太棒了，我逐渐理解一切

test/SQLtest/.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

test/SQLtest/README.md

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+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).

test/SQLtest/src/Main.java

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+import java.sql.*;
+import java.util.Scanner;
+
+import javax.sql.*;
+import com.mysql.*;
+
+public class Main {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/game", "root", sc.next());
+            Statement statement = connection.createStatement();
+            ResultSet resultSet = statement.executeQuery("SELECT * FROM player;");
+            while (resultSet.next()) {
+                System.out.println("id:\t" + resultSet.getInt("id"));
+                System.out.println("name:\t" + resultSet.getString("name"));
+                System.out.println("sex:\t" + resultSet.getString("sex"));
+                System.out.println("email:\t" + resultSet.getString("email"));
+                System.out.println("level:\t" + resultSet.getInt("level"));
+                System.out.println("exp:\t" + resultSet.getInt("exp"));
+                System.out.println("gold:\t" + resultSet.getDouble("gold"));
+                System.out.println("------------------------------------------------");
+            }
+        } catch (SQLException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        } catch (ClassNotFoundException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+    }
+}