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在Java 8及以上的版本中，Stream中的map方法可以用于对Stream中的每个元素应用一个函数，并将结果存储在一个新的Stream中。具体用法如下：
// 创建一个Stream对象 Stream<T> stream = ...; // 应用函数mapFunction Stream<R>
mappedStream = stream.map(element -> mapFunction(element));
其中，mapFunction是一个函数，接受一个元素类型为T的参数，并返回一个类型为R的结果。map方法返回一个新的Stream对象，其中每个元素都是通过应用
mapFunction函数得到的结果。
以下是一个示例，展示如何使用map方法将一个Stream中的字符串元素转换为大写字母：
List<String> strings = Arrays.asList("hello", "world", "java"); Stream<String>
stream = strings.stream(); // 使用方法引用将字符串转换为大写字母 Stream<String> upperCaseStream
= stream.map(String::toUpperCase); // 输出结果为：HELLO WORLD JAVA
upperCaseStream.forEach(System.out::println);
在上述示例中，我们首先使用Arrays.asList方法创建了一个包含字符串元素的List对象。然后，我们通过stream方法将其转换为一个Stream
对象，并通过map方法将每个字符串元素转换为大写字母，最后通过forEach方法遍历输出转换后的结果。
