添加Lesson3

2025-10-11 11:21:51 +08:00
parent 921e096721
commit 6c30ef5c27
5 changed files with 143 additions and 0 deletions
@@ -13,6 +13,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson2_Stack", "Lesson2_St
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson2_Stack练习题", "Lesson2_Stack练习题\Lesson2_Stack练习题.csproj", "{BE917425-E4A8-4C51-89BE-8F6DD86A1C00}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson3_Queue", "Lesson3_Queue\Lesson3_Queue.csproj", "{E16850A5-9B2E-473D-B9FB-0694439290B9}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Lesson3_Queue练习题", "Lesson3_Queue练习题\Lesson3_Queue练习题.csproj", "{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -39,6 +43,14 @@ Global
 		{BE917425-E4A8-4C51-89BE-8F6DD86A1C00}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{BE917425-E4A8-4C51-89BE-8F6DD86A1C00}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{BE917425-E4A8-4C51-89BE-8F6DD86A1C00}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E16850A5-9B2E-473D-B9FB-0694439290B9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E16850A5-9B2E-473D-B9FB-0694439290B9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E16850A5-9B2E-473D-B9FB-0694439290B9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E16850A5-9B2E-473D-B9FB-0694439290B9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{77AE0EA5-FD54-46A0-A708-A2B38ABEE26D}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
@@ -0,0 +1,89 @@
+using System.Collections;
+
+namespace Lesson3_Queue
+{
+    class Test
+    {
+
+    }
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            #region 知识点一 队列本质
+            //queue是C#为我们封装好的类
+            //本质是一个Object数组，只是封装了特殊的存储规则
+
+            //queue是队列存储容器，队列是一种先进先出的数据结构
+            //先存入的数据先取出，后存入的数据后取出
+            #endregion
+
+            #region 知识点二 声明
+            //需要引用命名空间system.collections
+            Queue queue = new Queue();
+            #endregion
+
+            #region 知识点三 增取查改
+
+            //增
+            queue.Enqueue(1);//入队
+            queue.Enqueue("123");
+            queue.Enqueue(1.4f);
+            queue.Enqueue(new Test());
+
+            //取
+            object v = queue.Dequeue();//出队，取出队列头部的元素
+            Console.WriteLine(v);
+            v = queue.Dequeue();
+            Console.WriteLine(v);
+
+            //查
+            //1.查看队列头部的元素
+            v = queue.Peek();
+            Console.WriteLine(v);
+            v = queue.Peek();
+            Console.WriteLine(v);
+            //2.查看元素是否存在于队列中
+            if(queue.Contains(1.4f))
+            {
+                Console.WriteLine("存在1.4f");
+            }
+
+            //改
+            //队列没有提供修改元素的方法
+            //只能通过出队和入队的方式来间接修改元素
+            queue.Clear();
+            queue.Enqueue(1);
+            queue.Enqueue(2);
+            queue.Enqueue(3);
+            #endregion
+
+            #region 知识点四 遍历
+            //1.长度
+            Console.WriteLine(queue.Count);
+            //2.遍历
+            foreach (object item in queue)
+            {
+                Console.WriteLine(item);
+            }
+            //3.转数组
+            object[] arr = queue.ToArray();
+            for(int i = 0; i < arr.Length; i++)
+            {
+                Console.WriteLine(arr[i]);
+            }
+            //4.循环出队
+            while(queue.Count > 0)
+            {
+                Console.WriteLine(queue.Dequeue());
+            }
+            #endregion
+
+            #region 知识点五 
+            // 由于用万物之父来存储数据，自然存在装箱拆箱
+            // 当往其中进行值类型存储时就是在装箱
+            // 当将值类型对象取出来转换使用时，就存在拆箱
+            #endregion
+        }
+    }
+}
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
@@ -0,0 +1,22 @@
+using System.Collections;
+
+namespace Lesson3_Queue练习题
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Queue q = new Queue();
+            for(int i = 0; i < 10; i++)
+            {
+                Console.WriteLine("请输入消息:");
+                q.Enqueue(Console.ReadLine());
+            }
+            for(int i = 0; i < 10; i++)
+            {
+                Thread.Sleep(1000);
+                Console.WriteLine(q.Dequeue());
+            }
+        }
+    }
+}