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  1. import java.util.List;
  2. import java.util.Map;
  3. import java.util.stream.Collectors;
  4. import java.util.stream.Stream;
  5.  
  6. class Ideone {
  7.   public static void main(String[] args) {
  8.     final List<Item> items = List.of(
  9.         new Item("foo1", "foo1", "foo"),
  10.         new Item("foo1", "foo2", "foo"),
  11.         new Item("bar1", "bar1", "bar")
  12.     );
  13.     final Map<String, List<Item>> itemsByTeam =
  14.         items.stream().collect(Collectors.groupingBy(item -> item.team));
  15.     System.out.println(itemsByTeam);
  16.   }
  17. }
  18.  
  19. class Item {
  20.   public String id;
  21.   public String name;
  22.   public String team;
  23.  
  24.   public Item(String id, String name, String team) {
  25.     this.id = id;
  26.     this.name = name;
  27.     this.team = team;
  28.   }
  29.  
  30.   @Override
  31.   public String toString() {
  32.     return "Item{" +
  33.         "id='" + id + '\'' +
  34.         ", name='" + name + '\'' +
  35.         ", team='" + team + '\'' +
  36.         '}';
  37.   }
  38. }
Success #stdin #stdout 0.17s 56840KB
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stdin
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Standard input is empty
stdout
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{bar=[Item{id='bar1', name='bar1', team='bar'}], foo=[Item{id='foo1', name='foo1', team='foo'}, Item{id='foo1', name='foo2', team='foo'}]}
https://ideone.com/Ch642S
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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