添加Lesson14和Lesson15
This commit is contained in:
@@ -19,6 +19,14 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson12_继承-继承的
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson13_继承-里氏替换原则练习", "Lesson13_继承-里氏替换原则练习\Lesson13_继承-里氏替换原则练习.csproj", "{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson14_继承-继承中的构造函数", "Lesson14_继承-继承中的构造函数\Lesson14_继承-继承中的构造函数.csproj", "{DD06D61F-A96A-423A-ADB7-C74D555575AD}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson14_继承-继承中的构造函数练习", "Lesson14_继承-继承中的构造函数练习\Lesson14_继承-继承中的构造函数练习.csproj", "{01D03E15-704A-45B9-8854-2AFBED1BC69F}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson15_继承-万物之父和装箱拆箱", "Lesson15_继承-万物之父和装箱拆箱\Lesson15_继承-万物之父和装箱拆箱.csproj", "{E9C8E0F1-E80C-48B8-A049-A3D9719915E1}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson15_继承-万物之父和装箱拆箱练习", "Lesson15_继承-万物之父和装箱拆箱练习\Lesson15_继承-万物之父和装箱拆箱练习.csproj", "{FD313E4D-09E3-4310-B001-8BD9BF0B7C45}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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@@ -57,6 +65,22 @@ Global
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{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{B17DEE02-D1AD-460B-8295-DDDE32A0EDA7}.Release|Any CPU.Build.0 = Release|Any CPU
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{DD06D61F-A96A-423A-ADB7-C74D555575AD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{DD06D61F-A96A-423A-ADB7-C74D555575AD}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{DD06D61F-A96A-423A-ADB7-C74D555575AD}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{DD06D61F-A96A-423A-ADB7-C74D555575AD}.Release|Any CPU.Build.0 = Release|Any CPU
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{01D03E15-704A-45B9-8854-2AFBED1BC69F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{01D03E15-704A-45B9-8854-2AFBED1BC69F}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{01D03E15-704A-45B9-8854-2AFBED1BC69F}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{01D03E15-704A-45B9-8854-2AFBED1BC69F}.Release|Any CPU.Build.0 = Release|Any CPU
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{E9C8E0F1-E80C-48B8-A049-A3D9719915E1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{E9C8E0F1-E80C-48B8-A049-A3D9719915E1}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{E9C8E0F1-E80C-48B8-A049-A3D9719915E1}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{E9C8E0F1-E80C-48B8-A049-A3D9719915E1}.Release|Any CPU.Build.0 = Release|Any CPU
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{FD313E4D-09E3-4310-B001-8BD9BF0B7C45}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{FD313E4D-09E3-4310-B001-8BD9BF0B7C45}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{FD313E4D-09E3-4310-B001-8BD9BF0B7C45}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{FD313E4D-09E3-4310-B001-8BD9BF0B7C45}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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@@ -0,0 +1,11 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<RootNamespace>Lesson14_继承_继承中的构造函数</RootNamespace>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>
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@@ -0,0 +1,131 @@
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namespace Lesson14_继承_继承中的构造函数
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{
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#region 知识回顾
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//构造函数
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//实例化对象时调用的函数
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//主要用来初始化成员变量
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//每个类都会有一个默认的无参构造函数
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//语法
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//访问修饰符 类名()
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//{
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// 初始化语句
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//}
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//不写返回值
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//函数名和类名相同
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//访问修饰符根据需求决定,一般为public
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//构造函数可以重载
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//可以用this语法重用代码
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//注意
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//有参构造会顶掉无参构造
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//需要重新声明无参构造
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class Test
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{
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public int testI;
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public string testStr;
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public Test()
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{
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}
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public Test(int i)
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{
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this.testI = i;
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}
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public Test(int i, string str) : this(i)//复用上方public Test(int i)
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{
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this.testStr = str;
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}
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}
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#endregion
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#region 知识点一 基本概念
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//特点
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//当声明一个子类对象时
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//先执行父类的构造函数
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//再执行子类的构造函数
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//注意:
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//1.父类的无参构造 很重要
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//2.子类可以通过base关键字 代表父类 调用父类构造
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#endregion
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#region 知识点二 继承中构造函数的执行顺序
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//父类的父类的构造->...父类构造->...->子类构造
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class GameObject
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{
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public GameObject() {
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Console.WriteLine("gameobject的构造函数");
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}
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}
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class Player : GameObject
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{
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public Player()
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{
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Console.WriteLine("player的构造函数");
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}
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}
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class MainPlayer : Player
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{
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public MainPlayer()
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{
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Console.WriteLine("mainplayer的构造函数");
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}
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}
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#endregion
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#region 知识点三 父类的无参构造函数很重要
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//子类实例化时默认调用的父类无参构造,如果父类无参被顶掉会报错
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//class Father
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//{
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// public Father(int i)//用有参把无参构造顶了
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// {
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// Console.WriteLine("father的构造");
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// }
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//}
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//class Son: Father//无参构造函数被顶导致无法正确调用父类构造函数
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//{
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// public Son()
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// {
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// Console.WriteLine("son");
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// }
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//}
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#endregion
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#region 知识点四 通过base调用指定父类构造
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class Father
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{
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public Father(int i)//用有参把无参构造顶了
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{
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Console.WriteLine("father的构造,参数i的值{0}",i);
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}
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}
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class Son : Father
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{
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public Son(int i):base(i)//用base来传给父类构造函数一个值
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{
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Console.WriteLine("son 1,参数i的值{0}", i);
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}
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public Son(int i, int j) : this(i)//用this来调用上一个public Son(int i):base(i)继而用base来传给父类构造函数一个值
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{
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Console.WriteLine("son 2,参数i的值{0}", i);
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}
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}
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#endregion
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internal class Program
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{
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static void Main(string[] args)
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{
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Console.WriteLine("Hello, World!");
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MainPlayer mp = new MainPlayer();
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Console.WriteLine();
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Console.WriteLine();
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Son s = new Son(1,2);
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}
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}
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}
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@@ -0,0 +1,11 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<RootNamespace>Lesson14_继承_继承中的构造函数练习</RootNamespace>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>
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@@ -0,0 +1,63 @@
