static void Main(string[] args)
{
Student student1 = new Student()
{
GroupName = "LP1"
};
Student student2 = new Student()
{
GroupName = "LP2"
};
Student student3 = new Student()
{
GroupName = "LP3"
};
Pupil pupil1 = new Pupil()
{
ClassName = "1B"
};
Pupil pupil2 = new Pupil()
{
ClassName = "2B"
};
// I want all the people to be in one collection we would use here boxing and unboxing, which is a slow operation
//object[] array = new Object[] { student1, student2, student3, pupil1, pupil2 };
//foreach (var element in array)
//{
//}
//Same we can do with ArrayList, however we can iteratively add elements to list
//ArrayList arrayList = new ArrayList();
//arrayList.Add(student1);
//arrayList.Add(student2);
//arrayList.Add(student3);
//arrayList.Add(pupil1);
//arrayList.Add(pupil2);
//foreach (Pupil element in arrayList)
//{
// Console.WriteLine(element.ClassName);
//}
//Here comes to save a us: generics
List <Pupil> pupils = new List <Pupil>();
pupils.Add(pupil1);
pupils.Add(pupil2);
pupils.Remove(pupil1);
var pupilAtFirstPosition = pupils.ElementAt(0);
Queue <Student> studentsQueue = new Queue <Student>();
studentsQueue.Enqueue(student1);
studentsQueue.Enqueue(student2);
studentsQueue.Enqueue(student3);
Student firstStudentFromQueue = studentsQueue.Dequeue();
Console.WriteLine($"Only {studentsQueue.Count} left in the queue");
Stack <Student> fullMashrutka = new Stack <Student>();
fullMashrutka.Push(student1);
fullMashrutka.Push(student2);
fullMashrutka.Push(student3);
var studentFromMarshrutka = fullMashrutka.Pop();
Console.WriteLine($"First poped student {studentFromMarshrutka.GroupName}.");
//Dictionaries. Why dictionaries: are good, because they are at very efficiently finding an element
//Dictionary<int, string> monthCodes = new Dictionary<int, string>();
//monthCodes.Add(1, "January");
//monthCodes.Add(2, "February");
//monthCodes.Add(3, "March");
//monthCodes.Add(4, "April");
//monthCodes.Add(5, "May");
//monthCodes.Add(6, "June");
//monthCodes.Add(7, "July");
//monthCodes.Add(8, "August");
//monthCodes.Add(9, "September");
////add by index
//monthCodes[9] = "September";
//monthCodes.Add(10, "October");
////cannot contain duplicates
//monthCodes.Add(10, "November");
//monthCodes.Add(12, "December");
//Console.WriteLine($"second month is {monthCodes[2]}");
//if (monthCodes.ContainsKey(13))
//{
// Console.WriteLine("Wow, extra month found");
//}
Dictionary <string, Pupil> pupilsByClasses = new Dictionary <string, Pupil>();
pupilsByClasses["1B"] = pupil1;
pupilsByClasses["2B"] = pupil2;
//Now lets take a look at custom collection
//MyFirstCourseCollection myFirstCourseCollection = new MyFirstCourseCollection();
//myFirstCourseCollection.Add(student1);
//myFirstCourseCollection.Add(student2);
//myFirstCourseCollection.Add(student3);
//foreach (Student element in myFirstCourseCollection)
//{
// Console.WriteLine(element.GroupName);
//}
//Now Lets take a look at generic class
MyGenericClass <int> intGenericClass = new MyGenericClass <int>(10);
int val = intGenericClass.genericMethod(200);
MyGenericClass <string> stringGenericClass = new MyGenericClass <string>("Hi ");
string strinValue = stringGenericClass.genericMethod("there");
MyFirstCourseCollection <MyGenericClass <int> > myFirstCourseCollection = new MyFirstCourseCollection <MyGenericClass <int> >();
myFirstCourseCollection.Add(intGenericClass);
foreach (MyGenericClass <int> myGenericClass in myFirstCourseCollection)
{
}
//Lets see how yield works
YieldDemo yieldDemo = new YieldDemo();
foreach (var weekDay in yieldDemo.GetWeekDays())
{
Console.WriteLine(weekDay);
}
Console.ReadLine();
}
static void Main(string[] args)
{
Student student1 = new Student()
{
GroupName = "LP1", Name = "Павло"
};
Student student2 = new Student()
{
GroupName = "LP1", Name = "Катерина"
};
Student student3 = new Student()
{
GroupName = "LP2", Name = "Андрій"
};
Student student4 = new Student()
{
GroupName = "LP2", Name = "Володя"
};
Student student5 = new Student()
{
GroupName = "LP3", Name = "Олексій"
};
Student student6 = new Student()
{
GroupName = "LP3", Name = "Денис"
};
Pupil pupil1 = new Pupil()
{
ClassName = "1B", Name = "Ira"
};
Pupil pupil2 = new Pupil()
{
ClassName = "2B", Name = "John"
};
//Imagine the situation that I have array of with 2 students and I want to add another student to this group
//Student[] students = new[] { student1, student2 };
// // ?? students.Add
// students[2] = student3;
Student[] students = new Student[10];
students[0] = student1;
students[1] = student2;
////foreach (Student student in students)
////{
//// Console.WriteLine(student.GroupName);
////}
//// //So the problem is that I have to think of the number of elements beforehand.
