{"id":2241,"date":"2018-02-09T16:50:47","date_gmt":"2018-02-09T08:50:47","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=2241"},"modified":"2026-08-18T12:09:39","modified_gmt":"2026-08-18T04:09:39","slug":"java8%e6%96%b0%e7%9a%84%e5%bc%82%e6%ad%a5%e7%bc%96%e7%a8%8b%e6%96%b9%e5%bc%8f-completablefuture%e4%b8%80","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=2241","title":{"rendered":"Java8\u65b0\u7684\u5f02\u6b65\u7f16\u7a0b\u65b9\u5f0f CompletableFuture(\u4e00)"},"content":{"rendered":"<section id=\"wenyan\" style=\"font-family: system-ui, 'Apple Color Emoji', 'Segoe UI', 'Segoe UI Symbol', 'Noto Sans', Roboto, sans-serif; line-height: 1.75; font-size: 16px; color: #000000; caret-color: #000000;\" data-provider=\"WenYan\">\n<p style=\"margin: 1em 0px;\">JDK 5 \u5f15\u5165 <strong style=\"color: #4870ac;\">Future<\/strong>\uff0c\u628a\u300c\u628a\u4efb\u52a1\u4ea4\u51fa\u53bb\u3001\u8fc7\u4f1a\u513f\u518d\u53d6\u7ed3\u679c\u300d\u5199\u6210\u63a5\u53e3\uff1bJava 8 \u7684 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">CompletableFuture<\/code> \u8865\u4e0a\u56de\u8c03\u548c\u7ec4\u5408\uff0c\u624d\u7b97\u6709\u5b8c\u6574\u7684 Future \/ Promise \/ Callback\u3002<\/p>\n<p style=\"margin: 1em 0px;\">Future \u6a21\u5f0f\uff1a\u6211\u6709\u4efb\u52a1\u4ea4\u7ed9 Future\uff0c\u671f\u95f4\u6211\u53ef\u4ee5\u5e72\u522b\u7684\uff0c\u7a0d\u540e\u518d <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">get<\/code>\u3002\u63a5\u53e3\u53ea\u6709\u4e94\u4e2a\u65b9\u6cd5\u3002<\/p>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e00\u3001Future<\/h2>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">public interface Future&lt;V&gt; {\n\n    boolean cancel(boolean mayInterruptIfRunning);\n\n    boolean isCancelled();\n\n    boolean isDone();\n\n    V get() throws InterruptedException, ExecutionException;\n\n    V get(long timeout, TimeUnit unit)\n\n        throws InterruptedException, ExecutionException, TimeoutException;\n\n}<\/code><\/pre>\n<ul style=\"padding-left: 1rem; margin-left: 1rem; font-size: 0.9rem; list-style-type: disc;\">\n<li>\n<section><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">cancel(boolean)<\/code>\uff1a\u53d6\u6d88\uff1b\u53c2\u6570\u51b3\u5b9a\u662f\u5426\u7acb\u523b\u4e2d\u65ad\u3002<\/section>\n<\/li>\n<li>\n<section><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">isCancelled()<\/code>\uff1a\u6b63\u5e38\u5b8c\u6210\u524d\u88ab\u53d6\u6d88\u5219 true\u3002<\/section>\n<\/li>\n<li>\n<section><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">isDone()<\/code>\uff1a\u6b63\u5e38\u7ed3\u675f\u3001\u5f02\u5e38\u6216\u53d6\u6d88\u90fd\u7b97\u5b8c\u6210\u3002<\/section>\n<\/li>\n<li>\n<section><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">get()<\/code>\uff1a\u963b\u585e\u7b49\u5230\u7ed3\u679c\uff1b\u4e2d\u65ad\u3001\u6267\u884c\u5f02\u5e38\u3001\u53d6\u6d88\u4f1a\u629b\u76f8\u5e94\u5f02\u5e38\u3002<\/section>\n<\/li>\n<li>\n<section><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">get(timeout, unit)<\/code>\uff1a\u5e26\u8d85\u65f6\uff0c\u8d85\u65f6\u629b TimeoutException\u3002<\/section>\n<\/li>\n<\/ul>\n<p style=\"margin: 1em 0px;\">\u4e00\u822c\u548c <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">Callable<\/code> \u4e00\u8d77\u7528\uff1a<code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">ExecutorService.submit<\/code> \u8fd4\u56de Future\u3002<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">ExecutorService executor = Executors.newCachedThreadPool();\n\n        Future&lt;String&gt; future = executor.submit(() -&gt; { \/\/Lambda \u662f\u4e00\u4e2a callable\uff0c \u63d0\u4ea4\u540e\u4fbf\u7acb\u5373\u6267\u884c\uff0c\u8fd9\u91cc\u8fd4\u56de\u7684\u662f FutureTask \u5b9e\u4f8b\n\n            System.out.println(\"running task\");\n\n            Thread.sleep(10000);\n\n            return \"return task\";\n\n        });\n\n        try {\n\n            Thread.sleep(1000);\n\n        } catch (InterruptedException e) {\n\n        }\n\n        System.out.println(\"do something else\");  \/\/\u524d\u9762\u7684\u7684 Callable \u5728\u5176\u4ed6\u7ebf\u7a0b\u4e2d\u8fd0\u884c\u7740\uff0c\u53ef\u4ee5\u505a\u4e00\u4e9b\u5176\u4ed6\u7684\u4e8b\u60c5\n\n        try {\n\n            System.out.println(future.get());  \/\/\u7b49\u5f85 future \u7684\u6267\u884c\u7ed3\u679c\uff0c\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\u6253\u5370\u51fa\u6765\n\n        } catch (InterruptedException e) {\n\n        } catch (ExecutionException e) {\n\n        } finally {\n\n            executor.shutdown();\n\n        }<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u6bd4\u8d77\u88f8 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">get()<\/code>\uff0c\u66f4\u63a8\u8350\u5e26\u8d85\u65f6\u7684 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">get(long, TimeUnit)<\/code>\uff0c\u907f\u514d\u65e0\u9650\u7b49\u3002<\/p>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e8c\u3001Future \u7684\u77ed\u677f\u4e0e CompletableFuture<\/h2>\n<ul style=\"padding-left: 1rem; margin-left: 1rem; font-size: 0.9rem; list-style-type: disc;\">\n<li>\n<section>\u80fd\u53d6\u5f02\u6b65\u7ed3\u679c\uff0c\u4f46\u6ca1\u6709\u5b8c\u6210\u901a\u77e5\u3002<\/section>\n<\/li>\n<li>\n<section>\u8981\u4e48 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">get()<\/code> \u963b\u585e\u53d8\u56de\u540c\u6b65\uff0c\u8981\u4e48 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">isDone()<\/code> \u8f6e\u8be2\u8017 CPU\u3002<\/section>\n<\/li>\n<\/ul>\n<p style=\"margin: 1em 0px;\">Netty\u3001Guava \u90fd\u6269\u5c55\u8fc7 Future\u3002Java 8 \u7684 CompletableFuture \u5438\u6536\u4e86 Guava ListenableFuture \/ SettableFuture\uff0c\u5e76\u628a\u56de\u8c03\u653e\u5230\u522b\u7684\u7ebf\u7a0b\uff0c\u6216\u5f53\u4f5c\u540c\u4e00\u7ebf\u7a0b\u91cc\u7684\u540c\u6b65\u7ee7\u7eed\u3002\u4efb\u52a1\u5b8c\u6210\u540e\u8981\u7528\u7ed3\u679c\uff0c\u4e0d\u5fc5\u5e72\u7b49\uff0c\u53ef <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">thenAccept<\/code> \/ <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">thenApply<\/code> \/ <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">thenCompose<\/code> \u4ea4\u7ed9\u4e0b\u4e00\u6bb5\u3002<\/p>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u4e09\u3001\u9759\u6001\u5de5\u5382\uff1arunAsync \u4e0e supplyAsync<\/h2>\n<p style=\"margin: 1em 0px;\"><a href=\"https:\/\/ai.zhousir.top\/wp-content\/uploads\/2018\/02\/completablefutrue.png\" rel=\"fancybox\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-2243\" src=\"https:\/\/ai.zhousir.top\/wp-content\/uploads\/2018\/02\/completablefutrue.png\" alt=\"completablefutrue\" width=\"631\" height=\"276\" \/><\/a><\/p>\n<p style=\"margin: 1em 0px;\"><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">runAsync<\/code> \u8fd4\u56de\u7684 CompletableFuture \u6ca1\u6709\u4e1a\u52a1\u8fd4\u56de\u503c\uff1b<code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">supplyAsync<\/code> \u6709\u3002\u4e0b\u9762\u4e24\u6bb5\u5206\u522b\u5bf9\u5e94\u8fd9\u4e24\u79cd\u5de5\u5382\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">System.out.println(\"Hello\");\n\n        });\n\n        try {\n\n            future.get();\n\n        } catch (InterruptedException e) {\n\n            e.printStackTrace();\n\n        } catch (ExecutionException