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@@ -30,6 +30,21 @@ public class Cf08_ManualComplete {
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forced.obtrudeValue("强制更新的结果");
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System.out.println("obtrudeValue 覆盖后: " + forced.join());
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+ // isDone: 查询任务是否"已结束"(成功、失败、取消都算 done)
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+ CompletableFuture<String> pending = new CompletableFuture<>();
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+ System.out.println("刚创建未完成 isDone: " + pending.isDone());
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+ pending.complete("已赋值");
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+ System.out.println("完成后 isDone: " + pending.isDone());
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+
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+ // obtrudeException: 与 obtrudeValue 成对，无论状态如何强制让其以异常结束(慎用)
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+ CompletableFuture<String> forcedErr = CompletableFuture.completedFuture("旧结果");
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+ forcedErr.obtrudeException(new RuntimeException("强制失败"));
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+ try {
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+ forcedErr.join();
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+ } catch (Exception e) {
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+ System.out.println("obtrudeException 后异常: " + e.getCause());
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+ }
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+
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// cancel: 取消任务, isCancelled 与 isCompletedExceptionally 都会为 true
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CompletableFuture<String> cancelling = new CompletableFuture<>();
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System.out.println("cancel() 返回值: " + cancelling.cancel(true));
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