This is a simple Java program that allows users to manage a database of students. Users can add students, view all students, find a student by their roll number, and calculate the average mark of all students.
- Add Student: Add a new student to the database with their name, roll number, age, and marks.
- View Students: View all students currently stored in the database.
- Find Student: Find a student by entering their roll number.
- Calculate Average Mark: Calculate the average mark of all students in the database.