e) {\n\n            e.printStackTrace();\n\n        }\n\n        System.out.println(\"CompletableFuture\");<\/code><\/pre>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">CompletableFuture&lt;String&gt; future = CompletableFuture.supplyAsync(() -&gt; \"Hello\");\n\n        try {\n\n            System.out.println(future.get());\n\n        } catch (InterruptedException e) {\n\n            e.printStackTrace();\n\n        } catch (ExecutionException e) {\n\n            e.printStackTrace();\n\n        }\n\n        System.out.println(\"CompletableFuture\");<\/code><\/pre>\n<h2 style=\"padding: 1px 12.5px; color: #ffffff; margin: 1.2em 0px 1em; border-radius: 4px; display: inline-block; background-color: #4870ac; font-size: 1.3em;\">\u56db\u3001complete \u4e0e completeExceptionally<\/h2>\n<table style=\"display: table; text-align: left; overflow: auto; border-collapse: collapse; margin: 1.4em auto; max-width: 100%; table-layout: fixed; overflow-wrap: break-word; word-break: break-all;\" width=\"800\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top; text-align: center; font-weight: bold; color: #4870ac; background: #f7f7f7;\">\u65b9\u6cd5<\/th>\n<th style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top; text-align: center; font-weight: bold; color: #4870ac; background: #f7f7f7;\">\u542b\u4e49<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\"><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">complete(T t)<\/code><\/td>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u5b8c\u6210\u5f02\u6b65\u6267\u884c\uff0c\u5e76\u7ed9\u51fa\u7ed3\u679c<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\"><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">completeExceptionally(Throwable)<\/code><\/td>\n<td style=\"border: 1px solid #d9dfe4; padding: 9px 12px; font-size: 0.75em; line-height: 22px; vertical-align: top;\">\u4ee5\u5f02\u5e38\u7ed3\u675f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin: 1em 0px;\"><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">get()<\/code> \u4f1a\u4e00\u76f4 block\uff1b\u82e5\u6b64\u65f6 <code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">complete<\/code>\uff0c\u4f1a\u7acb\u523b\u4ee5\u7ed9\u5b9a\u503c\u7ed3\u675f\u3002\u53ea\u80fd\u6210\u529f\u4e00\u6b21\uff0c\u540e\u7eed\u91cd\u590d\u8c03\u7528\u65e0\u6548\u3002<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">CompletableFuture&lt;String&gt; future  = CompletableFuture.supplyAsync(() -&gt; \"Hello\");\n\n        future.complete(\"World\");\n\n        try {\n\n            System.out.println(future.get());\n\n        } catch (InterruptedException e) {\n\n            e.printStackTrace();\n\n        } catch (ExecutionException e) {\n\n            e.printStackTrace();\n\n        }<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u6267\u884c\u7ed3\u679c\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">World<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u82e5 Future \u5df2\u7ecf\u80fd\u8fd4\u56de\u7ed3\u679c\uff0c\u518d complete \u5c31\u65e0\u6548\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">CompletableFuture&lt;String&gt; future = CompletableFuture.supplyAsync(() -&gt; \"Hello\");\n\n        try {\n\n            Thread.sleep(5000);\n\n        } catch (InterruptedException e) {\n\n            e.printStackTrace();\n\n        }\n\n        future.complete(\"World\");\n\n        try {\n\n            System.out.println(future.get());\n\n        } catch (InterruptedException e) {\n\n            e.printStackTrace();\n\n        } catch (ExecutionException e) {\n\n            e.printStackTrace();\n\n        }<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u6267\u884c\u7ed3\u679c\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">Hello<\/code><\/pre>\n<p style=\"margin: 1em 0px;\"><code style=\"font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; color: #4870ac; font-size: 0.9em; font-weight: normal; overflow-wrap: break-word; padding: 2px 4px; border-radius: 3px; margin: 2px; background-color: #f6f8fa; word-break: break-all;\">completeExceptionally<\/code> \u5219\u8ba9 get \u770b\u5230\u5f02\u5e38\u800c\u4e0d\u662f\u6210\u529f\u503c\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">CompletableFuture&lt;String&gt; future = CompletableFuture.supplyAsync(() -&gt; \"Hello\");\n\n        future.completeExceptionally(new Exception());\n\n        try {\n\n            System.out.println(future.get());\n\n        } catch (InterruptedException e) {\n\n            e.printStackTrace();\n\n        } catch (ExecutionException e) {\n\n            e.printStackTrace();\n\n        }<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u6267\u884c\u7ed3\u679c\uff1a<\/p>\n<pre style=\"overflow: auto hidden; word-break: normal; white-space: pre; tab-size: 2; border-radius: 5px; line-height: 2; margin: 1em 0.5em; padding: 0.5em; box-shadow: rgba(0, 0, 0, 0.55) 0px 1px 5px; font-size: 12px; background: #002b36; max-width: 100%; overflow-wrap: normal;\"><code class=\"hljs\" style=\"word-break: normal; white-space: nowrap; tab-size: 2; font-size: 12px; font-family: Menlo, Monaco, Consolas, 'Liberation Mono', 'Roboto Mono', 'Courier New', 'Microsoft YaHei', monospace; display: block; overflow-x: auto; margin: 0.5em; padding: 3px 5px; color: #93a1a1; background: #002b36; overflow-wrap: normal;\">java.util.concurrent.ExecutionException: java.lang.Exception\n\n...<\/code><\/pre>\n<p style=\"margin: 1em 0px;\">\u539f\u6587\u7cfb\u5217\uff1a<a href=\"https:\/\/www.jianshu.com\/p\/dff9063e1ab6\" target=\"_blank\">CompletableFuture(\u4e00)<\/a>\u3001<a href=\"https:\/\/www.jianshu.com\/p\/d81cf0beb858\" target=\"_blank\">\uff08\u4e8c\uff09<\/a>\u3001<a class=\"title\" href=\"https:\/\/www.jianshu.com\/p\/807e6822292a?utm_campaign=maleskine&amp;utm_content=note&amp;utm_medium=pc_all_hots&amp;utm_source=recommendation\" target=\"_blank\">\uff08\u4e09\uff09<\/a>\u3002<\/p>\n<blockquote style=\"display: block; font-size: 0.9em; border-left: 3px solid #4870ac; padding: 0.5em 1em; margin: 0px; background: #f6f8fa; color: #40464f;\">\n<p style=\"margin: 1em 0px;\"><strong style=\"color: #4870ac;\">\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1aFuture \u53ea\u80fd\u63d0\u4ea4\u518d\u963b\u585e\/\u8f6e\u8be2\u53d6\u7ed3\u679c\uff1bCompletableFuture \u7528\u5de5\u5382\u65b9\u6cd5\u542f\u52a8\u4efb\u52a1\uff0c\u518d\u7528 complete \u6216\u56de\u8c03\u94fe\u628a\u300c\u5b8c\u6210\u540e\u5e72\u4ec0\u4e48\u300d\u63a5\u4e0a\uff0c\u624d\u662f Java 8 \u7684\u5f02\u6b65\u7ec4\u5408\u65b9\u5f0f\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>JDK 5 \u5f15\u5165 Future\uff0c\u628a\u300c\u628a\u4efb\u52a1\u4ea4\u51fa\u53bb\u3001\u8fc7\u4f1a\u513f\u518d\u53d6\u7ed3\u679c\u300d\u5199\u6210\u63a5\u53e3\uff1bJava 8 \u7684 Completa [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[103],"tags":[97],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2241"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2241"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2241\/revisions"}],"predecessor-version":[{"id":2247,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/2241\/revisions\/2247"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2241"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2241"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}