{"id":202631,"date":"2025-05-22T10:41:21","date_gmt":"2025-05-22T02:41:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202631\/"},"modified":"2025-05-22T10:41:21","modified_gmt":"2025-05-22T02:41:21","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-java-%e4%b8%ad%e7%9a%84-lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e5%a4%84%e7%90%86%e5%bc%82%e5%b8%b8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202631\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 Java \u4e2d\u7684 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u4f7f\u7528 Java \u4e2d\u7684 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff1f<\/h1>\n

\u6709\u5fd7\u8005\uff0c\u4e8b\u7adf\u6210\uff01\u5982\u679c\u4f60\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\uff0c\u90a3\u4e48\u672c\u6587\u300a\u5982\u4f55\u4f7f\u7528 Java \u4e2d\u7684 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff1f\u300b<\/span>\uff0c\u5c31\u5f88\u9002\u5408\u4f60\uff01\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec<\/span>\uff0c\u82e5\u662f\u4f60\u5bf9\u672c\u6587\u611f\u5174\u8da3\uff0c\u6216\u8005\u662f\u60f3\u641e\u61c2\u5176\u4e2d\u67d0\u4e2a\u77e5\u8bc6\u70b9\uff0c\u5c31\u8bf7\u4f60\u7ee7\u7eed\u5f80\u4e0b\u770b\u5427~<\/span><\/p>\n

\u5904\u7406 Lambda \u8868\u8fbe\u5f0f\u4e2d\u7684\u5f02\u5e38\u6709\u4e09\u79cd\u65b9\u6cd5\uff1a1. \u4f7f\u7528 try-catch \u5757\uff1b2. \u4f7f\u7528\u5f02\u5e38\u5904\u7406\u51fd\u6570\uff1b3. \u4f7f\u7528\u89c4\u907f\u68c0\u67e5\u5f02\u5e38\u3002<\/p>\n

<\/p>\n

\u5982\u4f55\u4f7f\u7528 Java \u4e2d\u7684 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u5141\u8bb8\u6211\u4eec\u5728 Java \u4e2d\u4ee5\u7b80\u4fbf\u7684\u65b9\u5f0f\u4f20\u9012\u884c\u4e3a\uff0c\u4f46\u5728\u5904\u7406\u5f02\u5e38\u65f6\u53ef\u80fd\u4f1a\u5e26\u6765\u6311\u6218\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff0c\u5e76\u63d0\u4f9b\u5b9e\u6218\u6848\u4f8b\u4f9b\u60a8\u53c2\u8003\u3002<\/p>\n

1. \u4f7f\u7528 try-catch \u5757<\/strong><\/p>\n

\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u5c06 Lambda \u8868\u8fbe\u5f0f\u5305\u88c5\u5728 try-catch \u5757\u4e2d\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

try {\n    \/\/ Lambda \u8868\u8fbe\u5f0f\n} catch (Exception e) {\n    \/\/ \u5f02\u5e38\u5904\u7406\u4ee3\u7801\n}<\/pre>\n
2. \u4f7f\u7528\u5f02\u5e38\u5904\u7406\u51fd\u6570<\/strong><\/p>\n
Java 8 \u5f15\u5165\u4e86 java.util.function.BiConsumer<\/code> \u63a5\u53e3\uff0c\u5176 accept<\/code> \u65b9\u6cd5\u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff1a\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u8f93\u5165\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a\u5f02\u5e38\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u63a5\u53e3\u6765\u5904\u7406 Lambda \u8868\u8fbe\u5f0f\u4e2d\u629b\u51fa\u7684\u5f02\u5e38\uff1a<\/p>\n
BiConsumer<String, Exception> handler = (input, e) -> {\n    \/\/ \u5f02\u5e38\u5904\u7406\u4ee3\u7801\n};<\/pre>\n
\u7136\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528 andThen<\/code> \u65b9\u6cd5\u5c06\u5f02\u5e38\u5904\u7406\u51fd\u6570\u9644\u52a0\u5230 Lambda \u8868\u8fbe\u5f0f\uff1a<\/p>\n
Consumer<String> consumer = input -> {\n    \/\/ Lambda \u8868\u8fbe\u5f0f\n}.andThen(handler);<\/pre>\n
3. \u4f7f\u7528\u89c4\u907f\u68c0\u67e5\u5f02\u5e38<\/strong><\/p>\n
\u5982\u679c Lambda \u8868\u8fbe\u5f0f\u629b\u51fa\u7684\u5f02\u5e38\u662f\u68c0\u67e5\u5f02\u5e38\uff0c\u53ef\u4ee5\u4f7f\u7528\u89c4\u907f\u68c0\u67e5\u5f02\u5e38\u6765\u907f\u514d\u7f16\u8bd1\u5668\u9519\u8bef\u3002\u89c4\u907f\u68c0\u67e5\u5f02\u5e38\u662f\u4e00\u79cd\u5c06\u68c0\u67e5\u5f02\u5e38 \u5305\u88c5\u5728RuntimeException \u4e2d\u7684\u6280\u672f\u3002<\/p>\n
Consumer<String> consumer = input -> {\n    try {\n        \/\/ Lambda \u8868\u8fbe\u5f0f\n    } catch (Exception e) {\n        throw new RuntimeException(e);\n    }\n};<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u8003\u8651\u4ee5\u4e0b\u793a\u4f8b\uff0c\u5176\u4e2d\u6211\u4eec\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u89e3\u6790\u6574\u6570\uff1a<\/p>\n
List<String> inputs = Arrays.asList(\"123\", \"abc\", \"456\");\nList<Integer> numbers = new ArrayList<>();\n\ninputs.forEach(input -> {\n    try {\n        numbers.add(Integer.parseInt(input));\n    } catch (NumberFormatException e) {\n        System.out.println(\"\u65e0\u6cd5\u89e3\u6790\u8f93\u5165\uff1a\" + input);\n    }\n});<\/pre>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86 try-catch \u5757\u6765\u5904\u7406 NumberFormatException<\/code>\uff0c\u8fd9\u79cd\u5f02\u5e38\u53ef\u80fd\u7531 Integer.parseInt<\/code> \u65b9\u6cd5\u629b\u51fa\u3002<\/p>\n
\u6587\u4e2d\u5173\u4e8ejava,\u5f02\u5e38\u5904\u7406\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u5982\u4f55\u4f7f\u7528 Java \u4e2d\u7684 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u4f7f\u7528 Java \u4e2d\u7684 Lam...<\/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-202631","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202631","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=202631"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202631\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202631"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202631"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202631"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}