Java 8 stream map to list of keys sorted by values

by

You say you want to sort by value, but you don’t have that in your code. Pass a lambda (or method reference) to sorted to tell it how you want to sort.

And you want to get the keys; use map to transform entries to keys.

List<Type> types = countByType.entrySet().stream()
        .sorted(Comparator.comparing(Map.Entry::getValue))
        .map(Map.Entry::getKey)
        .collect(Collectors.toList());

More Related Contents:

  1. How to force max to return ALL maximum values in a Java Stream?
  2. Java 8 Nested (Multi level) group by
  3. Retrieving a List from a java.util.stream.Stream in Java 8
  4. Java 8 Distinct by property
  5. Java 8 List into Map
  6. Why filter() after flatMap() is “not completely” lazy in Java streams?
  7. How can I throw CHECKED exceptions from inside Java 8 streams?
  8. Java 8 lambdas, Function.identity() or t->t
  9. Copy a stream to avoid “stream has already been operated upon or closed”
  10. Java 8: performance of Streams vs Collections
  11. Using Java 8’s Optional with Stream::flatMap
  12. Java 8 Streams: multiple filters vs. complex condition
  13. Lambda expression to convert array/List of String to array/List of Integers
  14. How do I keep the iteration order of a List when using Collections.toMap() on a stream?
  15. Java 8, Streams to find the duplicate elements
  16. How can I get a List from some class properties with Java 8 Stream?
  17. Why doesn’t java.util.Collection implement the new Stream interface?
  18. How to use a Java8 lambda to sort a stream in reverse order?
  19. Java 8 Collectors.toMap SortedMap
  20. Why does Stream.allMatch() return true for an empty stream?
  21. Java 8 grouping using custom collector?
  22. What Java 8 Stream.collect equivalents are available in the standard Kotlin library?
  23. How can I throw CHECKED exceptions from inside Java 8 lambdas/streams?
  24. How to apply multiple predicates to a java.util.Stream?
  25. Parallel stream from a HashSet doesn’t run in parallel
  26. Picking elements of a list until condition is met with Java 8 Lambdas
  27. Non-interference exact meaning in Java 8 streams
  28. In Java 8 how do I transform a Map to another Map using a lambda?
  29. Convert String array to Map using Java 8 Lambda expressions
  30. Group sequences of values

Leave a Comment