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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.stream.Collectors;
  5. import java.util.function.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		String input = "tacocat backwards is tacocat";
  13. 		String[] words = input.split( " " );
  14. 		Map < String, Long > wordCount =
  15. 		        Arrays
  16. 		                .stream( words )
  17. 		                .collect(
  18. 		                        Collectors.groupingBy(
  19. 		                                Function.identity() ,
  20. 		                                Collectors.counting()
  21. 		                        )
  22. 		                );
  23. 		System.out.println( wordCount );
  24.  
  25. 		Map < String, Long > dupCount =
  26. 		        wordCount
  27. 		                .entrySet()
  28. 		                .stream()
  29. 		                .filter(
  30. 		                        entry -> entry.getValue() > 1
  31. 		                )
  32. 		                .collect(
  33. 		                        Collectors.toMap(
  34. 		                                entry -> entry.getKey() ,
  35. 		                                entry -> entry.getValue()
  36. 		                        )
  37. 		                );
  38. 		System.out.println( dupCount );
  39. 	}
  40. }
Success #stdin #stdout 0.11s 50304KB
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stdin
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Standard input is empty
stdout
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{tacocat=2, is=1, backwards=1}
{tacocat=2}
https://ideone.com/3ugPTf
language:
Java (12.0.1)
created:
3 years ago
visibility:
public

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