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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.stream.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. 	public static void main (String[] args) throws java.lang.Exception
  12. 	{
  13. 		Repo fooRepository = new Repo();
  14.  
  15. 		Map<Bar, Set<Baz>> m = fooRepository.findAll()
  16. 		        .stream()
  17. 		        .collect(Collectors.groupingBy(Foo::getBar,
  18. 		                Collectors.mapping(Foo::getBaz, Collectors.toSet())));
  19.  
  20. 		System.out.println("success");
  21. 	}
  22.  
  23. 	interface Bar {}
  24. 	interface Baz {}
  25. 	interface Foo {
  26. 		Bar getBar();
  27. 		Baz getBaz();
  28. 	}
  29. 	static class Repo {
  30. 		List<Foo> findAll() {
  31. 			return Collections.emptyList();
  32. 		}
  33. 	}
  34. }
Success #stdin #stdout 0.14s 4386816KB
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success
https://ideone.com/BgO2pQ
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
secret

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