添加Lesson3

C#进阶/Lesson3_Queue练习题/Lesson3_Queue练习题.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

C#进阶/Lesson3_Queue练习题/Program.cs

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+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());
+            }
+        }
+    }
+}