1 Activity. Use API Java Class File.

Implement methodes from Class File.
1b Activity. Implement mmethodes from class File. 

Create new directory and new file, delete, rename.
Compare Files. 1c Activity.

Use FileReader a BufferedReader.
Compare Files. 1c Activity withMethode
Compare Files 1cActivity 
Change name files
Try debbug
Activity 1a : GestionFicherosApp

Using io.File