IDEA 如何在复制粘贴时弹出Select Classes to Import

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### Intellij IDEA Project Multiple Src Directories Purpose and Configuration In an IntelliJ IDEA project, the `src` directory serves as the root folder where source files are stored. This includes Java classes, resources, configurations, and other assets required by the application[^1]. Typically, this structure helps organize code logically while adhering to conventions recognized by both developers and tools. Regarding whether multiple `src` directories can exist within one project: Yes, having several `src` folders is supported and often beneficial for organizing different types of sources or separating concerns such as main application logic from test cases. For instance, common practices include maintaining distinct paths like `src/main/java`, `src/test/java`, etc., each serving specific purposes related either to production code or testing environments. To configure additional source roots in an existing module inside IntelliJ IDEA: 1. Open **Project Structure** dialog via menu (`File | Settings...` on Windows/Linux; `IntelliJ IDEA | Preferences...` on macOS). 2. Select desired Module under Modules section. 3. Navigate to Sources tab. 4. Mark appropriate directories as Source Folders through contextual actions available after selecting target path(s). This setup allows IDE features (like indexing, navigation) to recognize these areas correctly without mixing up their contents unintentionally during development activities. ```java // Example showing how you might set up package structures across two separate 'src' locations package com.example.mainapp; public class MainApp { public static void main(String[] args){ System.out.println("Running from primary src location"); } } // Another possible placement could look similar but reside elsewhere physically package com.example.testcases; import org.junit.jupiter.api.Test; class TestCases{ @Test void sampleTest(){ // Testing functionality... } } ``` --related questions-- 1. How does adding more than one source directory impact dependency management? 2. What best practices should be followed when structuring large projects with numerous modules? 3. Can custom naming conventions apply to extra source directories beyond standard ones provided by frameworks? 4. Is there any performance implication associated with configuring multiple source roots?
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