code and setup

src/main/java/models/Teacher.java

@@ -0,0 +1,53 @@
+package models;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Teacher extends User {
+    private List<Course> myCourses;
+
+    public Teacher(String username, String password) {
+        super(username, password);
+        this.myCourses = new ArrayList<>();
+    }
+
+    public boolean addCourse(Course course) {
+        if (myCourses.contains(course)) {
+            return false;
+        }
+        myCourses.add(course);
+        course.setTeacher(this);
+        return true;
+    }
+
+    public boolean removeCourse(Course course) {
+        if (myCourses.remove(course)) {
+            course.setTeacher(null);
+            return true;
+        }
+        return false;
+    }
+
+    public List<Course> getMyCourses() {
+        return myCourses;
+    }
+
+    public void showMyCourses() {
+        if (myCourses.isEmpty()) {
+            System.out.println(" You don't teach any course yet.");
+        } else {
+            System.out.println("\n My Courses:");
+            for (int i = 0; i < myCourses.size(); i++) {
+                System.out.println("  " + (i+1) + ". " + myCourses.get(i));
+            }
+        }
+    }
+
+    public void showStudentsInCourse(Course course) {
+        if (!myCourses.contains(course)) {
+            System.out.println(" You don't teach this course!");
+            return;
+        }
+        course.showStudents();
+    }
+}