static void Main(string[] args)
{
Dissertation diss = new Dissertation();
Diary dy = new Diary();
Book bdiss = diss;
Book bdy = dy;
}
static void Main(string[] args)
{
Dissertation diss = new Dissertation();
IFlippable fdiss = diss;
Book bdiss = diss;
fdiss.CurrentPage = 42;
Console.WriteLine(fdiss == bdiss);
}
static void Main(string[] args)
{
Dissertation diss1 = new Dissertation();
Dissertation diss2 = diss1;
diss1.CurrentPage = 0;
diss2.CurrentPage = 16;
Console.WriteLine(diss1.CurrentPage);
Console.WriteLine(diss2.CurrentPage);
}
static void Main(string[] args)
{
Dissertation diss1 = new Dissertation(32, "Anna Knowles-Smith", "Refugees and Theatre");
Dissertation diss2 = new Dissertation(19, "Lajos Kossuth", "Shiny Happy People");
Diary dy1 = new Diary(48, "Anne Frank", "The Diary of a Young Girl");
Diary dy2 = new Diary(23, "Lili Elbe", "Man into Woman");
Book[] books = { diss1, diss2, dy1, dy2 };
foreach (Book b in teste)
{
consolConsole.WriteLine(b.Title);
}
}
static void Main(string[] args)
{
// Two references to the same object
Dissertation diss1 = new Dissertation();
Dissertation diss2 = diss1;
diss1.CurrentPage = 31;
diss1.Flip();
Console.WriteLine(diss1.CurrentPage);
Console.WriteLine(diss2.CurrentPage);
// Both print 32
// Referential equality when comparing reference types
Dissertation d1 = new Dissertation(50);
Dissertation d2 = new Dissertation(50);
Console.WriteLine(d1 == d2);
// Prints false
// Value equality when comparing value types
int int1 = 6;
int int2 = 6;
Console.WriteLine(int1 == int2);
// Prints true
// Reference to object with implemented interface
Dissertation diss = new Dissertation(50);
IFlippable f = diss;
diss.Flip();
f.Flip();
Console.WriteLine(diss.Define());
// This causes an error!
// Console.WriteLine(f.Define());
// Reference to object with inherited superclass
Dissertation diss3 = new Dissertation(19, "Lajos Kossuth", "Shiny Happy People");
Book bdiss3 = diss3;
Console.WriteLine(diss3.Author);
Console.WriteLine(bdiss3.Author);
Console.WriteLine(diss3.Define());
// This causes an error!
// bdiss3.Define();
// Arrays of references
IFlippable[] flippers = new IFlippable[] { new Dissertation(), new Diary() };
foreach (IFlippable flipper in flippers)
{
flipper.Flip();
}
// Same reference type but different behavior (using virtual/override)
Book bdiss = new Dissertation();
Book bk = new Book();
Console.WriteLine(bdiss.Stringify());
Console.WriteLine(bk.Stringify());
// Output:
// "This is a Dissertation object!"
// "This is a Book object!"
// Null reference
Diary dy = null;
// Unassigned reference
Diary dy2;
// Unassigned references in array
Diary[] dys = new Diary[5];
}