Warning:No JDK specified for module 'xxxxx' on idea

I wrote a java programme and type shift+alt+F10
 

 
a window showed up
 

 
But ,when I clicked run button ,no any works.
 

 
 
No JDK specified for module 'xxxxx',How to address this warning?
You already invited:

Nora

Upvotes from:

1. right click on your project,you would see
 

 
 

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