Stack cannot be resolved to a type - VsCode

Question

I'm trying to simply use a stack in java but, I get this error message

Code:

Error:

I tried to run "java clean" in the command palette to no effect. I use the java pack that Microsoft has recommended https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-pack . My JDK is the Development Kit 8 but I wouldn't think this to be the issue.

user_13939333 · Answer

To run VS Code for Java, Java SE 11 or above version is required. I'm using AdoptOpenJDK11 and the code works well:

Please install JDK11 or Rencent Version as JDK for language server.