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Update completablefuture-intro.md

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docs/java/concurrent/completablefuture-intro.md
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@ -418,7 +418,7 @@ assertEquals("hello!world!nice!", completableFuture.get());
**那 `thenCompose()` 和 `thenCombine()` 有什么区别呢？**
- `thenCompose()` 可以两个 `CompletableFuture` 对象，并将前一个任务的返回结果作为下一个任务的参数，它们之间存在着先后顺序。
- `thenCompose()` 可以链接两个 `CompletableFuture` 对象，并将前一个任务的返回结果作为下一个任务的参数，它们之间存在着先后顺序。
- `thenCombine()` 会在两个任务都执行完成后，把两个任务的结果合并。两个任务是并行执行的，它们之间并没有先后依赖顺序。
### 并行运行多个 CompletableFuture