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namespace Lesson14_继承_继承中的构造函数练习
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{
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class Worker
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{
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public string job;
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public string content;
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public Worker(string job, string content)
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{
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this.job = job;
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this.content = content;
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}
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public void Work()
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{
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Console.WriteLine("{0}做了{1}",job,content);
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}
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}
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class Programer : Worker
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{
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public Programer() : base("程序员", "编程")
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{
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Console.WriteLine("调用了Programer无参构造");
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}
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}
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class Plan : Worker
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{
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public Plan() : base("策划", "设计游戏")
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{
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Console.WriteLine("调用了Plan无参");
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}
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}
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class Art : Worker
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{
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public Art() : base("美术", "美术设计")
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{
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Console.WriteLine("调用了Art的无参构造");
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}
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public void testArt()
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{
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Console.WriteLine("调用了testArt测试函数");
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}
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}
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internal class Program
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{
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static void Main(string[] args)
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{
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Console.WriteLine("Hello, World!");
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Programer programer = new Programer();
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programer.Work();
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Worker art = new Art();
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art.Work();
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Console.WriteLine(art is Programer);
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Console.WriteLine(art is Art);
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Console.WriteLine(art is Worker);
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Art test = art as Art;
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test.testArt();
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}
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}
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}
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@@ -0,0 +1,11 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<RootNamespace>Lesson15_继承_万物之父和装箱拆箱</RootNamespace>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>
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@@ -0,0 +1,97 @@
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namespace Lesson15_继承_万物之父和装箱拆箱
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{
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#region 里氏替换原则知识点回顾
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//概念:父类容器装子类对象
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//作用:方便进行对象存储和管理
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//使用
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//is和as
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//is用于判断
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//as用于转换
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class Father
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{
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}
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class Son : Father
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{
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public void Speak()
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{
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Console.WriteLine("Son.Speak()");
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}
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}
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#endregion
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#region 知识点一 万物之父
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//万物之父
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//关键字Object
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//概念
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//object时所有类型的积累,他是一个类(引用类型)
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//作用:
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//1.可以利用里氏替换原则,用object容器装所有对象
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//2.可以用来表示不确定类型,作为函数参数类型
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#endregion
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internal class Program
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{
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static void Main(string[] args)
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{
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Console.WriteLine("Hello, World!");
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#region 知识点二 万物之父的使用
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Father f = new Son();
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if (f is Son)
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{
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(f as Son).Speak();
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}
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//引用类型
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object o = new Son();
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o = f;
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//用is和as来判断和转换即可
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if(o is Son)
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{
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(o as Son).Speak();
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}
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//值类型
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object o2 = 1f;
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//用强转
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float fl = (float)o2;
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Console.WriteLine(o2);
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//特殊的string类型
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object str = "123";
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string str2 = str.ToString();
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string str3 = str as string;
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Console.WriteLine(str2+str3);
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//数组
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object arr = new int[10];
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int[] ar = arr as int[];
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#endregion
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#region 知识点三 装箱拆箱
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//发生条件
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//用objcet存值类型(装值)
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//再把object转为值类型(拆箱)
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//装箱
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//把值类型用引用类型存储
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//栈内存会迁移到堆内存中
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//拆箱
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//把引用类型存储的值类型取出来
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//堆内存会迁移到栈内存中
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//好处:不确定类型时可以方便参数的存储和传递
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//坏处:存在内存迁移,增加性能消耗
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#endregion
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Test2(1, 2, 3, 4);
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}
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#region 知识点四 无敌知识点
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//在使用变长传值时,如果不知道会传什么进去的时候就可以用object来存储
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static void Test(params int[] array) { }//这个方法只能获取int类型
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static void Test2(params object[] array) { }//这样就可以存任意长度任意类型的参数进来了
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#endregion
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}
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}
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@@ -0,0 +1,11 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<RootNamespace>Lesson15_继承_万物之父和装箱拆箱练习</RootNamespace>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>
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@@ -0,0 +1,19 @@
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namespace Lesson15_继承_万物之父和装箱拆箱练习
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{
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internal class Program
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{
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static void Main(string[] args)
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{
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Console.WriteLine("Hello, World!");
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//用代码演示拆箱装箱
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//装箱
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int i = 10;
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object o1 = i;
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//拆箱
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object o2 = o1;
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int i2 = (int)o2;
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}
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}
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}
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