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)
Fix:
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.
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