static void Main(string[] args)
{
/*var list = new ArrayList();//前者是装拆箱后者是泛型var list = new List<int>();
* list.Add(44);
* int il = (int)list[0];//前者是装拆箱后者是泛型int i1=list[0];
* foreach (int i2 in list)
* {
* Console.WriteLine(i2);
* }*/
/*var list1 = new LList();
* list1.AddLast(2);
* list1.AddLast(4);
* list1.AddLast("6");
*
* foreach (int i in list1)
* {
* Console.WriteLine(i);
* }
*
* var list1 = new LList();
* list1.AddLast(2);
* list1.AddLast(4);
* list1.AddLast("6");
*
* foreach (int i in list1)
* {
* Console.WriteLine(i);
* }
*
* var list2 = new LList<int>();
* list2.AddLast(1);
* list2.AddLast(3);
* list2.AddLast(5);
*
* foreach (int i in list2)
* {
* Console.WriteLine(i);
* }
*
* var list3 = new LList<string>();
* list3.AddLast("2");
* list3.AddLast("four");
* list3.AddLast("foo");
*
* foreach (string s in list3)
* {
* Console.WriteLine(s);
* }*/
/*var dm = new DocumentManager<Document>();
* dm.AddDocument(new Document("Title A", "Sample A"));
* dm.AddDocument(new Document("Title B", "Sample B"));
* dm.DispalyAllDocuments();
* if(dm.IsDocumentAvailable)
* {
* Document d = dm.GetDocument();
* Console.WriteLine(d.Content);
* }*/
StaticDemo <string> .x = 4;
StaticDemo <int> .x = 5;
Console.WriteLine(StaticDemo <int> .x);
var r = new Rectangle {
Width = 5, Height = 2.5
};
Console.WriteLine(r.ToString());
//协变：把返回值赋予IIndex<Rectangle>类型的变量rectangle，因为协变，所以可以把值赋予IIndex<Shape>类型的变量
IIndex <Rectangle> rectangles = RectangleCollection.GetRectangle();
IIndex <Shape> shapes = rectangles;
for (int i = 0; i < shapes.Count; i++)
{
Console.WriteLine(shapes[i]);
}
//抗变：IDisplay<T>是抗变的，可以把结果赋予IDisplay<Rectangle>
IDisplay <Shape> shapeDisplay = new ShapeDisplay();
IDisplay <Rectangle> rectangleDisplay = shapeDisplay;
rectangleDisplay.Show(rectangles[0]);
var accounts = new List <Account>()
{
new Account("Christian", 1500),
new Account("Stephanie", 2200),
new Account("Angela", 1800),
new Account("Matthias", 2400),
};
decimal amount = Algorithm.AccumulateSimple(accounts);
Console.WriteLine(amount);
//decimal Amount = Algorithm.Accumulate<Account>(accounts);
//decimal Amount = Algorithm.Accumulate<Account, decimal>(accounts, (item, sum) => sum += item.Balance);
var test = new MethodOverloads();
test.Foo(33);
test.Foo("abc");
test.Bar(44);
}
public static RectangleCollection GetRectangle()
{
return(coll ?? (coll = new RectangleCollection()));
}
