design In-Memory File System problem.
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Statement
Design an in-memory file system. The skeleton for the class FileSystem is provided to you. Simulate the following functions:
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Void ls(String path): If path is a file path, return a list that only contains the file’s name. If it’s a directory path, return the list of files and directory names in this directory. Your function should return the output (file and directory names together) in lexicographical order.
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Void mkdir(String path): If the given path does not exist, make a new directory according to it. The function should create all the middle directories in the path if they don’t exist.
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Void addContentToFile(String filePath, String content): If the file doesn’t exist, create that file containing the given content. If the file already exists, append the given content to the original content.
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Void readContentFromFile(String filePath): Return given file’s content in string format.
Note: You may assume that all directory names and file names only contain lowercase letters, and the same names will not exist in the same directory. Additionally, ...