There actually is a trick how to execute a parallel operation in a specific fork-join pool. If you execute it as a task in a fork-join pool, it stays there and does not use the common one. final int parallelism = 4; ForkJoinPool forkJoinPool = null; try { forkJoinPool = new ForkJoinPool(parallelism); final List<Integer> primes … Read more
Operations takeWhile and dropWhile have been added to JDK 9. Your example code IntStream .iterate(1, n -> n + 1) .takeWhile(n -> n < 10) .forEach(System.out::println); will behave exactly as you expect it to when compiled and run under JDK 9. JDK 9 has been released. It is available for download here: JDK 9 Releases.
java 8 Android supports all Java 7 language features and a subset of Java 8 language features that vary by platform version. To check which features of java 8 are supported Use Java 8 language features We’ve decided to add support for Java 8 language features directly into the current javac and dx set of … Read more
The main design goal of Optional is to provide a means for a function returning a value to indicate the absence of a return value. See this discussion. This allows the caller to continue a chain of fluent method calls. This most closely matches use case #1 in the OP’s question. Although, absence of a … Read more
If you have Guava in your project, you can use the Streams.zip method (was added in Guava 21): Returns a stream in which each element is the result of passing the corresponding element of each of streamA and streamB to function. The resulting stream will only be as long as the shorter of the two … Read more
Java 8 Distinct by property
:: is called Method Reference. It is basically a reference to a single method. i.e. it refers to an existing method by name. Short Explanation: Below is an example of a reference to a static method: class Hey { public static double square(double num){ return Math.pow(num, 2); } } Function<Double, Double> square = Hey::square; double … Read more