[fix] The declared package does not match the expected package

The declared package "" does not match the expected 
package "demo" Java(536871240)

Move this file to a named package.sonarlint(java:S1220)

You may get the above Compilation time error while working with Java on various IDEs (Eclipse, IntelliJ, VS Code, or Android Studio)

You are missing the package for this class, all you need to do is have the add for the package before import and you should be all good.