StudentService.java

import java.util.*;

public class StudentService {
    private final List<Student> students = new ArrayList<>();

    public void addStudent(Student student) {
        students.add(student);
        System.out.println("✔ Student added successfully.");
    }

    public void viewAllStudents() {
        if (students.isEmpty()) {
            System.out.println("⚠ No student records found.");
            return;
        }
        System.out.println("\n--- Student List ---");
        for (Student student : students) {
            System.out.println(student);
        }
    }

    public Student searchStudentById(int id) {
        return students.stream()
                .filter(s -> s.getId() == id)
                .findFirst()
                .orElse(null);
    }

    public boolean updateStudentById(int id, String name, int age, String course) {
        Student student = searchStudentById(id);
        if (student != null) {
            student.setName(name);
            student.setAge(age);
            student.setCourse(course);
            return true;
        }
        return false;
    }

    public boolean deleteStudentById(int id) {
        Student student = searchStudentById(id);
        if (student != null) {
            students.remove(student);
            return true;
        }
        return false;
    }
}