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For requirement 1: The method used to take input from the user is up to you. You can use either command line arguments (in the same way as the examples), prompt the user for command line input (using a Scanner), or build a simple GUI to allow option and file selections. In all cases however, the user needs to be able to specify a file/directory name, plus various other input options. For requirement 2: The given interface is as follows. Please use the same method names, but feel free to change the return types to match your chosen hash function values, e.g. you may want to change the return types to long or String You may also decide to change the parameter type, e.g. you could change the type to File rather than String if you prefer. interface HashChecker { int produceFileHash(String filename); int produceDirHash(String path); int produceDirMetaHash(String path); } For requirement 3: For the third requirement, the easiest way to access and update the data file contents is to build a class that implements the interface [login to view URL] than attempt to change file content dynamically it is easier to read all records from the file into memory, do the checking/amendments, then write the whole file out again. interface FileAccessor { void loadDataFile(); // called to load the contents of the data file void saveDataFile(); // called to save the contents of the data file void addHashDetails(String fileName, String newHash); void replaceHashDetails(String fileName, String newHash); void removeDetails(String fileName); } Any class that implements this interface will need to store a collection of Entry values (each entry represents a record read from the data file), hence you should probably also define an Entry class such as - class Entry { String fileName; String hashValue; int algorithmID; // methods to set/get attributes for this entry }