NetBeans 8.2报错‘找不到符号’但编译正常，求解决方案

Hey there! Let's fix that annoying auto-completion issue with your same-package Settings class—even though your code compiles and runs perfectly, losing that handy auto-completion makes coding way less efficient, right?

Since your code works fine, this is almost certainly an IDE cache/index glitch or a small configuration misstep. Try these steps one by one:

• Clear and Rebuild IDE Caches
  This is the most common fix for weird IDE recognition issues:

  • For IntelliJ IDEA/Android Studio: Go to File → Invalidate Caches..., check Invalidate and Restart, and wait for the IDE to reboot and rebuild its index.
  • For Eclipse: Click Project → Clean..., select your project, then right-click the project → Refresh, and re-build the project.

• Double-Check Package Structure & Class Visibility
  Even though you said the code is okay, a quick sanity check won't hurt:

  • Make sure your Settings class uses the default package-level access (no public/private modifier)—this lets same-package classes access it, and sometimes IDEs misflag this if the package structure isn't recognized.
  • Confirm the folder containing Settings is marked as a Sources Root (blue folder in IDEA, Source Folder in Eclipse). If it's not, IDE won't index the class properly.

• Re-Import the Project
  If caches didn't help, try removing the project from your IDE and re-importing it. Sometimes project config files (like .iml or .project) get corrupted, and a fresh import resets these settings.

• Sync Build Tool Configurations
  If you're using Maven/Gradle:

  • Run clean and compile commands in your build tool to regenerate build files.
  • Go back to your IDE and sync the project with the build tool's configuration (e.g., "Sync Project with Gradle Files" in Android Studio).

These steps should get your auto-completion working again—since the code runs correctly, the issue is definitely on the IDE's side, not your code!

内容的提问来源于stack exchange，提问作者Xiutux