- JDK 11
- Update IntelliJ
- Open the project into Intellij as follows:
- Click
Open
. - Select the project directory, and click
OK
. - If there are any further prompts, accept the defaults.
- Click
- Configure the project to use JDK 11 (not other versions) as explained in here.
In the same dialog, set the Project language level field to theSDK default
option. - After that, locate the
src/main/java/Duke.java
file, right-click it, and chooseRun Duke.main()
(if the code editor is showing compile errors, try restarting the IDE). If the setup is correct, you should see something like the below as the output: