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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		var actions = new ArrayList<Runnable>();
  10.  
  11. 		for(var i = 0; i<3; i++)
  12. 		{
  13. 		    actions.add(() -> System.out.println(i));
  14. 		}
  15.  
  16. 		for (var action : actions)
  17. 		{
  18. 		    action.run();
  19. 		}		
  20.  
  21. 	}
  22. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:13: error: local variables referenced from a lambda expression must be final or effectively final
		    actions.add(() -> System.out.println(i));
		                                         ^
1 error
stdout
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Standard output is empty
https://ideone.com/Tz5Ad1
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

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