Nested lists with streams in Java8

by

You can use two flatMap then a filter then you can pick the first one or if no result return null :

C c1 = listOfAObjects.stream()
        .flatMap(a -> a.getList().stream())
        .flatMap(b -> b.getPr().stream())
        .filter(c -> c.getName().equalsIgnoreCase(name))
        .findFirst()
        .orElse(null);

More Related Contents:

  1. Java 8 stream reverse order
  2. Why didn’t Stream have a toList() method?
  3. Get last element of Stream/List in a one-liner
  4. Get List<K> from HashMap<K, V> where V is instance of I [closed]
  5. Java 8 Distinct by property
  6. In Java streams is peek really only for debugging?
  7. Why filter() after flatMap() is “not completely” lazy in Java streams?
  8. Copy a stream to avoid “stream has already been operated upon or closed”
  9. What is difference between Collection.stream().forEach() and Collection.forEach()?
  10. Find first element by predicate
  11. Why is a combiner needed for reduce method that converts type in java 8
  12. Filter Java Stream to 1 and only 1 element
  13. How can I make Cartesian product with Java 8 streams?
  14. Find maximum, minimum, sum and average of a list in Java 8
  15. Java 8 method references: provide a Supplier capable of supplying a parameterized result
  16. Java streams lazy vs fusion vs short-circuiting
  17. Java Streams – How to group by value and find min and max value of each group?
  18. Java 8 Stream, getting head and tail
  19. Recursive use of Stream.flatMap()
  20. Stream stateful computation: cumulative sums
  21. Java 8 grouping using custom collector?
  22. In Java, how do I efficiently and elegantly stream a tree node’s descendants?
  23. Java8: HashMap to HashMap using Stream / Map-Reduce / Collector
  24. Is mapToDouble() really necessary for summing a List with Java 8 streams?
  25. Why is Files.list() parallel stream performing so much slower than using Collection.parallelStream()?
  26. Is it possible to cast a Stream in Java 8?
  27. Merging two Map with Java 8 Stream API
  28. How to compare two Streams in Java 8
  29. ‘Optional.get()’ without ‘isPresent()’ check
  30. Most elegant way to join a Map to a String in Java 8

Leave a Comment