Read e-book online Core Java. Vol. II: Advanced Features PDF

By Cay S. Horstmann

ISBN-10: 0134177304

ISBN-13: 9780134177304

Center Java® has lengthy been famous because the major, no-nonsense educational and reference for knowledgeable programmers who are looking to write powerful Java code for real-world purposes. Now, center Java®, quantity I—Fundamentals, 10th version, has been generally up to date to mirror the main eagerly awaited and leading edge model of Java in years: Java SE eight. Rewritten and reorganized to light up new Java SE eight good points, idioms, and most sensible practices, it includes 1000's of instance programs—all rigorously crafted for simple figuring out and useful applicability.

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FlatMap method works in the same way if you interpret an optional value as a stream of size zero or one. 3 demonstrates the Optional API. super T,Optional> mapper) yields the result of applying mapper to the value of this Optional, or an empty Optional if this Optional is empty. You can call the iterator method, which yields an old-fashioned iterator that you can use to visit the elements. Of course, you might then give up some or all of the benefits of parallelism. You can call toArray and get an array of the stream elements.

Object[] toArray() • A[] toArray(IntFunction generator) yields an array of objects, or of type A when passed a constructor reference A[]::new. These are terminal operations. The Collectors class has factory methods for many collectors. ,Set> toSet() yields collectors that collect elements in a list or set. Pass a constructor reference such as TreeSet::new. When not specified, these are empty. ,IntSummaryStatistics> summarizingInt(ToIntFunction mapper) yields collectors that produce an (Int|Long|Double)SummaryStatistics object, from which you can obtain the count, sum, average, maximum, and minimum of the results of applying mapper to each element.

Super T> mapper) yields a collector that computes the sum of the values of applying mapper to the collected elements. super T> comparator) yields a collector that computes the maximum or minimum of the collected elements, using the ordering specified by comparator. super U,A,R> downstream) yields a collector that produces a map whose keys are mapper applied to the collected elements, and whose values are the result of collecting the elements with the same key using the downstream collector. The method returns an Optional because there is no valid result if the stream is empty.

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