将增强的循环转换为Java 8流，过滤器

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class StreamExample {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(5, 12, 8, 15, 20);

        // 使用增强的循环
        List<Integer> filteredNumbersUsingLoop = new ArrayList<>();
        for (Integer number : numbers) {
            if (number > 10) {
                filteredNumbersUsingLoop.add(number);
            }
        }

        // 使用Java 8流
        List<Integer> filteredNumbersUsingStream = numbers.stream()
                .filter(number -> number > 10)
                .collect(Collectors.toList());

        System.out.println("Filtered using loop: " + filteredNumbersUsingLoop);
        System.out.println("Filtered using stream: " + filteredNumbersUsingStream);
    }
}

List<String> names = Arrays.asList("Alice", null, "Bob");

// 使用Optional处理null值
List<String> nonNullNames = names.stream()
        .filter(Objects::nonNull)
        .collect(Collectors.toList());

List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);

// 使用线程安全的集合
List<Integer> result = numbers.parallelStream()
        .map(n -> n * 2)
        .collect(Collectors.toCollection(CopyOnWriteArrayList::new));