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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. import static java.util.stream.Collectors.counting;
  6. import static java.util.stream.Collectors.groupingBy;
  7.  
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		List<String> list = Arrays.asList("a", "a", "d", "c", "d", "c", "a", "d");
  13.  
  14. 		Map<String, Long> count = list.stream()
  15.             .collect(
  16.                 groupingBy(
  17.                     s -> s,
  18.                     () -> new HashMap<>(), // Map<String, Long>
  19.                     counting()
  20.                 )
  21.             );
  22.         System.out.println(count);
  23.  
  24.         count = list.stream()
  25.             .collect(
  26.                 groupingBy(
  27.                     s -> s,
  28.                     () -> new HashMap<String, Long>(),
  29.                     counting()
  30.                 )
  31.             );
  32.         System.out.println(count);
  33.  
  34.        /*count = list.stream()
  35.             .collect(
  36.                 groupingBy(
  37.                     s -> s,
  38.                     () -> new HashMap<String, long[]>(),
  39.                     counting()
  40.                 )
  41.             );
  42.         System.out.println(count);*/
  43. 	}
  44. }
Success #stdin #stdout 0.16s 2184192KB
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stdin
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Standard input is empty
stdout
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{a=3, c=2, d=3}
{a=3, c=2, d=3}
https://ideone.com/Zk3vez
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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