浅拷贝-基础理解

public class CopyTest
{
public static void TestCopy()
{
/*
* 　深拷贝：指的是拷贝一个对象时，不仅仅把对象的引用进行复制，还把该对象引用的值也一起拷贝。
* 　       深拷贝之后的对象是相互独立的，人生有了独立的轨迹，不在互相影响。
* 　
*   浅拷贝：指的是拷贝一个对象时，仅仅拷贝对象的引用进行拷贝，但是拷贝对象和源对象还是引用同一份实体。
*          浅拷贝的对象似与影子，都是同一个实体的，随便动一个，其他都会保持一致
*/
HotDrink hotDrink1 = new HotDrink() {  Milk=5, Sugar=3};
HotDrink hotDrink2 = hotDrink1;
HotDrink hotDrink3 = new HotDrink();
hotDrink3 = hotDrink1;
HotDrink hotDrink4 = new HotDrink();
hotDrink4.Milk = hotDrink1.Milk;
hotDrink4.Sugar = hotDrink1.Sugar;

Console.WriteLine("初始化值：");
Console.WriteLine("         hotDrink2 = hotDrink1;");
Console.WriteLine("         hotDrink2 = hotDrink1;");
Console.WriteLine("         HotDrink hotDrink3 = new HotDrink(); hotDrink3 = hotDrink1;");
Console.WriteLine("         HotDrink hotDrink4 = new HotDrink(); hotDrink4.Milk = hotDrink1.Milk;");

Console.WriteLine("hotDrink1 的 Milk = {0}，Sugar = {1}", hotDrink1.Milk, hotDrink1.Sugar);
Console.WriteLine("hotDrink2 的 Milk = {0}，Sugar = {1}", hotDrink2.Milk, hotDrink2.Sugar);
Console.WriteLine("hotDrink3 的 Milk = {0}，Sugar = {1}", hotDrink3.Milk, hotDrink3.Sugar);
Console.WriteLine("hotDrink4 的 Milk = {0}，Sugar = {1}", hotDrink4.Milk, hotDrink4.Sugar);
Console.WriteLine();

hotDrink2.Milk = 5 * 2;
hotDrink2.Sugar = 3 * 2;

hotDrink3.Milk = 5 * 3;
hotDrink3.Sugar = 3 * 3;

hotDrink4.Milk = 5 * 4;
hotDrink4.Sugar = 3 * 4;

Console.WriteLine("hotDrink1 的 Milk = {0}，Sugar = {1}",hotDrink1.Milk,hotDrink1.Sugar);
Console.WriteLine("hotDrink2 的 Milk = {0}，Sugar = {1}", hotDrink2.Milk, hotDrink2.Sugar);
Console.WriteLine("hotDrink3 的 Milk = {0}，Sugar = {1}", hotDrink3.Milk, hotDrink3.Sugar);
Console.WriteLine("hotDrink4 的 Milk = {0}，Sugar = {1}", hotDrink4.Milk, hotDrink4.Sugar);
Console.WriteLine();
hotDrink1.Milk = 11;
hotDrink1.Sugar = 4;

hotDrink4.Milk = 44;
hotDrink4.Sugar = 88;

Console.WriteLine("hotDrink1 的 Milk = {0}，Sugar = {1}", hotDrink1.Milk, hotDrink1.Sugar);
Console.WriteLine("hotDrink2 的 Milk = {0}，Sugar = {1}", hotDrink2.Milk, hotDrink2.Sugar);
Console.WriteLine("hotDrink3 的 Milk = {0}，Sugar = {1}", hotDrink3.Milk, hotDrink3.Sugar);
Console.WriteLine("hotDrink4 的 Milk = {0}，Sugar = {1}", hotDrink4.Milk, hotDrink4.Sugar);

Console.WriteLine();
hotDrink4.Milk = 11;
hotDrink4.Sugar = 4;

Console.WriteLine("hotDrink1 的 Milk = {0}，Sugar = {1}", hotDrink1.Milk, hotDrink1.Sugar);
Console.WriteLine("hotDrink4 的 Milk = {0}，Sugar = {1}", hotDrink4.Milk, hotDrink4.Sugar);

Console.WriteLine("hotDrink1 equals(==) hotDrink4? {0}", hotDrink1 == hotDrink4);
Console.WriteLine();
Console.WriteLine("hotDrink1 equals(Equals) hotDrink4? {0}", hotDrink1.Equals( hotDrink4));
Console.WriteLine();

Console.WriteLine("hotDrink1 equals(==) hotDrink2? {0}", hotDrink1 == hotDrink2);
Console.WriteLine();
Console.WriteLine("hotDrink1 equals(Equals) hotDrink4? {0}", hotDrink1.Equals(hotDrink2));

Console.WriteLine("hotDrink2,hotDrink3都是浅拷贝（shallow copy，System.Object 的MemberwiseClone()），操作hotDrink1,hotDrink2,hotDrink3任意一个值，都会一起更改，其地址一样。");
Console.WriteLine("hotDrink4表现和深拷贝一致（deep copy），简单可以通过ICloneable接口实现，复杂的可以通过反射、序列化，表达式树来实现深拷贝。");

Console.ReadLine();
}
}