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  1. import java.util.ArrayList;
  2. import java.util.HashSet;
  3. import java.util.List;
  4. import java.util.Set;
  5. import java.util.stream.Collectors;
  6. import java.util.stream.Stream;
  7.  
  8. public class Main {
  9.     public static class Students {
  10.         int id;
  11.         String name;
  12.  
  13.         public Students(final int id, final String name) {
  14.             this.id = id;
  15.             this.name = name;
  16.         }
  17.  
  18.         public int getId() {
  19.             return this.id;
  20.         }
  21.  
  22.         public String getName() {
  23.             return this.name;
  24.         }
  25.     }
  26.  
  27.     public static void main(String[] args) {
  28.         List<Students> list1 = new ArrayList<>();
  29.         list1.add(new Students(1, "Josh"));
  30.         list1.add(new Students(2, "Jacob"));
  31.         list1.add(new Students(3, "Jane"));
  32.         List<Students> list2 = new ArrayList<>();
  33.         list2.add(new Students(1, "Josh"));
  34.         list2.add(new Students(4, "Jorge"));
  35.         final Set<Integer> ids = new HashSet<>();
  36.         final List<Students> unique = Stream.of(list1, list2).flatMap(List::stream).filter(s -> ids.add(s.getId()))
  37.                 .collect(Collectors.toList());
  38.         unique.forEach(s -> System.out.println(s.getId() + "-" + s.getName()));
  39.     }
  40. }
Success #stdin #stdout 0.12s 36868KB
comments (?)
stdin 
Standard input is empty
stdout 
1-Josh
2-Jacob
3-Jane
4-Jorge
https://ideone.com/D0rfLP
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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