From 114536061f4f985b7ad3e26e3a2d929e9bc2eded Mon Sep 17 00:00:00 2001 From: Kister Hakusan <2753888203@qq.com> Date: Fri, 10 Oct 2025 09:39:57 +0800 Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0Lesson1=EF=BC=8CArrayList?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- C#进阶/C#进阶.sln | 14 ++- .../Lesson1_ArrayList/Lesson1_ArrayList.csproj | 10 +++ C#进阶/Lesson1_ArrayList/Program.cs | 86 +++++++++++++++++++ .../Lesson1_ArrayList练习题.csproj | 10 +++ C#进阶/Lesson1_ArrayList练习题/Program.cs | 85 ++++++++++++++++++ C#进阶/test/Program.cs | 23 +++++ 6 files changed, 227 insertions(+), 1 deletion(-) create mode 100644 C#进阶/Lesson1_ArrayList/Lesson1_ArrayList.csproj create mode 100644 C#进阶/Lesson1_ArrayList/Program.cs create mode 100644 C#进阶/Lesson1_ArrayList练习题/Lesson1_ArrayList练习题.csproj create mode 100644 C#进阶/Lesson1_ArrayList练习题/Program.cs diff --git a/C#进阶/C#进阶.sln b/C#进阶/C#进阶.sln index d62587b..87dd804 100644 --- a/C#进阶/C#进阶.sln +++ b/C#进阶/C#进阶.sln @@ -1,10 +1,14 @@  Microsoft Visual Studio Solution File, Format Version 12.00 # Visual Studio Version 17 -VisualStudioVersion = 17.14.36202.13 d17.14 +VisualStudioVersion = 17.14.36202.13 MinimumVisualStudioVersion = 10.0.40219.1 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "test", "test\test.csproj", "{5B032C55-6E02-4EA9-BE52-083A6DA91295}" EndProject +Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson1_ArrayList", "Lesson1_ArrayList\Lesson1_ArrayList.csproj", "{A3FB97E5-BFB8-41F5-AA91-79C16EC75513}" +EndProject +Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson1_ArrayList练习题", "Lesson1_ArrayList练习题\Lesson1_ArrayList练习题.csproj", "{B9F9E174-21EA-40E7-A139-58FFD3448023}" +EndProject Global GlobalSection(SolutionConfigurationPlatforms) = preSolution Debug|Any CPU = Debug|Any CPU @@ -15,6 +19,14 @@ Global {5B032C55-6E02-4EA9-BE52-083A6DA91295}.Debug|Any CPU.Build.0 = Debug|Any CPU {5B032C55-6E02-4EA9-BE52-083A6DA91295}.Release|Any CPU.ActiveCfg = Release|Any CPU {5B032C55-6E02-4EA9-BE52-083A6DA91295}.Release|Any CPU.Build.0 = Release|Any CPU + {A3FB97E5-BFB8-41F5-AA91-79C16EC75513}.Debug|Any CPU.ActiveCfg = Debug|Any CPU + {A3FB97E5-BFB8-41F5-AA91-79C16EC75513}.Debug|Any CPU.Build.0 = Debug|Any CPU + {A3FB97E5-BFB8-41F5-AA91-79C16EC75513}.Release|Any CPU.ActiveCfg = Release|Any CPU + {A3FB97E5-BFB8-41F5-AA91-79C16EC75513}.Release|Any CPU.Build.0 = Release|Any CPU + {B9F9E174-21EA-40E7-A139-58FFD3448023}.Debug|Any CPU.ActiveCfg = Debug|Any CPU + {B9F9E174-21EA-40E7-A139-58FFD3448023}.Debug|Any CPU.Build.0 = Debug|Any CPU + {B9F9E174-21EA-40E7-A139-58FFD3448023}.Release|Any CPU.ActiveCfg = Release|Any CPU + {B9F9E174-21EA-40E7-A139-58FFD3448023}.Release|Any CPU.Build.0 = Release|Any CPU EndGlobalSection GlobalSection(SolutionProperties) = preSolution HideSolutionNode = FALSE diff --git a/C#进阶/Lesson1_ArrayList/Lesson1_ArrayList.csproj b/C#进阶/Lesson1_ArrayList/Lesson1_ArrayList.csproj new file mode 100644 index 0000000..2150e37 --- /dev/null +++ b/C#进阶/Lesson1_ArrayList/Lesson1_ArrayList.csproj @@ -0,0 +1,10 @@ + + + + Exe + net8.0 + enable + enable + + + diff --git a/C#进阶/Lesson1_ArrayList/Program.cs b/C#进阶/Lesson1_ArrayList/Program.cs new file mode 100644 index 0000000..a0c2b4b --- /dev/null +++ b/C#进阶/Lesson1_ArrayList/Program.cs @@ -0,0 +1,86 @@ +using System.Collections; + +namespace Lesson1_ArrayList +{ + internal class Program + { + static void Main(string[] args) + { + #region 练习题回归 + //C#核心中 索引器的练习题 + //自定义一个整形数组类，该类中有一个整形数组变量 + //为他封装增删查改的方法 + #endregion + + #region 知识点一 ArrayList的本质 + //ArrayList是c#为我们封装好的类 + //本质是一个Object类型的数组 + //ArrayList可以帮我们实现增删改查等功能 + #endregion + + #region 知识点二 声明 + //注意：使用ArrayList需要引入命名空间 using System.Collections; + ArrayList arrayList = new ArrayList(); + #endregion + ///可以用F12进ArrayList中查看方法或去微软官方文档查看 + + + #region 知识点三 增删改查 + //增 + arrayList.Add(1.2f); + arrayList.Add("123"); + arrayList.Add(new Object()); + arrayList.Add(true); + //插入 + arrayList.Insert(0, "插入的元素");//在指定索引位置插入元素，原来该位置及其后面的元素依次后移 + + arrayList.AddRange(new int[] { 1, 2, 3, 4, 5 });//一次性添加多个元素 + //删 + arrayList.Remove("123");//移除指定元素，如果有多个相同元素，只移除第一个 + arrayList.RemoveAt(0);//移除指定索引位置的元素 + arrayList.RemoveRange(0, 2);//移除从指定索引位置开始的指定个数的元素 + arrayList.Clear();//清空所有元素 + //改 + arrayList[1] = 4; + //查 + Console.WriteLine(arrayList[0]); + if (arrayList.Contains("123")) + { + //如果包含指定元素执行的代码 + } + //正向查找指定的元素，返回索引位置，如果没有找到返回-1 + int index = arrayList.IndexOf(3); + Console.WriteLine(index); + //反向查找指定的元素，返回索引位置，如果没有找到返回-1 + int lastIndex = arrayList.LastIndexOf(3); + Console.WriteLine(lastIndex); + #region 遍历 + Console.WriteLine(arrayList.Count);//获取元素个数(长度) + Console.WriteLine(arrayList.Capacity);//获取ArrayList的容量(用于以后避免产生过多垃圾) + for (int i = 0; i < arrayList.Count; i++) + { + Console.WriteLine(arrayList[i]); + } + //迭代器遍历 + foreach (var item in arrayList)//有个var类型临时变量item来接每次遍历到的元素 + { + Console.WriteLine(item); + } + #endregion + + #endregion + + #region 知识点四 装箱拆箱 + //ArrayList存储的是Object类型的元素 + //所以Object类型的数组存储的是值类型时会发生装箱拆箱 + //装箱：值类型转换为引用类型的过程 + //拆箱：引用类型转换为值类型的过程 + //所以ArrayList存储值类型时会影响性能尽量少用 + int i = 1; + arrayList.Add(i);//发生装箱 + int j = (int)arrayList[0];//发生拆箱 + #endregion + + } + } +} diff --git a/C#进阶/Lesson1_ArrayList练习题/Lesson1_ArrayList练习题.csproj b/C#进阶/Lesson1_ArrayList练习题/Lesson1_ArrayList练习题.csproj new file mode 100644 index 0000000..2150e37 --- /dev/null +++ b/C#进阶/Lesson1_ArrayList练习题/Lesson1_ArrayList练习题.csproj @@ -0,0 +1,10 @@ + + + + Exe + net8.0 + enable + enable + + + diff --git a/C#进阶/Lesson1_ArrayList练习题/Program.cs b/C#进阶/Lesson1_ArrayList练习题/Program.cs new file mode 100644 index 0000000..0fb59ae --- /dev/null +++ b/C#进阶/Lesson1_ArrayList练习题/Program.cs @@ -0,0 +1,85 @@ +using System.Collections; + +namespace Lesson1_ArrayList练习题 +{ + class Backpack + { + ArrayList stuff; + int money; + public Backpack() + { + money = 0; + stuff = new ArrayList(); + } + public Backpack(int money) + { + stuff = new ArrayList(); + this.money = money; + } + public void ShowBackPack() + { + Console.WriteLine("背包物品有："); + for (int i = 0; i < stuff.Count; i++) + { + if (i + 1 != stuff.Count) + { + Console.Write(stuff[i] + "、"); + } + else + { + Console.WriteLine(stuff[i]); + } + } + } + public void BuyStuff(Object obj,int cost) + { + if(cost > money) + { + Console.WriteLine("余额不足"); + } + else + { + stuff.Add(obj); + money -= cost; + Console.WriteLine("成功购买物品：" + obj); + } + } + public void SoldStuff(object obj,int earned) + { + if (stuff.Contains(obj)) + { + stuff.Remove(obj); + money += earned; + Console.WriteLine("成功出售物品：" + obj); + } + else + { + Console.WriteLine("没有该物品，无法出售：" + obj); + } + } + public void ShowMoney() + { + Console.WriteLine("当前余额：" + money); + } + } + class Program + { + static void Main(string[] args) + { + Backpack b1= new Backpack(); + Backpack b2 = new Backpack(100); + b1.ShowBackPack(); + b2.ShowBackPack(); + b1.BuyStuff("sth1", 50); + b2.BuyStuff("sth2", 50); + b1.ShowBackPack(); + b2.ShowBackPack(); + b1.SoldStuff("sth1", 25); + b2.SoldStuff("sth2", 25); + b1.ShowBackPack(); + b2.ShowBackPack(); + b1.ShowMoney(); + b2.ShowMoney(); + } + } +} diff --git a/C#进阶/test/Program.cs b/C#进阶/test/Program.cs index 7d65486..d5abc3b 100644 --- a/C#进阶/test/Program.cs +++ b/C#进阶/test/Program.cs @@ -6,5 +6,28 @@ { Console.WriteLine("Hello, World!"); } + #region 知识点一 + #endregion + + #region 知识点二 + #endregion + + #region 知识点三 + #endregion + + #region 知识点四 + #endregion + + #region 知识点五 + #endregion + + #region 知识点六 + #endregion + + #region 知识点七 + #endregion + + #region 知识点八 + #endregion } }