namespace HelloWorld;
 
interface
 
type
  HelloClass = class
  public
    class method Main; 
  end;
 
implementation
 
class method HelloClass.Main;
begin
  System.Console.WriteLine('Hello World!');
end;
 
end.

namespace GenericContainer;
 
interface
 
type
  TestApp = class
  public
    class method Main;
  end;
 
  Person = class
  public
    property FirstName: String;
    property LastName: String;      
  end;        
 
implementation
 
uses 
  System.Collections.Generic;
 
class method TestApp.Main;
begin
  var myList := new List<Person>; //type inference
  myList.Add(new Person(FirstName := 'John', LastName := 'Doe'));  
  myList.Add(new Person(FirstName := 'Jane', LastName := 'Doe'));
  myList.Add(new Person(FirstName := 'James', LastName := 'Doe'));  
  Console.WriteLine(myList1.FirstName);  //No casting needed
  Console.ReadLine;        
end;
 
end.

namespace GenericMethodTest;
 
interface
 
type
GenericMethodTest = static class
public
  class method Main;
private
  class method Swap<T>(var left, right : T);
  class method DoSwap<T>(left, right : T);
end;
 
implementation
 
class method GenericMethodTest.DoSwap<T>(left, right : T);
begin
  var a := left;
  var b := right;
  Console.WriteLine('Type: {0}', typeof(T));
  Console.WriteLine('-> a = {0}, b = {1}', a , b);
  Swap<T>(var a, var b);
  Console.WriteLine('-> a = {0}, b = {1}', a , b);
end;
 
class method GenericMethodTest.Main;
begin
  var a := 23;// type inference
  var b := 15;
  DoSwap<Integer>(a, b); // no downcasting to Object in this method.
 
  var aa := 'abc';// type inference
  var bb := 'def';
  DoSwap<String>(aa, bb); // no downcasting to Object in this method.
 
  DoSwap(1.1, 1.2); // type inference for generic parameters
  Console.ReadLine();
end;
 
class method GenericMethodTest.Swap<T>(var left, right : T);
begin
  var temp := left;
  left:= right;
  right := temp;
end;
 
end.

case aClassID.ToUpper of
   'XYZ': result := TMyXYZClass;
   'ABC': result := TMyOtherClass;
else raise new Exception('Invalid Class ID');
end;

case aClass type of
   TMyXYZClass: TMyXYZClass(aClass).DoSomething;
   TMyOtherClass: TMyOtherClass(aClass).DoSomethingElse;
else raise new Exception('Invalid Class Reference');
end;