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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.stream.* ;
  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. 		String s = "Downloaded";
  14.         Map<String, List<String>> map = Map.ofEntries(
  15.                 Map.entry( "Download", List.of( "Download", "Downloading", "Downloaded" ) ) ,
  16.                 Map.entry( "Upload", List.of( "Upload", "Uploading", "Uploaded" ) )
  17.         );
  18.         System.out.println( map ) ;
  19.  
  20.         Collection < String > keys =
  21.             map
  22.                 .entrySet()
  23.                 .stream()
  24.                 .filter( ( Map.Entry < String, List<String> > entry ) -> entry.getValue().contains( s ) )
  25.                 .map( Map.Entry :: getKey )
  26.                 .collect( Collectors.toUnmodifiableList() )  // Or replace with `.toList()` in more modern Java.
  27.         ;
  28.         System.out.println( keys ) ;
  29. 	}
  30. }
Success #stdin #stdout 0.09s 53976KB
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{Upload=[Upload, Uploading, Uploaded], Download=[Download, Downloading, Downloaded]}
[Download]
https://ideone.com/5Ig7aZ
language:
Java (HotSpot 12)
created:
265 days ago
visibility:
secret

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