12-11 Object-oriented-encapsulation, constructors

Iii. properties of Classes--encapsulation fields

Consists of two methods:

1. Read accessor: Get (take value)

2. Write accessor: Set (assigned value)

= = Package = =
private string _nihao;//The original ordinary variable private, by right---refactoring--encapsulation field implementation;
/*{
Get{return _name;} By default there are always get and set two methods, but the characteristics of information are hidden all the time;
Set{_name = value;}
}*/
Encapsulate Fields
public string name//the property after encapsulation.
Equivalent to the _name of the messenger of the intermediary, the package will be the original hidden variable properties displayed, two methods: Get,set.
{
Get// read accessor, fetch, return value of _name, procedure of value
{
Return _nihao;//return is the value of itself
}
Set// write accessor, setting the value of Name assignment to _name, the process of assigning a value
{
int sum = 0;
for (int i = 1; i <=; i++)
{
sum = sum + i;
}
Value = Sum. ToString ();
_nihao = value;

}

Called in the main function:

= = Package = =
FengZhuang p = new FengZhuang ();//must initialize new to invoke
Console.WriteLine ("Input:");
P.name = Console.ReadLine ();
Console.WriteLine (P.name);
Console.ReadLine ();

This will return the value.

Four, the constructor function

Definition: When an object is created with the New keyword, a special function is called automatically , which is the constructor of the class.

In C #, the constructor of a class is the same as the class name, and there is no return value.

Class student

{

Public student ()//constructor name of the same name, when the main function is called, as long as the initialization of new, the constructor can be automatically called.

{

Method

}

}

Exercise

///Student course, cycle through student information, output average score, highest score, lowest score, sort; (using object-oriented)
Console.Write ("Please enter student number:");
int n = Int. Parse (Console.ReadLine ());
Console.WriteLine ("Please enter student number, name, score");
ArrayList arr = new ArrayList ();//define a collection,
for (int i = 0; i < n; i++)
{
Student s = new student ();// Each loop in the For loop must be reinitialized, or the previous assignment will be replaced, with the last assignment
Console.Write ("study number:");
S.code = Int. Parse (Console.ReadLine ());
Console.Write ("Name:");
S.name = Console.ReadLine ();
Console.Write ("Score:");
S.score = Decimal. Parse (Console.ReadLine ());
Arr. ADD (s);//The properties of the class are all placed in the collection
}
//for the total score;
Decimal sum = 0;
for (int i = 0; i < n; i++)
{
Student AVGs = (student) arr[i];//This step is to cast the collection arr to the student class.
Sum + = AVGs. score;//total score
}

//for nested Loops bubble sort, highest score, Min.
for (int i = 0; i < n; i++)
{
for (int j = i; J < N; j + +)
{
Student S 1 = (student) arr[i];//the collection to the Student class by index and assigns the values in the collection to S1;
Student s2 = (student) arr[j];
if (S1. Score < S2. Score)//depending on the score, arrange
{
Student zhong = new Student () in the order of first large and small,  // bubble sort (focus)
Zhong = s1;< br> Arr[i] = s2;//means to assign a larger value to the I index
arr[j] = zhong;
}
}
}

Print output
Console.WriteLine ("Total score: {0}", sum);
Console.WriteLine ("Average score: {0}", sum/n);
Student SS1 = (student) arr[0];
Console.WriteLine ("Name: {0} Highest score: {1}", SS1. Name,ss1. Score);
int m=n-1;
Student SS2 = (student) arr[m];
Console.WriteLine ("Name: {0} min: {1}", SS2. Name, SS2. Score);
Sort by score, for loop
Console.WriteLine ("The result list of this class is as follows: *****************************");
for (int i = 0; i < n; i++)
{
Student AVGs = (student) arr[i];
Console.WriteLine ("Rank number of name score");
Console.WriteLine ("{0} {1} {2} {3}", I+1,avgs. Code,avgs. Name,avgs. Score);
}
Console.ReadLine ();

12-11 Object-oriented-encapsulation, constructors