添加Lesson22

2025-09-17 09:49:32 +08:00
parent 4cf9bb6c97
commit 839ff77b59
5 changed files with 231 additions and 0 deletions
@@ -43,6 +43,16 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson19_多态-接口", "L
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson19_多态-接口练习", "Lesson19_多态-接口练习\Lesson19_多态-接口练习.csproj", "{D511EDF3-7769-45BB-8304-3081918FA633}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson20_多态-密封方法", "Lesson20_多态-密封方法\Lesson20_多态-密封方法.csproj", "{9F2767ED-D9FE-97EB-0B0D-0A8B46435FA3}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson21_面向对象相关-命名空间", "Lesson21_面向对象相关-命名空间\Lesson21_面向对象相关-命名空间.csproj", "{6445CCF9-8002-CF07-83FE-0CEE784342B1}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson21_面向对象相关-命名空间练习", "Lesson21_面向对象相关-命名空间练习\Lesson21_面向对象相关-命名空间练习.csproj", "{25E43CAE-4D61-07A2-5740-781F60FB8531}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson22_面向对象相关-万物之父中的方法", "Lesson22_面向对象相关-万物之父中的方法\Lesson22_面向对象相关-万物之父中的方法.csproj", "{E8C88C85-C2E7-4E6F-BDB1-806CB078EED6}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson22_面向对象相关-万物之父中的方法练习", "Lesson22_面向对象相关-万物之父中的方法练习\Lesson22_面向对象相关-万物之父中的方法练习.csproj", "{0AF0A54F-67BE-46A2-B79D-813ACB6A9EF3}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -129,6 +139,26 @@ Global
 		{D511EDF3-7769-45BB-8304-3081918FA633}.Debug|Any CPU.Build.0 = Debug|Any CPU
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 		{D511EDF3-7769-45BB-8304-3081918FA633}.Release|Any CPU.Build.0 = Release|Any CPU
+		{9F2767ED-D9FE-97EB-0B0D-0A8B46435FA3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9F2767ED-D9FE-97EB-0B0D-0A8B46435FA3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9F2767ED-D9FE-97EB-0B0D-0A8B46435FA3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9F2767ED-D9FE-97EB-0B0D-0A8B46435FA3}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6445CCF9-8002-CF07-83FE-0CEE784342B1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6445CCF9-8002-CF07-83FE-0CEE784342B1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6445CCF9-8002-CF07-83FE-0CEE784342B1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6445CCF9-8002-CF07-83FE-0CEE784342B1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{25E43CAE-4D61-07A2-5740-781F60FB8531}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{25E43CAE-4D61-07A2-5740-781F60FB8531}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{25E43CAE-4D61-07A2-5740-781F60FB8531}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{25E43CAE-4D61-07A2-5740-781F60FB8531}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E8C88C85-C2E7-4E6F-BDB1-806CB078EED6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E8C88C85-C2E7-4E6F-BDB1-806CB078EED6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E8C88C85-C2E7-4E6F-BDB1-806CB078EED6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E8C88C85-C2E7-4E6F-BDB1-806CB078EED6}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0AF0A54F-67BE-46A2-B79D-813ACB6A9EF3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0AF0A54F-67BE-46A2-B79D-813ACB6A9EF3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0AF0A54F-67BE-46A2-B79D-813ACB6A9EF3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0AF0A54F-67BE-46A2-B79D-813ACB6A9EF3}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Lesson22_面向对象相关_万物之父中的方法</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
@@ -0,0 +1,99 @@
+namespace Lesson22_面向对象相关_万物之父中的方法
+{
+    class Test
+    {
+        public int i = 1;
+        public Test2 t2 = new Test2();
+
+        public Test Clone()
+        {
+            return MemberwiseClone() as Test;
+        }
+
+        //public override bool Equals(object obj)
+        //{
+        //    if (obj is Test t)
+        //    {
+        //        return this.i == t.i && this.t2.i == t.t2.i;
+        //    }
+        //    return false;
+        //}//重写Equals方法 用于比较值是否相等
+    }
+    class Test2
+    {
+        public int i = 2;
+    }
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            #region 知识回顾
+            //万物之父object
+            //他是所有类的基类 引用类型
+            //可以用里氏替换原则装载一切对象
+            //存在装箱和拆箱
+            #endregion
+
