How to fix ambiguous type on method reference (toString of an Integer)?

by

There is no way to make method references unambiguous; simply said, method references are a feature that is just supported for unambiguous method references only. So you have two solutions:

  1. use a lambda expression:

    Stream.of(1, 32, 12, 15, 23).map(i->Integer.toString(i));

  2. (preferred, at least by me) Use a stream of primitive int values when the source consists of primitive int values only:

    IntStream.of(1, 32, 12, 15, 23).mapToObj(Integer::toString);

    This will use the static Integer.toString(int) method for consuming the int values.

More Related Contents:

  1. Improve condition check
  2. Is there a concise way to iterate over a stream with indices in Java 8?
  3. Why in Java 8 split sometimes removes empty strings at start of result array?
  4. How to ensure order of processing in java8 streams?
  5. Unable to obtain LocalDateTime from TemporalAccessor when parsing LocalDateTime (Java 8)
  6. Can you split a stream into two streams?
  7. Why does parallel stream with lambda in static initializer cause a deadlock?
  8. Java 1.8 ASM ClassReader failed to parse class file – probably due to a new Java class file version that isn’t supported yet
  9. java.lang.NullPointerException is thrown using a method-reference but not a lambda expression
  10. Lambda expression to convert array/List of String to array/List of Integers
  11. Java “lambda expressions not supported at this language level”
  12. Java 8 Streams FlatMap method example
  13. Parallel streams, collectors and thread safety
  14. Java 8, Streams to find the duplicate elements
  15. comparing and thenComparing gives compile error
  16. Fetch first element of stream matching the criteria
  17. Why should one use Objects.requireNonNull()?
  18. Stream.skip behavior with unordered terminal operation
  19. Using streams to convert a list of objects into a string obtained from the toString method
  20. What is the difference between a lambda and a method reference at a runtime level?
  21. Java 8 Collectors.toMap SortedMap
  22. How to group objects when each object could go in multiple groups?
  23. functional interface that takes nothing and returns nothing [duplicate]
  24. Why should I use concurrent characteristic in parallel stream with collect?
  25. Java 8 peek vs map
  26. Using Java8 Stream to find the highest values from map
  27. How to apply Filtering on groupBy in java streams
  28. Group sequences of values
  29. Why StringJoiner when we already have StringBuilder?
  30. Java 8 stream map to list of keys sorted by values

Leave a Comment