Java 8流式编程：处理复杂数据的实战案例-蒲公英云

Java 8流式编程：处理复杂数据的实战案例

原创缺乏、安全感 2024-09-11 21:21 176阅读 0赞

流式编程是Java 8引入的一种新的编程模式，主要用于处理大量数据，提高代码可读性和执行效率。下面我将为你提供几个实战案例：

数组排序：

Integer[] numbers = {5, 2, 9, 1};
List<Integer> sortedList = IntStream.of(numbers)
                                                              .sorted()
                                                              .collect(Collectors.toList()));
System.out.println(sortedList); // 输出：[1, 2, 5, 9]

处理XML：

import java.util.stream.Collectors;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
XMLData xml = ... // 假设你有一个XML数据对象
JAXBContext context = JAXBContext.newInstance(xml.getClass());
Unmarshaller unmarshaller = context.createUnmarshaller();
List<String> valuesFromXML = unmarshaller.unmarshal(xml)
                                                                           .getValueList()
                                                                           .stream()
                                                                           .map(String::valueOf)
                                                                           .collect(Collectors.toList()));
System.out.println(valuesFromXML); // 输出：[value1, value2, ...]

并发任务：

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
List<String> tasks = ... // 假设你有一个待执行的任务列表
ExecutorService executor = Executors.newFixedThreadPool(tasks.size()));
Map<String, Future<String>> futures = tasks.stream()
                                                                                .collect(Collectors.toMap(task -> task, future -> FutureTask::new(future)))));
for (Map.Entry<String, Future<String>>> entry : futures.entrySet()) {
    executor.submit(entry.getValue()));
}
// 等待所有任务完成
for (Future<String> future : futures.values()) {
    try {
        System.out.println("Task result: " + future.get());
    } catch (Exception e) {
        System.err.println("Failed to get task result: " + e.getMessage());
    }
}
// 关闭线程池
executor.shutdown();