public static void Main (string[] args)
{
var person = new Person ();
Console.WriteLine ("ToString: {0}", person.ToString ());
Console.WriteLine ("Hash Code: {0}", person.GetHashCode ());
Console.WriteLine ("Type: {0}", person.GetType ());
Person person2 = person;
object obj = person;
//Are the references pointing to the same object in memory?
if (obj.Equals (person) && person2.Equals (obj)) {
Console.WriteLine("Same Instance");
var pers1 = new Person("Homer", "Simpson", 50);
var pers2 = new Person("Homer", "Simpson", 50);
Console.WriteLine("pers1.ToString() = {0}",pers1.ToString());
Console.WriteLine("pers2.ToString() = {0}",pers2.ToString());
Console.WriteLine("pers1 = pers2: {0}", pers1.Equals(pers2));
Console.WriteLine("Same hash codes? : {0}", pers1.GetHashCode() == pers2.GetHashCode());
Console.ReadLine();
}
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("**** Fun with System.Object ****\n");
Person p1 = new Person("Homer", "Simpson", 50);
Person p2 = new Person("Homer", "Simpson", 50);
Console.WriteLine("p1.ToString()={0}", p1.ToString());
Console.WriteLine("p2.ToString()={0}", p2.ToString());
Console.WriteLine("p1=p2?:{0}", p1.Equals(p2));
Console.WriteLine("Same hash codes?:{0}", p1.GetHashCode() == p2.GetHashCode());
Console.WriteLine();
p2.Age = 45;
Console.WriteLine("p1.toString()={0}", p1.ToString());
Console.WriteLine("p2.ToString()={0}", p2.ToString());
Console.WriteLine("p1 = p2?:{0}", p1.Equals(p2));
Console.WriteLine("Same hash codes?:{0}", p1.GetHashCode() == p2.GetHashCode());
Console.WriteLine();
StaticMembersOfObject();
Console.ReadLine();
}
static void StaticMembersOfObject()
{
// Static members of System.Object.
Person pt = new Person("Sally", "Jones", 4);
Person ps = new Person("Sally", "Jones", 4);
Console.WriteLine("Pt and Ps have the same state: {0}", object.Equals(pt, ps));
Console.WriteLine("Pt and Ps are pointing to same object: {0}", object.ReferenceEquals(pt, ps));
}
static void StaticMethodsOfObject()
{
Person p3 = new Person("Sally", "Jones", 4);
Person p4 = new Person("Sally", "Jones", 4);
Console.WriteLine("P3 and P4 have same state: {0}", object.Equals(p3, p4));
Console.WriteLine("P3 and P4 are pointing to same object: {0}", object.ReferenceEquals(p3, p4));
}
static void StaticMembersOfObject() {
//static members of System.Object
Person p3 = new Person("Sally", "Jones", 4);
Person p4 = new Person("Sally", "Jones", 4);
Console.WriteLine("p3 and p4 have same state: {0}", object.Equals(p3, p4));
Console.WriteLine("p3 and p4 are pointing to same object: {0}",
object.ReferenceEquals(p3, p4));
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with System.Object *****\n");
Person p4 = new Person();
// Use inherited members of System.Object.
Console.WriteLine("ToString: {0}", p4.ToString());
Console.WriteLine("Hash Code: {0}", p4.GetHashCode());
Console.WriteLine("type: {0}", p4.GetType());
// Make some other references to p1.
Person p3 = p4;
object o = p3;
// Are the references pointing to the same object in memory?
if (o.Equals(p4) && p3.Equals(o))
{
Console.WriteLine("Same instance!");
}
Console.WriteLine();
// NOTE: We want these to be identical to test
// the Equals() and GetHashCode() methods.
Person p1 = new Person("Homer", "Simpson", 50);
Person p2 = new Person("Homer", "Simpson", 50);
// Get stringified version of objects.
Console.WriteLine("p1.ToString() = {0}", p1.ToString());
Console.WriteLine("p2.ToString() = {0}", p2.ToString());
// Test overridden Equals().
Console.WriteLine("p1 = p2?: {0}", p1.Equals(p2));
// Test overridden Equals()
Console.WriteLine("p1 = p2: {0}", p1.Equals(p2));
// Test hash codes.
Console.WriteLine("Same hash codes?: {0}", p1.GetHashCode() == p2.GetHashCode());
Console.WriteLine();
// Change age of p2 and test again.
