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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.         List<Map<String,List<String>>> list=new ArrayList<>();
  14.         Map<String,List<String>> map1=new HashMap<>();
  15.         map1.put("1", Arrays.asList(new String[] {"A"}));
  16.         map1.put("2", Arrays.asList(new String[] {"B"}));
  17.  
  18.         Map<String,List<String>> map2=new HashMap<>();
  19.         map2.put("1", Arrays.asList(new String[] {"C"}));
  20.         map2.put("2", Arrays.asList(new String[] {"D"}));
  21.         list.add(map1);
  22.         list.add(map2);
  23.  
  24.         Map<String, List<String>> result = new HashMap<>();
  25.         result.put("1", list.stream()
  26.             .filter(e -> e.containsKey("1"))
  27.             .flatMap(e -> e.values().stream())
  28.             .flatMap(List::stream)
  29.             .collect(Collectors.toList()));
  30.         Map<String, List<String>> result2 = list.stream()
  31.             .filter(e -> e.containsKey("1"))
  32.             .flatMap(e -> e.values().stream())
  33.             .flatMap(List::stream)
  34.             .collect(Collectors.groupingBy(t -> "1"));
  35.  
  36.         System.out.println(result.equals(result2));
  37.     }
  38.  
  39. }
Success #stdin #stdout 0.13s 34520KB
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https://ideone.com/WFYcvI
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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