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                ### [數字流信息](https://lingcoder.gitee.io/onjava8/#/book/14-Streams?id=%e6%95%b0%e5%ad%97%e6%b5%81%e4%bf%a1%e6%81%af) * `average()`:求取流元素平均值。 * `max()`和`min()`:數值流操作無需**Comparator**。 * `sum()`:對所有流元素進行求和。 * `summaryStatistics()`:生成可能有用的數據。目前并不太清楚這個方法存在的必要性,因為我們其實可以用更直接的方法獲得需要的數據。 ~~~ // streams/NumericStreamInfo.java import java.util.stream.*; import static streams.RandInts.*; public class NumericStreamInfo { public static void main(String[] args) { System.out.println(rands().average().getAsDouble()); System.out.println(rands().max().getAsInt()); System.out.println(rands().min().getAsInt()); System.out.println(rands().sum()); System.out.println(rands().summaryStatistics()); } } ~~~ 輸出結果: ~~~ 507.94 998 8 50794 IntSummaryStatistics{count=100, sum=50794, min=8, average=507.940000, max=998} ~~~ 上例操作對于**LongStream**和**DoubleStream**同樣適用。
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