Scenario

A system is composed of:

• a GradeBook object stores a list of student's subjects and grades (GradeData objects).
• an email notification system that should automatically email a student when grade data is added or updated.
• a dashboard which is automatically updated when grades are added or updated.

The second 2 items on the above list should be updated automatically when the GradeBook changes.

How can we implement this? One option is to use the Observer design pattern.

Getting Started

Create a new project in your IDE and include these 2 files:

Worksheet Task

Answer the questions in the Worksheet.