Probleme java

Bonjour
Svp je suis debutante en java et j'ai un probleme a resoudre en java et j'ai rien compris svp aidez moi c'est urgent
The exercise is to write a command line driven text search engine, with usage being:
java -jar jarName mainClassFile directoryContainingTextFiles
This should read all the text files in the given directory, building an in memory representation of the
files and their contents, and then give a command prompt at which interactive searches can be
performed.
An example session might look like:
$ java -jar SimpleSearch.jar Searcher /foo/bar
14 files read in directory /foo/bar
search> to be or not to be file1.txt : 100%
file2.txt : 90%
search>
search> cats
no matches found search> :quit
$
The search should take the words given on the prompt and return a list of the top 10 (maximum)
matching filenames in rank order, giving the rank score against each match.
Note:​ ​We would like to see a working console application, please focus your attention on the search
algorithm and the basic console functionality (you can assume that the input strings are sane).
Ranking
● The rank score must be 100% if a file contains all the words
● It must be 0% if it contains none of the words
● It should be between 0 and 100 if it contains only some of the words but the exact ranking
formula is up to you to choose and implement
Things to consider in your implementation (please read carefully)
● We are expecting ‘production like’ code, i.e. fully tested and well structured code, but not
necessarily feature complete
● You should be spending 2-3 hours on the task, so basic functionality is better than a complex
scoring algorithm and no console application.
● External libraries are forbidden, other than test/mocking frameworks
● Ranking score design — start​ ​with​ ​something​ ​basic,​ then iterate as time allows
● The in memory representation — searches should be relatively efficient
● What constitutes a word?
● What constitutes two words being equal (and matching)?
Deliverables
● Code to implement a version of the above
● A README containing instructions so that we know how to build and run your code