p2.Age = 45;
Console.WriteLine("p1.ToString() = {0}", p1.ToString());
Console.WriteLine("p2.ToString() = {0}", p2.ToString());
Console.WriteLine("p1 = p2?: {0}", p1.Equals(p2));
Console.WriteLine("Same hash codes? {0}", p1.GetHashCode() == p2.GetHashCode());
Console.WriteLine();
StaticMembersOfObject();
Console.ReadKey();
}
static void Main(string[] args)
{
Person p1 = new Person();
Console.WriteLine("ToString: {0}", p1.ToString());
Console.WriteLine("Hash Code: {0}", p1.GetHashCode());
Console.WriteLine("Type: {0}", p1.GetType());
Person p2 = p1;
object o = p2;
if (o.Equals(p1) && p2.Equals(o))
{
Console.WriteLine("Same instance");
}
Person pNull = null;
Console.WriteLine();
Console.WriteLine("is pNull a person {0}", pNull is Person);
Console.WriteLine("is p1 equal to null {0}", p1.Equals(null));
Console.WriteLine("is empty string equal to null {0}", "" == null);
Console.WriteLine();
Person p11 = new Person("Homer", "Simpson", 50);
Person p12 = new Person("Homer", "Simpson", 50);
Console.WriteLine("ToString: {0}", p11.ToString());
Console.WriteLine("p11.Hash Code: {0}", p11.GetHashCode());
Console.WriteLine("p12.Hash Code: {0}", p12.GetHashCode());
Console.WriteLine("is p11 equal to p12 {0}", p11.Equals(p12));
p12.Age = 45;
Console.WriteLine("is p11 equal to p12 {0}", p11.Equals(p12));
Console.WriteLine("p11.Hash Code: {0}", p11.GetHashCode());
Console.WriteLine("p12.Hash Code: {0}", p12.GetHashCode());
Console.WriteLine();
Console.WriteLine("=> static object methods");
Person p3 = new Person("Sally", "Jones", 4);
Person p4 = new Person("Sally", "Jones", 4);
Console.WriteLine("object.Equals {0}", object.Equals(p3, p4));
Console.WriteLine("object.ReferenceEquals {0}", object.ReferenceEquals(p3, p4));
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with System.Object *****\n");
////use inherited members of System.Object...
//Console.WriteLine("ToString: {0}", p1.ToString());
//Console.WriteLine("Hash Code: {0}", p1.GetHashCode());
//Console.WriteLine("Type: {0}", p1.GetType());
////make some other refs to p1
//Person p2 = p1;
//object o = p2;
////are these refs pointing to the same obj in memory?
//if (o.Equals(p1) && p2.Equals(o))
//{
// Console.WriteLine("Same instance!");
//}
//make 2 identical Persons to test Equals() and GetHashCode()
Person p1 = new Person("Homer", "Simpson", 50);
Person p2 = new Person("Homer", "Simpson", 50);
//get stringified versions of those objs
Console.WriteLine("p1.ToString() = {0}", p1.ToString());
Console.WriteLine("p2.ToString() = {0}", p2.ToString());
//test overriden Equals()
Console.WriteLine("p1 = p2?: {0}", p1.Equals(p2));
//test hash codes
Console.WriteLine("same hash codes?: {0}", p1.GetHashCode()==
p2.GetHashCode());
Console.WriteLine();
//change age of p2 and retest
p2.Age = 45;
Console.WriteLine("p1.ToString() = {0}", p1.ToString());
Console.WriteLine("p2.ToString() = {0}", p2.ToString());
Console.WriteLine("p1 = p2?: {0}", p1.Equals(p2));
Console.WriteLine("same hash codes?: {0}", p1.GetHashCode() ==
p2.GetHashCode());
Console.WriteLine();
StaticMembersOfObject();
Console.ReadLine();
}
public static void Main (string[] args)
{
var person = new Person ();
Console.WriteLine ("ToString: {0}", person.ToString ());
Console.WriteLine ("Hash Code: {0}", person.GetHashCode ());
Console.WriteLine ("Type: {0}", person.GetType ());
Person person2 = person;
object obj = person;
//Are the references pointing to the same object in memory?
if (obj.Equals (person) && person2.Equals (obj)) {
Console.WriteLine("Same Instance");
}
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("Fun with System.Object");
Person p1 = new Person();
Person p2 = p1;
object o = p2;
if (o.Equals(p1) && p2.Equals(o))
{
Console.WriteLine("Same Instance");
}
Console.WriteLine("ToString: {0}", p1.ToString());
Console.WriteLine("GetHashCode: {0}", p1.GetHashCode());
Console.WriteLine("GetType: {0}", p1.GetType());
Console.ReadLine();
}
static void Main( string[] args )
{
Console.WriteLine("***** Fun with System.Object *****\n");
// NOTE: We want these to be identical to test
// the Equals() and GetHashCode() methods.
Person p1 = new Person("Homer", "Simpson", 50);
Person p2 = new Person("Homer", "Simpson", 50);
// Get stringified version of objects.
Console.WriteLine("p1.ToString() = {0}", p1.ToString());
Console.WriteLine("p2.ToString() = {0}", p2.ToString());
// Test Overridden Equals()
Console.WriteLine("p1 = p2?: {0}", p1.Equals(p2));
// Test hash codes.
Console.WriteLine("Same hash codes?: {0}", p1.GetHashCode() == p2.GetHashCode());
Console.WriteLine();
// Change age of p2 and test again.
p2.Age = 45;
Console.WriteLine("p1.ToString() = {0}", p1.ToString());
Console.WriteLine("p2.ToString() = {0}", p2.ToString());
Console.WriteLine("p1 = p2?: {0}", p1.Equals(p2));
Console.WriteLine("Same hash codes?: {0}", p1.GetHashCode() == p2.GetHashCode());
Console.WriteLine();
StaticMembersOfObject();
Console.ReadLine();
}
