static void Main(string[] args)
{
Guy joe1 = new Guy("Joe", 37, 100);
Guy joe2 = joe1;
Console.WriteLine(Object.ReferenceEquals(joe1, joe2)); // True
Console.WriteLine(joe1.Equals(joe2)); // True
Console.WriteLine(Object.ReferenceEquals(null, null)); // True
joe2 = new Guy("Joe", 37, 100);
Console.WriteLine(Object.ReferenceEquals(joe1, joe2)); // False
Console.WriteLine(joe1.Equals(joe2)); // False
joe1 = new EquatableGuy("Joe", 37, 100);
joe2 = new EquatableGuy("Joe", 37, 100);
Console.WriteLine(Object.ReferenceEquals(joe1, joe2)); // False
Console.WriteLine(joe1.Equals(joe2)); // True
joe1.GiveCash(50);
Console.WriteLine(joe1.Equals(joe2)); // False
joe2.GiveCash(50);
Console.WriteLine(joe1.Equals(joe2)); // True
List<Guy> guys = new List<Guy>() {
new Guy("Bob", 42, 125),
new EquatableGuy(joe1.Name, joe1.Age, joe1.Cash),
new Guy("Ed", 39, 95)
};
Console.WriteLine(guys.Contains(joe1)); // True
Console.WriteLine(joe1 == joe2); // False
joe1 = new EquatableGuyWithOverload(joe1.Name, joe1.Age, joe1.Cash);
joe2 = new EquatableGuyWithOverload(joe1.Name, joe1.Age, joe1.Cash);
Console.WriteLine(joe1 == joe2); // False
Console.WriteLine(joe1 != joe2); // True
Console.WriteLine((EquatableGuyWithOverload)joe1 ==
(EquatableGuyWithOverload)joe2); // True
Console.WriteLine((EquatableGuyWithOverload)joe1 !=
(EquatableGuyWithOverload)joe2); // False
joe2.ReceiveCash(25);
Console.WriteLine((EquatableGuyWithOverload)joe1 ==
(EquatableGuyWithOverload)joe2); // False
Console.WriteLine((EquatableGuyWithOverload)joe1 !=
(EquatableGuyWithOverload)joe2); // True
Console.ReadKey();
}