szetszwo commented on PR #6968:
URL: https://github.com/apache/ozone/pull/6968#issuecomment-2246780971
```java
public static void main(String[] args) {
final int n = 2;
final CompletableFuture<Integer>[] futures = new CompletableFuture[n];
CompletableFuture<Integer> all = CompletableFuture.completedFuture(0);
for(int i = 0; i < futures.length; i++) {
futures[i] = new CompletableFuture<>();
all = all.thenCombine(futures[i], Integer::sum);
}
System.out.println("set break point to check objects");
for(int i = 0; i < futures.length - 1; i++) {
futures[i].complete(i);
}
System.out.println("set break point to check objects again");
final int last = futures.length - 1;
futures[last].complete(last);
System.out.println("all = " + all.join());
}
```
Tried the program above. The `CompletableFuture.thenCombine(..)`
implementation is smart. See my next comment.
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