{"id":202925,"date":"2025-05-22T09:52:25","date_gmt":"2025-05-22T01:52:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202925\/"},"modified":"2025-05-22T09:52:25","modified_gmt":"2025-05-22T01:52:25","slug":"java-%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e5%a6%82%e4%bd%95%e5%a4%84%e7%90%86%e9%9d%9e%e6%a3%80%e6%9f%a5%e6%80%a7%e5%bc%82%e5%b8%b8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202925\/","title":{"rendered":"Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u5904\u7406\u975e\u68c0\u67e5\u6027\u5f02\u5e38\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u5904\u7406\u975e\u68c0\u67e5\u6027\u5f02\u5e38\uff1f<\/h1>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u6211\u4eec\u8981\u52aa\u529b\u5b66\u4e60\u5566\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300aJava \u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u5904\u7406\u975e\u68c0\u67e5\u6027\u5f02\u5e38\uff1f\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4e0b\u6587\u4e2d\u7684\u5185\u5bb9\u6211\u4eec\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5728\u9605\u8bfb\u672c\u6587\u8fc7\u7a0b\u4e2d\u6709\u9047\u5230\u4e0d\u6e05\u695a\u7684\u5730\u65b9\uff0c\u6b22\u8fce\u7559\u8a00\u5440\uff01\u6211\u4eec\u4e00\u8d77\u8ba8\u8bba\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

\u5728 Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u5904\u7406\u975e\u68c0\u67e5\u6027\u5f02\u5e38\u81f3\u5173\u91cd\u8981\uff0c\u53ef\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a1. \u4f7f\u7528 try-catch \u8bed\u6cd5\uff1b2. \u4f7f\u7528 lambda\uff0c\u5982\u679c\u53d1\u751f\u5f02\u5e38\uff0c\u5c06\u4f1a\u629b\u51fa UncheckedExecutionException\uff1b3. \u4f7f\u7528 unchecked \u4fee\u9970\u7b26\u5c06\u68c0\u67e5\u6027\u5f02\u5e38\u8f6c\u6362\u4e3a\u975e\u68c0\u67e5\u6027\u5f02\u5e38\uff1b4. \u4f7f\u7528 CompletableFuture \u7684 handle \u65b9\u6cd5\u8f7b\u677e\u5904\u7406\u5f02\u5e38\u3002\u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u521b\u5efa\u5065\u58ee\u4e14\u4e0d\u6613\u51fa\u9519\u7684\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n

<\/p>\n

Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u5f02\u5e38\u5904\u7406\uff1a\u5904\u7406\u975e\u68c0\u67e5\u6027\u5f02\u5e38<\/strong><\/p>\n

\u5728 Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u5904\u7406\u975e\u68c0\u67e5\u6027\u5f02\u5e38\uff08RuntimeException\uff09\u81f3\u5173\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u4eec\u65e0\u6cd5\u88ab\u7f16\u8bd1\u5668\u6355\u83b7\u3002\u6b63\u786e\u5904\u7406\u8fd9\u4e9b\u5f02\u5e38\u53ef\u4ee5\u9632\u6b62\u4ee3\u7801\u5d29\u6e83\u548c\u4fdd\u6301\u5e94\u7528\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\u3002<\/p>\n

\u4f7f\u7528 try-catch<\/strong><\/p>\n

\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u4f20\u7edf\u7684 try-catch \u8bed\u6cd5\uff1a<\/p>\n

try {\n    \/\/ \u53ef\u80fd\u4f1a\u629b\u51fa\u975e\u68c0\u67e5\u6027\u5f02\u5e38\u7684\u4ee3\u7801\n} catch (RuntimeException e) {\n    \/\/ \u5904\u7406\u5f02\u5e38\n}<\/pre>\n
\u4f7f\u7528 lambda<\/strong><\/p>\n
Lambda \u8868\u8fbe\u5f0f\u53ef\u4ee5\u7b80\u5316\u5f02\u5e38\u5904\u7406\uff1a<\/p>\n
supplier.get(() -> {\n    \/\/ \u53ef\u80fd\u4f1a\u629b\u51fa\u975e\u68c0\u67e5\u6027\u5f02\u5e38\u7684\u4ee3\u7801\n});<\/pre>\n
\u5982\u679c lambda \u4e2d\u53d1\u751f\u975e\u68c0\u67e5\u6027\u5f02\u5e38\uff0c\u5c06\u4f1a\u629b\u51fa UncheckedExecutionException<\/code>\u3002<\/p>\n
\u4f7f\u7528 unchecked<\/strong><\/p>\n
Java 10 \u5f15\u5165\u4e86 unchecked<\/code> \u4fee\u9970\u7b26\uff0c\u53ef\u4ee5\u5c06\u68c0\u67e5\u6027\u5f02\u5e38\u8f6c\u6362\u4e3a\u975e\u68c0\u67e5\u6027\u5f02\u5e38\uff1a<\/p>\n
try {\n    unchecked(() -> {\n        \/\/ \u53ef\u80fd\u4f1a\u629b\u51fa\u68c0\u67e5\u6027\u5f02\u5e38\u7684\u4ee3\u7801\n    });\n} catch (RuntimeException e) {\n    \/\/ \u5904\u7406\u5f02\u5e38\n}<\/pre>\n
\u4f7f\u7528 CompletableFuture<\/strong><\/p>\n
CompletableFuture \u63d0\u4f9b\u4e86 handle<\/code> \u65b9\u6cd5\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u5904\u7406\u975e\u68c0\u67e5\u6027\u5f02\u5e38\uff1a<\/p>\n
CompletableFuture.supplyAsync(() -> {\n    \/\/ \u53ef\u80fd\u4f1a\u629b\u51fa\u975e\u68c0\u67e5\u6027\u5f02\u5e38\u7684\u4ee3\u7801\n})\n.handle((result, throwable) -> {\n    if (throwable != null) {\n        \/\/ \u5904\u7406\u5f02\u5e38\n    }\n    \/\/ \u5904\u7406\u7ed3\u679c\n});<\/pre>\n
\u5b9e\u6218\u6848\u4f8b\uff1a\u8bfb\u53d6\u6587\u4ef6<\/strong><\/p>\n
\u8003\u8651\u4f7f\u7528 Java 8 NIO \u8bfb\u53d6\u6587\u4ef6\uff1a<\/p>\n
Path file = Paths.get(\"file.txt\");\ntry {\n    Files.lines(file).forEach(System.out::println);\n} catch (IOException e) {\n    \/\/ \u5904\u7406 IOException\n}<\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 lambda \u7b80\u5316\u6b64\u64cd\u4f5c\uff1a<\/p>\n
Files.lines(file).forEachOrdered(unchecked(System.out::println));<\/pre>\n
\u7ed3\u8bba<\/strong><\/p>\n
\u5904\u7406\u975e\u68c0\u67e5\u6027\u5f02\u5e38\u662f Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u7684\u4e00\u9879\u91cd\u8981\u6280\u80fd\u3002\u901a\u8fc7\u7406\u89e3\u63d0\u4f9b\u7684\u6280\u672f\uff0c\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u521b\u5efa\u66f4\u5065\u58ee\u4e14\u4e0d\u6613\u51fa\u9519\u7684\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n
\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"
Java \u51fd\u6570\u5f0f\u7f16\u7a0b\u5982\u4f55\u5904\u7406\u975e\u68c0...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202925","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202925","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202925"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202925\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}