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Java8的stream流中flatMap()方法的作用在Java 8的Stream流中，flatMap()方法用于将流中的每个元素转换为一个新的流，然后将这些新的流合并成一个流。它的作用是扁平化流，将多个流合并为一个流。 flatMap()方法接受一个函数作为参数，该函数将每个流的元素映射为一个...

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java8中stream的flatMap方法跟map方法有什么区别

《Java核心技术卷Ⅱ　高级特性（原书第10版）》一1.3　filter、map和flatMap方法

1.3　filter、map和flatMap方法流的转换会产生一个新的流，它的元素派生自另一个流中的元素。我们已经看到了f?ilter转换会产生一个流，它的元素与某种条件相匹配。下面，我们将一个字符串流转换为了只包含长单词的另一个流： f?ilter的引元是Predicate，即从T到boolea...

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