write main class

src/CourseRegistrationStarter/Main.java

@@ -1,34 +1,120 @@
 package CourseRegistrationStarter;
 
+import java.util.Scanner;
+
 public class Main {
     public static void main(String[] args) {
 
-        Course riazi2 = new Course("riazi2" , "200" , 5);
-        Course ap = new Course("ap" , "201" , 2);
-        Course bp = new Course("bp" , "202" , 5);
-        Course riazi1 = new Course("riazi1" , "203" , 7);
-        Course os = new Course("os" , "204" , 10);
 
-        Student daneshjo = new Student("ali" , "11111");
+        RegistrationSystem register = new RegistrationSystem();
+        Course riazi1 = new Course("riazi1" , "200" , 5);
+        Course riazi2 = new Course("riazi2" , "201" , 4);
+        Course ap = new Course("ap" , "202" , 10);
+        Course bp = new Course("bp" , "203" , 0);
+
+        register.addCourseToSystem(riazi1);
+        register.addCourseToSystem(riazi2);
+        register.addCourseToSystem(ap);
+        register.addCourseToSystem(bp);
+
+        Student daneshjo = new Student("ali" , "404222000");
+        boolean yes = true;
+
+        while( yes == true ){
+
+            System.out.println("----------Menu----------");
+            System.out.println("1. show all course");
+            System.out.println("2. add course");
+            System.out.println("3. delete course");
+            System.out.println("4.my course");
+            System.out.println("5.exit");
+            System.out.print("choose item :");
+
+            Scanner input = new Scanner(System.in);
+            int n = input.nextInt();
+            n = (n % 5);
+
+            switch (n)
+            {
+                case 1:
+                {
+                    register.showAllCourses();
+                    break;
+                }
+                case 2:
+                {
+                    System.out.println("please enter the code of course");
+                    String courseCode = input.next();
+                    if(register.findCourseByCode(courseCode) != null){
+                        if(daneshjo.addCourse(register.findCourseByCode(courseCode))){
+                            System.out.println("done");
+                        }
+                        else{
+                            if(register.findCourseByCode(courseCode).getCapacity() <=0){
+                                System.out.println("cours is full");
+                            }
+                            else if(daneshjo.existe(register.findCourseByCode(courseCode))){
+                                System.out.println("you have get this course befor");
+                            }
+                            else {
+                                System.out.println("you have deleted this course befor");
+                            }
+                        }
+                    }
+                    else {
+                        System.out.println("invalid course");
+                    }
+                    break;
+                }
+
+                case 3:
+                {
+                    System.out.println("please enter the code of course");
+                    String courseCode = input.next();
+                    if(register.findCourseByCode(courseCode) != null){
+                        if(daneshjo.dropCourse(register.findCourseByCode(courseCode))){
+                            System.out.println("done");
+                        }
+                        else {
+                            System.out.println("invaild");
+                        }
+
+                    }
+                    else{
+                        System.out.println("Invalid course");
+                    }
+                    break;
+
+                }
+
+                case 4:
+                {
+                    daneshjo.showRegisteredCourses();
+                    break;
+                }
+
+                case 0:
+                {
+                    yes = false;
+                    break;
+                }
 
 
-        RegistrationSystem regis = new RegistrationSystem();
+            }
 
-        regis.addCourseToSystem(riazi1);
-        regis.addCourseToSystem(riazi2);
-        regis.addCourseToSystem(ap);
-        regis.addCourseToSystem(bp);
-        regis.addCourseToSystem(os);
 
-        daneshjo.addCourse(os);
-        daneshjo.addCourse(bp);
-        daneshjo.addCourse(riazi1);
 
-        daneshjo.dropCourse(os);
 
-        daneshjo.showRegisteredCourses();
 
-        regis.showAllCourses();
+
+
+
+
+
+
+
+
+        }
         // TODO:
         // 1. Create at least 3 courses
         // 2. Create 1 student

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -15,7 +15,7 @@ public class RegistrationSystem {
     public Course findCourseByCode(String code) {
         int n = courses.size();
         for(int i = 0 ; i < n ; i++){
-            if(courses.get(i).getCourseCode() == code){
+            if(courses.get(i).getCourseCode().equals(code)){
                 return courses.get(i);
             }
 
@@ -29,6 +29,7 @@ public class RegistrationSystem {
         for(int i = 0 ; i < n ; i++){
 
             System.out.printf("course name: %10s   "  , courses.get(i).getCourseName());
+            System.out.printf("course code: %10s   "  , courses.get(i).getCourseCode());
             System.out.printf("cours capacity: %10s   " , courses.get(i).getCapacity());
             System.out.println("");
 

src/CourseRegistrationStarter/Student.java

@@ -5,11 +5,13 @@ public class Student {
     private String name;
     private String studentId;
     private ArrayList<Course> registeredCourses;
+    private ArrayList<Course> deletedCourse;
 
     public Student(String name, String studentId) {
         this.name = name;
         this.studentId = studentId;
         this.registeredCourses = new ArrayList<>();
+        this.deletedCourse = new ArrayList<>();
     }
 
     public String getName() {
@@ -21,7 +23,7 @@ public class Student {
     }
 
     public boolean addCourse(Course c) {
-        if(c.getCapacity() > 0){
+        if(c.getCapacity() > 0&& !existe(c) && !checkdeleted(c)){
             registeredCourses.add(c);
             c.reduceCapacity();
             return true;
@@ -35,6 +37,7 @@ public class Student {
             if(registeredCourses.get(i).getCourseName() == c.getCourseName()){
                 registeredCourses.remove(i);
                 c.increaseCapacity();
+                deletedCourse.add(c);
                 return true;
             }
         }
@@ -50,4 +53,28 @@ public class Student {
             System.out.println("");
         }
     }
-}
+
+    public  boolean checkdeleted(Course c){
+        int n = deletedCourse.size();
+        for(int i = 0 ; i < n ; i++){
+            if (deletedCourse.get(i).getCourseCode().equals(c.getCourseCode())){
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public  boolean existe(Course c){
+        int n = registeredCourses.size();
+        for(int i = 0 ; i < n ; i++){
+            if(registeredCourses.get(i).getCourseCode().equals(c.getCourseCode())){
+                return true;
+            }
+
+        }
+        return false;
+    }
+
+}
+