Student Database Management System

This is a simple Student Database Management System implemented in Java. It allows users to perform various operations such as adding students, viewing student details, searching for a student by roll number, calculating the average marks of all students, and exiting the program.

Features

• Add Student: Users can add a new student by providing their name, roll number, age, and marks.
• View Student: Users can view the details of all students currently stored in the database.
• Search Student: Users can search for a specific student by entering their roll number.
• Calculate Average Marks: The system can calculate and display the average marks of all students.
• Exit: Users can choose to exit the program.

How to Use

1. Compile the Code: Compile the Java file (Database.java) using a Java compiler.

   javac Database.java

2. Run the Program: Execute the compiled Java file.

   java Database

3. Follow On-Screen Instructions: Once the program is running, follow the on-screen menu to perform various operations.

Usage Instructions

• When prompted, enter the corresponding number for the operation you want to perform.
• For adding a student, provide the required details such as name, roll number, age, and marks.
• To view all students, select the option to view students.
• To search for a specific student, enter their roll number.
• The option to calculate average marks will display the average marks of all students stored in the database.
• Choose the exit option to terminate the program.

Note

• This program uses a HashMap to store student records. Roll numbers serve as the keys, and Student objects are stored as values.
• Input is read from the console using the Scanner class.
• Ensure valid input is provided to avoid unexpected behavior or errors.

Example

'''

1. Add Student :
2. View Database :
3. Search Student (Input roll number) :
4. Calculate Average Marks :
5. Exit Loop

Enter your choice : 1 Enter student name : John Doe Enter roll number : 101 Enter age : 20 Enter marks : 85.5 Student added successfully!

1. Add Student :
2. View Database :
3. Search Student (Input roll number) :
4. Calculate Average Marks :
5. Exit Loop

Enter your choice : 2

Student Details: Name: John Doe Roll Number: 101 Age: 20 Marks: 85.5

1. Add Student :
2. View Database :
3. Search Student (Input roll number) :
4. Calculate Average Marks :
5. Exit Loop

Enter your choice : 4 Average marks is 85.5

'''