{"id":566,"date":"2022-07-16T09:44:46","date_gmt":"2022-07-16T01:44:46","guid":{"rendered":"http:\/\/blog.nonot.cn\/?p=566"},"modified":"2024-07-08T12:47:26","modified_gmt":"2024-07-08T04:47:26","slug":"java-finally-%e7%9a%84%e7%94%a8%e6%b3%95%ef%bc%8c%e7%9c%8b%e8%bf%99%e4%b8%80%e7%af%87%e5%b0%b1%e5%a4%9f%e4%ba%86","status":"publish","type":"post","link":"https:\/\/blog.nonot.cn\/index.php\/2022\/07\/16\/java-finally-%e7%9a%84%e7%94%a8%e6%b3%95%ef%bc%8c%e7%9c%8b%e8%bf%99%e4%b8%80%e7%af%87%e5%b0%b1%e5%a4%9f%e4%ba%86\/","title":{"rendered":"Java finally \u7684\u7528\u6cd5\uff0c\u770b\u8fd9\u4e00\u7bc7\u5c31\u591f\u4e86"},"content":{"rendered":"

1.\u6982\u8ff0<\/h1>\n

\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u7814\u7a76 Java \u4e2d\u7684 finally \u5173\u952e\u5b57\u7684\u7528\u6cd5\u3002 \u6211\u4eec\u5c06\u770b\u5230\u5982\u4f55\u5728\u9519\u8bef\u5904\u7406\u4e2d\u4e0e try \/ catch \u5757\u4e00\u8d77\u4f7f\u7528\u5b83\u3002 \u5c3d\u7ba1 finally \u7684\u76ee\u7684\u662f\u4fdd\u8bc1\u4ee3\u7801\u88ab\u6267\u884c\uff0c\u4f46\u662f\u6211\u4eec\u8fd8\u5c06\u8ba8\u8bba\u00a0JVM<\/a>\u00a0\u4e0d\u6267\u884c finally \u4ee3\u7801\u7684\u7279\u6b8a\u60c5\u51b5\u3002<\/p>\n

\u6211\u4eec\u8fd8\u5c06\u8ba8\u8bba\u4e00\u4e9b\u5e38\u89c1\u7684\u9677\u9631\uff0c\u5728\u8fd9\u4e9b\u9677\u9631\u4e2d\uff0cfinally \u5757\u53ef\u80fd\u4f1a\u4ea7\u751f\u610f\u5916\u7684\u7ed3\u679c\u3002<\/p>\n

<\/a><\/a>2.\u4ec0\u4e48\u662ffinally<\/h1>\n

try \u5173\u952e\u5b57\u6700\u540e\u53ef\u4ee5\u5b9a\u4e49 finally \u4ee3\u7801\u5757\u3002 finally \u5757\u4e2d\u5b9a\u4e49\u7684\u4ee3\u7801\uff0c\u603b\u662f\u5728 try \u548c\u4efb\u4f55 catch \u5757\u4e4b\u540e\u3001\u65b9\u6cd5\u5b8c\u6210\u4e4b\u524d\u8fd0\u884c\u3002<\/p>\n

\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u4e0d\u7ba1\u662f\u5426\u629b\u51fa\u6216\u6355\u83b7\u5f02\u5e38 finally \u5757\u90fd\u4f1a\u6267\u884c\u3002<\/p>\n

