{"id":202709,"date":"2025-05-22T10:38:14","date_gmt":"2025-05-22T02:38:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202709\/"},"modified":"2025-05-22T10:38:14","modified_gmt":"2025-05-22T02:38:14","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-java-%e4%b8%ad%e4%bd%bf%e7%94%a8-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\/202709\/","title":{"rendered":"\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff1f<\/h1>\n

\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff1f\u300b\uff0c\u8986\u76d6\u4e86\u6587\u7ae0\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n

\u7b54\u6848\uff1a\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff0c\u53ef\u4ee5\u7b80\u5316\u5f02\u5e38\u5904\u7406\u4ee3\u7801\uff0c\u6709\u4e24\u79cd\u4e3b\u8981\u65b9\u6cd5\uff1a\u901a\u8fc7 catch \u5b50\u53e5\u548c lambda try\u3002\u901a\u8fc7 catch \u5b50\u53e5\uff1a\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\uff0c\u5c06\u5f02\u5e38\u4fe1\u606f\u6253\u5370\u5230\u63a7\u5236\u53f0\u3002\u901a\u8fc7 lambda try\uff1a\u76f4\u63a5\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u6307\u5b9a\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\uff0c\u5728 Java 10 \u53ca\u4ee5\u4e0a\u7248\u672c\u53ef\u7528\u3002<\/p>\n

<\/p>\n

\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u662f Java 8 \u4e2d\u5f15\u5165\u7684\u7b80\u6d01\u4e14\u5b9e\u7528\u7684\u7279\u6027\u3002\u5b83\u4eec\u5141\u8bb8\u5c06\u533f\u540d\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u65b9\u6cd5\u3002\u8fd9\u79cd\u529f\u80fd\u5bf9\u4e8e\u5904\u7406\u5f02\u5e38\u5341\u5206\u6709\u7528\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u7b80\u5316\u5f02\u5e38\u5904\u7406\u4ee3\u7801\u3002<\/p>\n

\u8bed\u6cd5<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u7684\u57fa\u672c\u8bed\u6cd5\u4e3a\uff1a<\/p>\n

(\u53c2\u6570\u5217\u8868) -> \u8868\u8fbe\u5f0f<\/pre>\n
\u5176\u4e2d\uff1a<\/p>\n
    \n
  • \u53c2\u6570\u5217\u8868\uff1a<\/strong>\u4e0e\u666e\u901a\u65b9\u6cd5\u7684\u53c2\u6570\u5217\u8868\u7c7b\u4f3c\u3002<\/li>\n
  • \u8868\u8fbe\u5f0f\uff1a<\/strong>\u8981\u6267\u884c\u7684\u4ee3\u7801\u3002<\/li>\n<\/ul>\n
    \u5904\u7406\u5f02\u5e38\u7684 Lambda \u8868\u8fbe\u5f0f<\/strong><\/p>\n
    \u5728 Java \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a<\/p>\n
    1. \u901a\u8fc7 catch \u5b50\u53e5<\/strong><\/p>\n
    catch \u5b50\u53e5\u53ef\u4ee5\u5c06 Lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\uff1a<\/p>\n
    try {\n    \/\/ \u4ee3\u7801\u53ef\u80fd\u5f15\u53d1\u5f02\u5e38\n} catch (Exception e) {\n    \/\/ Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\n    e -> System.out.println(e.getMessage());\n}<\/pre>\n
    2. \u901a\u8fc7 lambda try<\/strong><\/p>\n
    Java 10 \u5f15\u5165\u4e86 lambda try\uff0c\u5b83\u5141\u8bb8\u60a8\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u76f4\u63a5\u6307\u5b9a\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\uff1a<\/p>\n
    try {\n    \/\/ \u4ee3\u7801\u53ef\u80fd\u5f15\u53d1\u5f02\u5e38\n} catch (Exception e) -> {\n    \/\/ Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\n    System.out.println(e.getMessage());\n}<\/pre>\n
    \u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
    \u5047\u8bbe\u60a8\u6709\u4e00\u4e2a\u5305\u542b\u53ef\u80fd\u5f15\u53d1 IOException<\/code> \u7684\u4ee3\u7801\u7684\u65b9\u6cd5\uff1a<\/p>\n
    private void readFile(String filePath) throws IOException {\n    \/\/ \u4ee3\u7801\u53ef\u80fd\u5f15\u53d1 IOException\n}<\/pre>\n
    \u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38<\/strong><\/p>\n
    \u53ef\u4ee5\u901a\u8fc7 Lambda \u8868\u8fbe\u5f0f\u4ee5\u7b80\u6d01\u65b9\u5f0f\u5904\u7406\u6b64\u5f02\u5e38\uff1a<\/p>\n
    try {\n    readFile(\"file.txt\");\n} catch (Exception e) {\n    \/\/ \u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\n    (e) -> System.out.println(\"Error occurred: \" + e.getMessage());\n}<\/pre>\n
    \u4f7f\u7528 lambda try \u5904\u7406\u5f02\u5e38<\/strong><\/p>\n
    \u5bf9\u4e8e Java 10 \u53ca\u66f4\u9ad8\u7248\u672c\uff0c\u4f7f\u7528 lambda try \u5904\u7406\u5f02\u5e38\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    try {\n    readFile(\"file.txt\");\n} catch (Exception e) -> {\n    \/\/ Lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\n    System.out.println(\"Error occurred: \" + e.getMessage());\n};<\/pre>\n
    \u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u5904\u7406\u5f02\u5e38\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u5f02\u5e38\u5904\u7406,lambda\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5982\u4f55\u5728 Java \u4e2d\u4f7f\u7528 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-202709","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202709","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=202709"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202709\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202709"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202709"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}