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                ### [信息](https://lingcoder.gitee.io/onjava8/#/book/14-Streams?id=%e4%bf%a1%e6%81%af) * `count()`:流中的元素個數。 * `max(Comparator)`:根據所傳入的**Comparator**所決定的“最大”元素。 * `min(Comparator)`:根據所傳入的**Comparator**所決定的“最小”元素。 **String**類型有預設的**Comparator**實現。代碼示例: ~~~ // streams/Informational.java import java.util.stream.*; import java.util.function.*; public class Informational { public static void main(String[] args) throws Exception { System.out.println( FileToWords.stream("Cheese.dat").count()); System.out.println( FileToWords.stream("Cheese.dat") .min(String.CASE_INSENSITIVE_ORDER) .orElse("NONE")); System.out.println( FileToWords.stream("Cheese.dat") .max(String.CASE_INSENSITIVE_ORDER) .orElse("NONE")); } } ~~~ 輸出結果: ~~~ 32 a you ~~~ `min()`和`max()`的返回類型為**Optional**,這需要我們使用`orElse()`來解包。
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