code and setup

src/main/java/services/SchoolSystem.java

@@ -0,0 +1,77 @@
+package services;
+
+import models.*;
+import java.util.ArrayList;
+import java.util.List;
+
+public class SchoolSystem {
+    private List<Student> students;
+    private List<Teacher> teachers;
+    private List<Course> allCourses;
+
+    public SchoolSystem() {
+        this.students = new ArrayList<>();
+        this.teachers = new ArrayList<>();
+        this.allCourses = new ArrayList<>();
+    }
+
+    // ========== Student Management ==========
+    //TODO
+
+    // ========== Teacher Management ==========
+    public boolean registerTeacher(String username, String password) {
+        if (findTeacher(username) != null) {
+            return false;
+        }
+        teachers.add(new Teacher(username, password));
+        return true;
+    }
+
+    public Teacher loginTeacher(String username, String password) {
+        Teacher teacher = findTeacher(username);
+        if (teacher != null && teacher.checkPassword(password)) {
+            return teacher;
+        }
+        return null;
+    }
+
+    private Teacher findTeacher(String username) {
+        for (Teacher t : teachers) {
+            if (t.getUsername().equals(username)) return t;
+        }
+        return null;
+    }
+
+    // ========== Course Management ==========
+    public boolean addCourseToSystem(String courseName) {
+       //TODO
+        return true;
+    }
+
+    public Course findCourseById(int id) {
+       //TODO
+        return null;
+    }
+
+    public Course findCourseByName(String name) {
+        for (Course c : allCourses) {
+            if (c.getName().equalsIgnoreCase(name)) return c;
+        }
+        return null;
+    }
+
+    public void showAllCourses() {
+        if (allCourses.isEmpty()) {
+            System.out.println(" No courses available yet.");
+        } else {
+            System.out.println("\n All Available Courses:");
+            for (int i = 0; i < allCourses.size(); i++) {
+                System.out.println("  " + (i+1) + ". " + allCourses.get(i));
+            }
+        }
+    }
+
+    public List<Course> getAllCourses() {
+        return allCourses;
+    }
+}