如何让IntelliJ自动显示提示建议？Java 12异常提示失效解决方案

Got it, let's break down how to fix both of your IntelliJ issues step by step:

To get IntelliJ to show code suggestions automatically without having to press Ctrl+Space (Windows/Linux) or Cmd+Space (Mac), follow these steps:

• Open the Settings panel: For Windows/Linux, go to File > Settings; for Mac, go to IntelliJ IDEA > Settings
• Navigate to Editor > General > Code Completion
• In the Autopopup in field, set the delay to 0 milliseconds—this makes suggestions pop up instantly as you type
• Make sure the Show suggestions as you type checkbox is ticked
• For extra context, you can also enable other auto-popup options like Autopopup for method parameters if you want parameter hints to appear automatically too

Hit Apply > OK when done, and you'll start seeing suggestions pop up automatically as you write code.

It's frustrating when the exception-handling suggestions (adding exceptions to method signatures or wrapping code in try/catch) work in Java 8 but break in Java 12. Here's how to fix that:

• Ensure your IntelliJ version supports Java 12: Java 12 launched in March 2019, so you'll need IntelliJ IDEA 2019.1 or newer. If you're on an older version, upgrading to the latest stable release will help with compatibility.
• Turn on the Unhandled Exception inspection:
  1. Open Settings and go to Editor > Inspections > Java > Probable bugs > Unhandled exception
  2. Check the box to enable this inspection
  3. On the right side, make sure both Suggest adding exception to method signature and Suggest wrapping in try/catch are selected—these are the options that trigger the hints you're missing
• Verify project SDK and language level:
  1. Open File > Project Structure (or use the shortcut Ctrl+Alt+Shift+S)
  2. In the Project tab, confirm Project SDK is set to Java 12, and Project language level is set to 12 - Preview features enabled (or the official Java 12 level)
  3. Switch to the Modules tab and ensure each module's Language level is also set to Java 12—mismatched levels can cause inspection issues
• Clear IntelliJ's cache:
  Corrupted cache can sometimes break IDE features. Go to File > Invalidate Caches..., select Invalidate and Restart, and let the IDE reload. This often fixes odd behavior like missing hints.

After going through these steps, you should see the same exception-handling suggestions in Java 12 that you did in Java 8.

内容的提问来源于stack exchange，提问作者RamPrakash