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  1. import java.util.Arrays;
  2. import java.util.Collections;
  3. import java.util.List;
  4. import java.util.stream.Collectors;
  5.  
  6. public final class Main {
  7.  
  8.     public static final class Node {
  9.  
  10.         private final String name;
  11.         private final List<Node> children;
  12.  
  13.         public Node(String name) {
  14.             this(name, Collections.emptyList());
  15.         }
  16.  
  17.         public Node(String name, String... children) {
  18.             this(name, Arrays.stream(children)
  19.                 .map(Node::new)
  20.                 .collect(Collectors.toUnmodifiableList()));
  21.         }
  22.  
  23.         private Node(String name, List<Node> list) {
  24.             this.name = name;
  25.             this.children = list;
  26.         }
  27.  
  28.         public List<Node> getChildNodes() {
  29.             return children;
  30.         }
  31.  
  32.         @Override
  33.         public String toString() {
  34.             return "name: " + name;
  35.         }
  36.     }
  37.  
  38.     private static List<Node> getNodes() {
  39.         return List.of(
  40.             new Node("image", "raw", "jpeg", "png"),
  41.             new Node("video", "mp4"),
  42.             new Node("game"),
  43.             new Node("music", "wav", "mp3"));
  44.     }
  45.  
  46.     private static void fixMe() {
  47.         var list = getNodes().stream()
  48. 	        .flatMap(n -> n.getChildNodes().stream().findFirst().stream())
  49.             .collect(Collectors.toList());
  50.         list.forEach(System.out::println);
  51.     }
  52.  
  53.     public static void main(String[] args) {
  54.         fixMe();
  55.     }
  56. }
  57.  
Success #stdin #stdout 0.13s 36528KB
comments (?)
stdin 
Standard input is empty
stdout 
name: raw
name: mp4
name: wav
https://ideone.com/gmxGnY
The Insanity Beyond Null: Exercise 1 (Java) [sample fix]
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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