{"id":202796,"date":"2025-05-22T09:31:37","date_gmt":"2025-05-22T01:31:37","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202796\/"},"modified":"2025-05-22T09:31:37","modified_gmt":"2025-05-22T01:31:37","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-java-%e4%b8%ad%e5%a4%84%e7%90%86%e5%a4%9a%e9%87%8d%e5%bc%82%e5%b8%b8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202796\/","title":{"rendered":"\u5982\u4f55\u5728 Java \u4e2d\u5904\u7406\u591a\u91cd\u5f02\u5e38\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5728 Java \u4e2d\u5904\u7406\u591a\u91cd\u5f02\u5e38\uff1f<\/h1>\n

\u6700\u8fd1\u53d1\u73b0\u4e0d\u5c11\u5c0f\u4f19\u4f34\u90fd\u5bf9\u6587\u7ae0<\/span>\u5f88\u611f\u5174\u8da3\uff0c\u6240\u4ee5\u4eca\u5929\u7ee7\u7eed\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\uff0c\u672c\u6587\u300a\u5982\u4f55\u5728 Java \u4e2d\u5904\u7406\u591a\u91cd\u5f02\u5e38\uff1f\u300b<\/span>\u4e3b\u8981\u5185\u5bb9\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01\u5f53\u7136\u5982\u679c\u9605\u8bfb\u672c\u6587\u65f6\u5b58\u5728\u4e0d\u540c\u60f3\u6cd5\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u4e2d\u8868\u8fbe\uff0c\u4f46\u662f\u8bf7\u52ff\u4f7f\u7528\u8fc7\u6fc0\u7684\u63aa\u8f9e~<\/p>\n

Java \u4e2d\u5904\u7406\u591a\u91cd\u5f02\u5e38\u7684\u65b9\u6cd5\uff1atry-catch-finally \u5757\uff1a \u4f7f\u7528\u5d4c\u5957\u7684 catch \u5757\u6765\u5904\u7406\u4e0d\u540c\u7c7b\u578b\u7684\u5f02\u5e38\u3002\u4f7f\u7528\u591a\u4e2a catch \u5757\uff1a \u6bcf\u4e2a catch \u5757\u9488\u5bf9\u7279\u5b9a\u5f02\u5e38\u7c7b\u578b\u3002\u5b9e\u6218\u6848\u4f8b\uff1a \u5c1d\u8bd5\u8bfb\u53d6\u6587\u4ef6\u65f6\uff0c\u5904\u7406 FileNotFoundException \u548c\u5176\u4ed6\u5f02\u5e38\u3002<\/p>\n

<\/p>\n

\u5728 Java \u4e2d\u5904\u7406\u591a\u91cd\u5f02\u5e38<\/strong><\/p>\n

\u5728\u73b0\u5b9e\u4e16\u754c\u7684\u7f16\u7a0b\u4e2d\uff0c\u5e94\u7528\u7a0b\u5e8f\u53ef\u80fd\u4f1a\u540c\u65f6\u9047\u5230\u591a\u4e2a\u5f02\u5e38\u3002\u5904\u7406\u591a\u91cd\u5f02\u5e38\u81f3\u5173\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u9632\u6b62\u7a0b\u5e8f\u610f\u5916\u7ec8\u6b62\u5e76\u63d0\u4f9b\u66f4\u597d\u7684\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n

try-catch-finally \u5757<\/strong><\/p>\n

try-catch-finally \u5757\u662f\u5904\u7406\u591a\u91cd\u5f02\u5e38\u7684\u6700\u5e38\u89c1\u65b9\u6cd5\u3002\u5b83\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

try {\n    \/\/ \u53ef\u80fd\u629b\u51fa\u5f02\u5e38\u7684\u4ee3\u7801\n} catch (Exception1 e1) {\n    \/\/ \u5904\u7406 Exception1\n} catch (Exception2 e2) {\n    \/\/ \u5904\u7406 Exception2\n} finally {\n    \/\/ \u65e0\u8bba\u662f\u5426\u53d1\u751f\u5f02\u5e38\uff0c\u90fd\u4f1a\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
\u4f7f\u7528\u591a\u4e2a catch \u5757<\/strong><\/p>\n
\u6bcf\u4e2a catch \u5757\u7528\u4e8e\u5904\u7406\u7279\u5b9a\u7c7b\u578b\u7684\u5f02\u5e38\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u5904\u7406 ArithmeticException \u548c NullPointerException\uff1a<\/p>\n
try {\n    int x = 10 \/ 0;  \/\/ \u629b\u51fa ArithmeticException\n    Object y = null;\n    y.toString();    \/\/ \u629b\u51fa NullPointerException\n} catch (ArithmeticException e) {\n    System.out.println(\"\u9664\u6570\u4e0d\u80fd\u4e3a\u96f6\");\n} catch (NullPointerException e) {\n    System.out.println(\"\u5bf9\u8c61\u4e0d\u80fd\u4e3a\u7a7a\");\n}<\/pre>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5904\u7406\u591a\u91cd\u5f02\u5e38\u7684\u5b9e\u6218\u6848\u4f8b\uff1a<\/p>\n
import java.io.File;\nimport java.io.FileNotFoundException;\nimport java.util.Scanner;\n\npublic class FileReadingExample {\n\n    public static void main(String[] args) {\n        try {\n            File file = new File(\"input.txt\");\n            Scanner scanner = new Scanner(file);\n            while (scanner.hasNext()) {\n                System.out.println(scanner.nextLine());\n            }\n            scanner.close();\n        } catch (FileNotFoundException e) {\n            System.out.println(\"\u6587\u4ef6\u4e0d\u5b58\u5728\");\n        } catch (Exception e) {\n            System.out.println(\"\u8bfb\u53d6\u6587\u4ef6\u65f6\u51fa\u9519\uff1a\" + e.getMessage());\n        }\n    }\n}<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4ee3\u7801\u53ef\u80fd\u4f1a\u629b\u51fa\u4e24\u4e2a\u5f02\u5e38\uff1aFileNotFoundException \u548c\u5176\u4ed6\u4e00\u822c\u5f02\u5e38\u3002\u8be5\u4ee3\u7801\u4f7f\u7528 try-catch-finally \u5757\u6765\u5904\u7406\u8fd9\u4e24\u4e2a\u5f02\u5e38\uff0c\u5e76\u5728\u53d1\u751f\u5f02\u5e38\u65f6\u63d0\u4f9b\u6709\u610f\u4e49\u7684\u9519\u8bef\u6d88\u606f\u3002<\/p>\n
\u672c\u7bc7\u5173\u4e8e\u300a\u5982\u4f55\u5728 Java \u4e2d\u5904\u7406\u591a\u91cd\u5f02\u5e38\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u5728 Java \u4e2d\u5904\u7406\u591a\u91cd\u5f02\u5e38...<\/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-202796","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202796","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=202796"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202796\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}