Eclipse: “The import java.io cannot be resolved”

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Check two things

Eclipse preferences

  1. Check your Eclipse preferences: Java -> Installed JREs
  2. The one that you’re using should be marked and it should be a JDK not just a JRE.

Project build path

  1. Also check your project’s build path: Right click on the project -> Properties -> Java Build Path
  2. Check in the libraries folder whether the JRE System Library is present and …
  3. If not add it using Add library -> JRE System Library and then
    select the correct one (from an installed JDK).

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