+            #region 知识点一 object中的静态方法
+            //静态方法
+            //Equals 判断两个对象是否相等
+            //最终的判断权交给最左侧的Equals方法
+            //不管值类型引用类型都会按照左侧Equals方法规则来进行比较
+            Console.WriteLine(Object.Equals(1,1));//返回Ture
+            Test t = new Test();
+            Test t2 = new Test();
+            Console.WriteLine(Equals(t,t2));//false因为地址不同
+            Test t3 = t;
+            Console.WriteLine(Equals(t,t3));//这样才为True
+            //ReferencesEquals
+            //用来哦比较引用类型
+            //值类型对象使用该方法返回的结果永远是false
+            Console.WriteLine(ReferenceEquals(1,1));//false
+            #endregion
+
+            #region 知识点二 object中的成员方法
+            //普通方法
+            //GetType 获取当前对象的类型信息
+            //这是在反射中非常重要的一个方法
+            //通过Type结合反射可以做很多关于对象的操作
+            t = new Test();
+            Type type = t.GetType();
+            //MemberwiseClone
+            //用于获取该对象的浅拷贝对象
+            //口语化的意思就是 克隆一个一模一样的对象
+            //既 新建一个对象 然后把当前对象的值全部赋值给新对象
+            //注意：改后者的引用类型值会影响前者
+            Console.WriteLine("克隆前：");
+            Test tx = t.Clone();
+            Console.WriteLine(t.i);//1
+            Console.WriteLine(t.t2.i);//2
+            Console.WriteLine(tx.i);//1
+            Console.WriteLine(tx.t2.i);//2
+            Console.WriteLine("改变克隆信息后");
+            tx.i = 20;
+            tx.t2.i = 21;
+            Console.WriteLine(t.i);//1
+            Console.WriteLine(t.t2.i);//21新对象中的引用类型成员被改变 原对象也被改变了
+            Console.WriteLine(tx.i);//20
+            Console.WriteLine(tx.t2.i);//21
+            #endregion
+
+            #region 知识点三 object中的虚方法
+            //虚方法Equals
+            //默认实现还是比较两者是否为同一个引用，相当于ReferenceEquals
+            //但是微软在所有值类型的基类System.ValueType中重写了该方法，用来比较值类型的值是否相等
+
+            //虚方法GetHashCode
+            //该方法是获取对象哈希值的一个方法
+            //（一种通过算法算出的，表示唯一对象的编码，不同对象哈希码有可能一样，具体值根据算法决定）
+            //我们可以通过重写该方法来实现我们自己的哈希算法，正常情况下，使用极少，基本不用
+
+            //虚方法ToString
+            //该方法用于返回当前对象代表的字符串信息，可以重写他来定义自己的字符串转换规则
+            //非常常用。当我们调用Console.WriteLine打印一个对象时，实际上调用的就是该对象的ToString方法
+            Console.WriteLine(t);
+            #endregion
+
+        }
+    }
+}
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>Lesson22_面向对象相关_万物之父中的方法练习</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
@@ -0,0 +1,80 @@
+using System.Xml.Linq;
+
+namespace Lesson22_面向对象相关_万物之父中的方法练习
+{
+    class Player
+    {
+        private string name;
+        private int hp, atk, def, dodge;
+
+        public Player(string name, int hp, int atk, int def, int dodge)
+        {
+            this.name = name;
+            this.hp = hp;
+            this.atk = atk;
+            this.def = def;
+            this.dodge = dodge;
+        }
+        public override string ToString()
+        {
+            return string.Format("玩家{0}，血量{1},攻击力{2}，防御力{3},闪避{4}", name, hp, atk, def, dodge);
+        }
+    }
+    class Monster
+    {
+        //private int atk, def, hp, skill;//不用成员变量
+        public Monster(int atk, int def, int hp, int skill)
+        {
+            Atk = atk;
+            Def = def;
+            Hp = hp;
+            Skill = skill;
+        }
+        public int Atk//用属性
+        {
+            get;
+            set;
+        }
+        public int Def
+        {
+            get;
+            set;
+        }
+        public int Hp
+        {
+            get;
+            set;
+        }
+        public int Skill
+        {
+            get;
+            set;
+        }
+
+        public Monster Clone()
+        {
+            return MemberwiseClone() as Monster;
+        }
+        public override string ToString()
+        {
+            return string.Format("ATK{0},DEF{1},HP{2},SKILL{3}",Atk,Def,Hp,Skill);
+        }
+        
+    }
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+            Player p = new Player("张三",100,20,10,5);
+            Console.WriteLine(p);
+            Monster m = new Monster(90,50,100,1);
+            Monster m2 = m.Clone();
+            Console.WriteLine(m);
+            m2.Atk = 200;
+            m2.Skill = 20;
+            Console.WriteLine(m);
+            Console.WriteLine(m2);
+        }
+    }
+}