CompositeFuture不使用期货返回列表

import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class CompositeFutureExample {
    public static void main(String[] args) {
        List<CompletableFuture<Integer>> futures = IntStream.range(0, 10)
            .mapToObj(i -> CompletableFuture.supplyAsync(() -> {
                // 模拟耗时操作
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    throw new IllegalStateException(e);
                }
                return i * 2;
            }))
            .collect(Collectors.toList());

        CompletableFuture<Void> allFutures = CompletableFuture.allOf(
            futures.toArray(new CompletableFuture[0])
        );

        allFutures.thenRun(() -> {
            futures.forEach(future -> {
                try {
                    System.out.println(future.get());
                } catch (Exception e) {
                    e.printStackTrace();
                }
            });
        });

        // 防止主线程提前结束
        allFutures.join();
    }
}