java - Design Patterns for project managing system -


I will make "decorator pattern" for my project called "Project Management System" This is the application where the lecturer students students You can add project topics, make reservations, choose and make reservations. Every student can send their progress, lecturers can assess etc. I used the first design method called "factory method" as the picture below and my lecturer accepted this method for the 4th time because I made many mistakes.

I need your help with the decorator pattern because I do not really know how to draw it. Thanks and sorry for my english

This link may help:


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