Like it was explained in @RealSkeptic comment Predicate can return only two results: true and false. This means you would be able to split your data only in two groups. What you need is some kind of Function which will allow you to determine some common result for elements which should be grouped together. In … Read more
There are many ways to convert LocalDateTime to OffsetDateTime. Some of them are listed below: 1. Using LocalDateTime#atOffset(ZoneOffset offset): LocalDateTime ldt = LocalDateTime.now(); ZoneOffset offset = ZoneOffset.UTC; OffsetDateTime odt = ldt.atOffset(offset); 2. Using LocalDateTime#atZone(ZoneId zone) => ZonedDateTime#toOffsetDateTime(): LocalDateTime ldt = LocalDateTime.now(); // Change the ZoneId as required e.g. ZoneId.of(“Europe/London”) ZoneId zoneId = ZoneId.systemDefault(); OffsetDateTime odt … Read more
The Javadoc mentions the following: Intermediate operations return a new stream. They are always lazy; executing an intermediate operation such as filter() does not actually perform any filtering, but instead creates a new stream that, when traversed, contains the elements of the initial stream that match the given predicate. Traversal of the pipeline source does … Read more
Change the last bit to: .thenComparing(Student::getID, Comparator.reverseOrder()) Or, if you want to avoid autoboxing: .thenComparing(Comparator.comparingInt(Student::getID).reversed())
This will incur an overhead of creating a set but it’s simple and will work correctly even if you forget to distinct() the stream first. static<T> Collector<T,?,Optional<T>> singleOrEmpty() { return Collectors.collectingAndThen( Collectors.toSet(), set -> set.size() == 1 ? set.stream().findAny() : Optional.empty() ); }
From their task tracker — SPR-16391:Compatibility with JDK 11. The compatibility of JDK 10, 11 is planned along with 5.1 GA release. JDK 11 is currently scheduled for September 2018. Not expecting any major changes beyond JDK 10 from our perspective, we should be able to fully support it in the 5.1 line already. Ideally … Read more
In the Analyze menu, select “Run Inspection by Name…”. In the search box, type “Anonymous” and select the one that says “Anonymous class may be replaced by lambda” or something to that effect. Select your scope and start the analysis. In the results, you can inspect them individually and click the “Replace with lambda” link … Read more
For year you have to use the lowercase y: final DateTimeFormatter DATE_FORMAT = DateTimeFormatter.ofPattern(“dd-MM-yyyy”); Uppercase Y is used for weekyear. See the javadoc of DateTimeFormatter for more details.
The general idea is that 8u151 (tag jdk8u151-b12) is a Critical Patch Update (CPU) Release 8u152 (tag jdk8u152-b16) is a Patch Set Update (PSU) Release From official Oracle CPU and PSU Releases Explained Starting with the release of Java SE 7 Update 71 (Java SE 7u71) in October 2014, Oracle will release a Critical Patch … Read more
Use flatMap: List<Integer> concat = examples.stream() .flatMap(e -> e.getIds().stream()) .collect(Collectors.toList());