By Cay S. Horstmann
Middle Java® has lengthy been well-known because the top, no-nonsense instructional and reference for skilled programmers who are looking to write strong Java code for real-world purposes. Now, center Java®, quantity I—Fundamentals, 10th version, has been widely up-to-date to mirror the main eagerly awaited and cutting edge model of Java in years: Java SE eight. Rewritten and reorganized to light up new Java SE eight positive aspects, idioms, and top practices, it includes hundreds and hundreds of instance programs—all conscientiously crafted for simple knowing and useful applicability.
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Additional resources for Core Java. Vol. II: Advanced Features
Int toArray() yields an array with the elements of this stream. • int sum() • OptionalDouble average() • OptionalInt max() • OptionalInt min() • IntSummaryStatistics summaryStatistics() yields the sum, average, maximum, or minimum of the elements in this stream, or an object from which all four of these results can be obtained. • Stream
To make the expressions easier to read. collect( groupingBy(Locale::getCountry, counting())); counts how many locales there are for each country. collect( groupingBy(City::getState, summingInt(City::getPopulation))); computes the sum of populations per state in a stream of cities. comparing(City::getPopulation)))); produces the largest city per state. Within each state, we produce the names of the cities and reduce by maximum length. The mapping method also yields a nicer solution to a problem from the preceding section— gathering a set of all languages in a country.
Void ifPresent((Int|Long|Double)Consumer consumer) If this optional object is not empty, passes its value to consumer. (Int|Long|Double) SummaryStatistics 8 • long getCount() • (int|long|double) getSum() • double getAverage() • (int|long|double) getMax() • (int|long|double) getMin() yields the count, sum, average, maximum, and minimum of the collected elements. parallelStream(); Moreover, the parallel method converts any sequential stream into a parallel one. parallel(); As long as the stream is in parallel mode when the terminal method executes, all intermediate stream operations will be parallelized.
Core Java. Vol. II: Advanced Features by Cay S. Horstmann