There are two different aspects. First, there is only a single pipeline which is either sequential or parallel. The choice of sequential or parallel at the inner stream is irrelevant. Note that the downstream consumer you see in the cited code snippet represents the entire subsequent stream pipeline, so in your code, ending with .collect(Collectors.toSet());, … Read more
While Drag and Drop in JavaFX has a common API for all the platforms (as the rest of the API, of course), its internal implementation is platform dependent, and it is quite different on Windows, Mac or Linux. But this shouldn’t be an issue when migrating from JavaFX 8 to JavaFX 11, though. The sample … Read more
Short answer: The new API java.time is way better than the old world with java.util.Date and java.util.Calendar. So yes, the new API should be preferred in new code. For a quick overview: Once I had written a comparison of features in table form for various date-time-libraries. There is almost no feature which java.time is missing … Read more
Short answer: The new API java.time is way better than the old world with java.util.Date and java.util.Calendar. So yes, the new API should be preferred in new code. For a quick overview: Once I had written a comparison of features in table form for various date-time-libraries. There is almost no feature which java.time is missing … Read more
My approach to bulk operations with chunking is to use a partitioning spliterator wrapper, and another wrapper which overrides the default splitting policy (arithmetic progression of batch sizes in increments of 1024) to simple fixed-batch splitting. Use it like this: Stream<OriginalType> existingStream = …; Stream<List<OriginalType>> partitioned = partition(existingStream, 100, 1); partitioned.forEach(chunk -> … process the … Read more
You could use map() to get a Stream of region lists and then mapToInt to get the number of regions for each country. After that use sum() to get the sum of all the values in the IntStream: countries.stream().map(Country::getRegions) // now it’s a stream of regions .filter(rs -> rs != null) // remove regions lists … Read more
A Stream supports several operations and these operations are divided into intermediate and terminal operations. The distinction between this operations is that an intermediate operation is lazy while a terminal operation is not. When you invoke an intermediate operation on a stream, the operation is not executed immediately. It is executed only when a terminal … Read more
The error means that your bundle has a Require-Capability: osgi.ee; filter=”(&(osgi.ee=JavaSE)(version=1.8))” entry in its manifest. So this means the bundle will only start when there is a bundle that provides this capability. In case of the osgi.ee capability it is the OSGi framework (equinox) that should provide this capability. Apparently it does not do this. … Read more
You can use Stream APIs of Java 8 int[] intArray = Arrays.stream(array).mapToInt(Integer::intValue).toArray();
Java 8’s Optional was mainly intended for return values from methods, and not for properties of Java classes, as described in Optional in Java SE 8: Of course, people will do what they want. But we did have a clear intention when adding this feature, and it was not to be a general purpose Maybe … Read more