Student-management-system

Student Management System

A Java console application built with Core Java, OOP principles, and Collections Framework featuring full CRUD operations, file-based data persistence, sorting, and statistics.

Features

• addStudent() — with ID, name, and marks validation
• viewAllStudents() — formatted table with grades
• searchStudent() — instant lookup by ID
• deleteStudent()— with confirmation
• updateMarks() — immutable object replacement pattern
• sortbyName() — alphabetical order using Bubble Sort
• SortbyMarks() — rank-wise descending order
• Show Average() — calculated fresh from data
• Top & LowestPerformer() — instant identification
• Statistics() — total, average, highest, lowest, pass/fail count
• filePersistence() — data saved to students.txt across sessions
• Exception Handling — handles invalid inputs gracefully

🛠️ Tech Stack

Technology	Usage
Java	Core language
Collections Framework	LinkedHashMap for ordered storage
File I/O	BufferedWriter / BufferedReader
OOP	Encapsulation, Immutability
Exception Handling	InputMismatchException, IOException

📁 Project Structure

src/ └── com/ └── studentmanager/ ├── main/ │ └── Main.java # Entry point, menu, user input ├── model/ │ └── Student.java # Immutable Student entity with grade logic └── service/ └── StudentManager.java # Business logic, CRUD, sorting, statistics

▶️ How to Run

Prerequisites: Java JDK 8 or above

```bash

Clone the repository

git clone https://github.com/YOUR_USERNAME/student-management-system.git

Navigate to project

cd student-management-system

Create output folder

mkdir out

Compile

javac -d out src/com/studentmanager/model/Student.java src/com/studentmanager/service/StudentManager.java src/com/studentmanager/main/Main.java

Run

java -cp out com.studentmanager.main.Main

📸 Sample Output

No saved data found, Staring fresh. STUDENT MANAGEMENT SYSTEM 1.Add Student 2.View All Student Details 3.Search Student 4.Delete Student 5.Show Average Marks 6.Sort by Names 7.(Want to know ranks?) Sort by marks 8.Update the marks 9.Save Data 10.Top Performer 11.Lowest Performer 12.Show Statistics 13.Exit Enter your choice: 1 Enter Student ID: 1 Enter Student Name: Akshaya Enter Student Marks (0-100): 99 Student added Successfully STUDENT MANAGEMENT SYSTEM 1.Add Student 2.View All Student Details 3.Search Student 4.Delete Student 5.Show Average Marks 6.Sort by Names 7.(Want to know ranks?) Sort by marks 8.Update the marks 9.Save Data 10.Top Performer 11.Lowest Performer 12.Show Statistics 13.Exit Enter your choice: 1 Enter Student ID: 2 Enter Student Name: supriya Enter Student Marks (0-100): 88 Student added Successfully STUDENT MANAGEMENT SYSTEM 1.Add Student 2.View All Student Details 3.Search Student 4.Delete Student 5.Show Average Marks 6.Sort by Names 7.(Want to know ranks?) Sort by marks 8.Update the marks 9.Save Data 10.Top Performer 11.Lowest Performer 12.Show Statistics 13.Exit Enter your choice: 1 Enter Student ID: 3 Enter Student Name: ashok Enter Student Marks (0-100): 89 Student added Successfully STUDENT MANAGEMENT SYSTEM 1.Add Student 2.View All Student Details 3.Search Student 4.Delete Student 5.Show Average Marks 6.Sort by Names 7.(Want to know ranks?) Sort by marks 8.Update the marks 9.Save Data 10.Top Performer 11.Lowest Performer 12.Show Statistics 13.Exit Enter your choice: 1 Enter Student ID: 4 Enter Student Name: yashmi Enter Student Marks (0-100): 68 Student added Successfully STUDENT MANAGEMENT SYSTEM 1.Add Student 2.View All Student Details 3.Search Student 4.Delete Student 5.Show Average Marks 6.Sort by Names 7.(Want to know ranks?) Sort by marks 8.Update the marks 9.Save Data 10.Top Performer 11.Lowest Performer 12.Show Statistics 13.Exit Enter your choice: 1 Enter Student ID: 5 Enter Student Name: Arjun Enter Student Marks (0-100): 100 Student added Successfully STUDENT MANAGEMENT SYSTEM 1.Add Student 2.View All Student Details 3.Search Student 4.Delete Student 5.Show Average Marks 6.Sort by Names 7.(Want to know ranks?) Sort by marks 8.Update the marks 9.Save Data 10.Top Performer 11.Lowest Performer 12.Show Statistics 13.Exit Enter your choice: 2 ID: 1 | Name: Akshaya | Marks: 99.00 | Grade: A+ Outstanding ID: 2 | Name: supriya | Marks: 88.00 | Grade: A Excellent ID: 3 | Name: ashok | Marks: 89.00 | Grade: A Excellent ID: 4 | Name: yashmi | Marks: 68.00 | Grade: C Good ID: 5 | Name: Arjun | Marks: 100.00 | Grade: A+ Outstanding

Key Concepts Demonstrated

• Immutability — Student class is final with all private final fields
• Encapsulation — data hidden behind getters, no public fields
• Collections — LinkedHashMap preserves insertion order
• File I/O — persistent storage across program sessions
• Exception Handling — program never crashes on bad input
• Bubble Sort — implemented from scratch without Comparator
• Package Structure — MVC-style separation of concerns

Author

Balabhadra Sri Naga Vasavi Lakshmi Akshaya B.Tech CSE — Vignan’s Institute of Engineering for Women – 2027 mail - akshayabalabhadra@gmail.com
Linkedin - (https://www.linkedin.com/in/srinagab/)