//// //Arraylist comes to the rescue
////ArrayList<string> list =new
////ArrayList arrayList = new ArrayList();
////arrayList.Add(student1);
////arrayList.Add(student2);
////arrayList.Add(pupil1);
////arrayList.Remove(student1);
////foreach (var item in arrayList)
////{
//// Student student = (Student) item;
//// Console.WriteLine(student.GroupName);
////}
//// //arrayList.Add(student3);
//// //But you can add not only student!! and this would break everything.
//// //Because the Arralist uses Object[] under the hood, the boxing/unboxing operation takes place
//// //arrayList.Add(pupil1);
//// //arrayList.Add(pupil2);
//// foreach (Student element in arrayList)
//// {
//// Console.WriteLine(element.GroupName);
//// }
//// //So how to ensure, that we can add dynamically items to collection and make sure that the type is checked, and without boxing and unboxing?
//// //Here comes to save a us: generics
////List<Pupil> pupils = new List<Pupil>();
////pupils.Add(pupil1);
////pupils.Add(pupil2);
////pupils.Remove(pupil1);
////var pupilAtFirstPosition = pupils.ElementAt(0);
////Queue<IHuman> studentsQueue = new Queue<IHuman>();
////studentsQueue.Enqueue(student1);
////studentsQueue.Enqueue(student2);
////studentsQueue.Enqueue(student3);
////studentsQueue.Enqueue(pupil1);
////var firstStudentFromQueue = studentsQueue.Dequeue();
////Console.WriteLine($"Only {studentsQueue.Count} left in the queue");
//Stack<Student> fullMashrutka = new Stack<Student>();
//fullMashrutka.Push(student1);
//fullMashrutka.Push(student2);
//fullMashrutka.Push(student3);
//var studentFromMarshrutka = fullMashrutka.Pop();
//Console.WriteLine($"First poped student {studentFromMarshrutka.Name}.");
//// //Lets imagine that we have many students, and we need to find the group, knowing the students name.
//// //Having a list of students, the algorithm should go through every student one by one.
//// //Dictionaries. Why dictionaries: are good, because they are at very efficiently finding an element
//string searchName = "Катерина";
//foreach (var student in students)
//{
// if (student.Name == searchName)
// {
// Console.WriteLine(student.GroupName);
// break;
// }
//}
//Dictionary<string, Student> studentByName = new Dictionary<string, Student>()
// {
// {"Катерина",student1},
// {"Павло",student2},
// {"Андрій",student3},
// {"Володя",student4},
// {"Олексій",student5},
// {"Денис",student6},
// };
// Console.WriteLine(studentByName[searchName]);
YieldDemo yieldDemo = new YieldDemo();
foreach (var day in yieldDemo.GetWeekDays())
{
}
yieldDemo.GetWeekDays();
GoodsCollection <Student> collection = new GoodsCollection <Student>();
collection.Add(student1);
collection.Add(student2);
collection.Add(student3);
foreach (var item in collection)
{
Console.WriteLine(item.ToString());
}
foreach (var item in collection)
{
Console.WriteLine(item.ToString());
}
MyGenericClass <Pupil> classGEneric = new MyGenericClass <Pupil>(pupil1);
// //Dictionaries allow having unique key, so next command would give runtime exception:
//// studentByName.Add("Катерина", studentFromMarshrutka);
//studentByName["new"] = new Student();
//// //Also we can have this syntax:
//// studentByName["New"] = new Student();
// Console.WriteLine(studentByName.ContainsKey("New"));
// //Now lets take a look at custom collection
// // In order to be able to use your Custom collection, it should implement the IEnumerable interface.
// //Also our new collection should allow Adding and Removing elements, and accessing them by index.
// StudentCollection coll=new
// //MyFirstCourseCollection myFirstCourseCollection = new MyFirstCourseCollection();
// //myFirstCourseCollection.Add(student1);
// //myFirstCourseCollection.Add(student2);
// //myFirstCourseCollection.Add(student3);
// //foreach (Student element in myFirstCourseCollection)
// //{
// // Console.WriteLine(element.GroupName);
// //}
// //Now Lets take a look at generic class
// MyGenericClass<int> intGenericClass = new MyGenericClass<int>(10);
// int val = intGenericClass.genericMethod(200);
// MyGenericClass<string> stringGenericClass = new MyGenericClass<string>("Hi ");
// string strinValue = stringGenericClass.genericMethod("there");
// MyFirstCourseCollection<MyGenericClass<int>> myFirstCourseCollection = new MyFirstCourseCollection<MyGenericClass<int>>();
// myFirstCourseCollection.Add(intGenericClass);
// foreach (MyGenericClass<int> myGenericClass in myFirstCourseCollection)
// {
// }
// //Lets see how yield works
// YieldDemo yieldDemo = new YieldDemo();
// foreach (var weekDay in yieldDemo.GetWeekDays())
// {
// Console.WriteLine(weekDay);
// }
Console.ReadLine();
}
