StudentManagementSystem.java

import java.util.*;

class Student {
    int id;
    String name;
    int age;
    String course;

    
    Student(int id, String name, int age, String course) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.course = course;
    }

    
    void display() {
        System.out.println("ID: " + id + ", Name: " + name + 
                           ", Age: " + age + ", Course: " + course);
    }
}

public class StudentManagementSystem {

    static ArrayList<Student> students = new ArrayList<>();
    static Scanner sc = new Scanner(System.in);

    public static void addStudent() {
        System.out.print("Enter ID: ");
        int id = sc.nextInt();
        sc.nextLine();

        System.out.print("Enter Name: ");
        String name = sc.nextLine();

        System.out.print("Enter Age: ");
        int age = sc.nextInt();
        sc.nextLine();

        System.out.print("Enter Course: ");
        String course = sc.nextLine();

        students.add(new Student(id, name, age, course));
        System.out.println("✅ Student Added Successfully!");
    }

    
    public static void viewStudents() {
        if (students.isEmpty()) {
            System.out.println("⚠️No students found!");
            return;
        }

        for (Student s : students) {
            s.display();
        }
    }

    
    public static void searchStudent() {
        System.out.print("Enter ID to search: ");
        int id = sc.nextInt();

        for (Student s : students) {
            if (s.id == id) {
                System.out.println(" Student Found:");
                s.display();
                return;
            }
        }
        System.out.println("❌ Student not found!");
    }

    
    public static void updateStudent() {
        System.out.print("Enter ID to update: ");
        int id = sc.nextInt();
        sc.nextLine();

        for (Student s : students) {
            if (s.id == id) {
                System.out.print("Enter new name: ");
                s.name = sc.nextLine();

                System.out.print("Enter new age: ");
                s.age = sc.nextInt();
                sc.nextLine();

                System.out.print("Enter new course: ");
                s.course = sc.nextLine();

                System.out.println("✅ Student Updated!");
                return;
            }
        }
        System.out.println("❌ Student not found!");
    }

    
    public static void deleteStudent() {
        System.out.print("Enter ID to delete: ");
        int id = sc.nextInt();

        Iterator<Student> it = students.iterator();

        while (it.hasNext()) {
            Student s = it.next();
            if (s.id == id) {
                it.remove();
                System.out.println("🗑️ Student Deleted!");
                return;
            }
        }
        System.out.println("❌ Student not found!");
    }

    public static void main(String[] args) {
        int choice;

        do {
            System.out.println("\n Student Management System ");
            System.out.println("1. Add Student");
            System.out.println("2. View Students");
            System.out.println("3. Search Student");
            System.out.println("4. Update Student");
            System.out.println("5. Delete Student");
            System.out.println("6. Exit");
            System.out.print("Enter your choice: ");

            choice = sc.nextInt();

            switch (choice) {
                case 1: addStudent(); break;
                case 2: viewStudents(); break;
                case 3: searchStudent(); break;
                case 4: updateStudent(); break;
                case 5: deleteStudent(); break;
                case 6: System.out.println(" Exiting..."); break;
                default: System.out.println(" Invalid choice!");
            }

        } while (choice != 6);
    }
}