Student-Management-System-Java/StudentService.java at main · ushathota68/Student-Management-System-Java · GitHub

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import java.util.ArrayList;

public class StudentService {

    private ArrayList<Student> students = new ArrayList<>();

    // Add Student
    public void addStudent(Student student) {

        // Duplicate ID Check
        for (Student s : students) {
            if (s.getId() == student.getId()) {
                System.out.println("\nStudent ID already exists!");
                return;
            }
        }

        students.add(student);
        System.out.println("\nStudent Added Successfully!");
    }

    // View Students
    public void viewStudents() {

        if (students.isEmpty()) {
            System.out.println("\nNo Students Found!");
            return;
        }

        System.out.println("\n==================== STUDENT LIST ====================");

        System.out.printf("%-6s %-20s %-12s %-8s %-15s%n",
                "ID", "NAME", "BRANCH", "YEAR", "PHONE");

        System.out.println("---------------------------------------------------------------");

        for (Student s : students) {

            System.out.printf("%-6d %-20s %-12s %-8d %-15s%n",
                    s.getId(),
                    s.getName(),
                    s.getBranch(),
                    s.getYear(),
                    s.getPhone());

        }

        System.out.println("---------------------------------------------------------------");
    }

    // Search Student
    public void searchStudent(int id) {

        for (Student s : students) {

            if (s.getId() == id) {

                System.out.println("\n=========== STUDENT FOUND ===========");

                System.out.println("ID      : " + s.getId());
                System.out.println("Name    : " + s.getName());
                System.out.println("Branch  : " + s.getBranch());
                System.out.println("Year    : " + s.getYear());
                System.out.println("Phone   : " + s.getPhone());

                return;
            }
        }

        System.out.println("\nStudent Not Found!");
    }

    // Update Student
    public void updateStudent(int id, String name, String branch, int year, String phone) {

        for (Student s : students) {

            if (s.getId() == id) {

                s.setName(name);
                s.setBranch(branch);
                s.setYear(year);
                s.setPhone(phone);

                System.out.println("\nStudent Updated Successfully!");
                return;
            }

        }

        System.out.println("\nStudent Not Found!");
    }

    // Delete Student
    public void deleteStudent(int id) {

        for (int i = 0; i < students.size(); i++) {

            if (students.get(i).getId() == id) {

                students.remove(i);

                System.out.println("\nStudent Deleted Successfully!");
                return;
            }

        }

        System.out.println("\nStudent Not Found!");
    }

}