<\/a><\/a>2.1. \u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50<\/h2>\n
try {\n    System.out.println(\"The count is \" + Integer.parseInt(count));\n} catch (NumberFormatException e) {\n    System.out.println(\"No count\");\n} finally {\n    System.out.println(\"In finally\");\n}\n<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u4e0d\u7ba1\u53c2\u6570\u7684\u503c\u662f\u591a\u5c11\uff0cJVM \u90fd\u6267\u884c finally \u5757\u5e76\u8f93\u51fa\u201c In finally\u201d\u3002<\/p>\n
<\/a><\/a>2.2 \u4e0d\u5e26 catch \u4ee3\u7801\u5757\u7684 finally<\/h2>\n
try {\n    System.out.println(\"Inside try\");\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
\u7ed3\u679c<\/p>\n
Inside\u00a0try Inside<\/code>finally<\/p><\/blockquote>\n
<\/a><\/a>2.3 finally \u7684\u4f7f\u7528\u573a\u666f<\/h2>\n
\u56e0\u4e3a\u4e0d\u7ba1\u662f\u5426\u53d1\u751f\u5f02\u5e38 finally \u90fd\u4f1a\u6267\u884c\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u5728 finally \u4ee3\u7801\u5757\u4e2d\u6267\u884c\u5173\u95ed\u8fde\u63a5\u3001\u5173\u95ed\u6587\u4ef6\u548c\u91ca\u653e\u7ebf\u7a0b\u7684\u7684\u64cd\u4f5c\u3002<\/p>\n
<\/a><\/a>3. finally \u7684\u6267\u884c\u65f6\u673a<\/h1>\n
<\/a><\/a>3.1 \u6ca1\u5f02\u5e38<\/h2>\n
\u5f53 try \u4ee3\u7801\u5757\u6267\u884c\u5b8c\u6210\uff0c finally \u4ee3\u7801\u5757\u5c31\u53ef\u4ee5\u6267\u884c\uff0c\u54ea\u6015\u6ca1\u6709\u53d1\u751f\u5f02\u5e38\u3002<\/p>\n
try {\n    System.out.println(\"Inside try\");\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
Inside try
\nInside finally<\/p><\/blockquote>\n
<\/a><\/a>3.2 \u6709\u5f02\u5e38\u4f46\u662f\u6ca1\u5904\u7406\u5668<\/h2>\n
\u54ea\u6015 \u5f02\u5e38\u6ca1\u6709\u88ab catch \uff0c finally \u4ee3\u7801\u5757\u4f9d\u7136\u4f1a\u6267\u884c\u3002<\/p>\n
try {\n    System.out.println(\"Inside try\");\n    throw new Exception();\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
\u5373\u4f7f\u51fa\u73b0\u672a\u88ab\u5904\u7406\u7684\u5f02\u5e38\uff0cJVM \u4f9d\u7136\u4f1a\u6267\u884c finally \u4ee3\u7801\u5757\u7684\u4ee3\u7801\u3002<\/p>\n
Inside try
\nInside finally
\nException in thread \u201cmain\u201d java.lang.Exception<\/p><\/blockquote>\n
<\/a><\/a>3.3 \u6709\u5f02\u5e38\u5904\u7406\u5668<\/h2>\n
try \u4ee3\u7801\u5757\u53d1\u751f\u5f02\u5e38\uff0c \u88ab catch \u6355\u6349\uff0c finally \u4f9d\u7136\u4f1a\u6267\u884c\u3002<\/p>\n
try {\n    System.out.println(\"Inside try\");\n    throw new Exception();\n} catch (Exception e) {\n    System.out.println(\"Inside catch\");\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
Inside try
\nInside catch
\nInside finally<\/p><\/blockquote>\n
<\/a><\/a>3.4 try \u4ee3\u7801\u5757\u4e2d\u5e26\u8fd4\u56de\u503c<\/h2>\n
\u5373\u4f7f try \u4ee3\u7801\u5757\u4e2d\u8fd4\u56de\uff0c\u4e5f\u4e0d\u80fd\u963b\u6b62 finally \u4ee3\u7801\u5757\u7684\u6267\u884c\u3002<\/p>\n
try {\n    System.out.println(\"Inside try\");\n    return \"from try\";\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
JVM \u4f1a\u5728\u8fd4\u56de\u5230\u8c03\u7528\u51fd\u6570\u524d\u6267\u884c finally \u4ee3\u7801\u5757\u3002<\/p>\n
Inside try
\nInside finally<\/p><\/blockquote>\n
<\/a><\/a>3.5 \u5728 catch \u4ee3\u7801\u5757\u4e2d\u8fd4\u56de<\/h2>\n
\u5728 catch \u4ee3\u7801\u5757\u4e2d\u6dfb\u52a0\u8fd4\u56de\u8bed\u53e5\uff0cfinally \u4ee3\u7801\u4f9d\u7136\u4f1a\u6267\u884c\u3002<\/p>\n
try {\n    System.out.println(\"Inside try\");\n    throw new Exception();\n} catch (Exception e) {\n    System.out.println(\"Inside catch\");\n    return \"from catch\";\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
\u7ed3\u679c<\/p>\n
Inside try
\nInside catch
\nInside finally<\/p><\/blockquote>\n
<\/a><\/a>4 \u5565\u65f6\u5019 finally \u4e0d\u4f1a\u88ab\u6267\u884c<\/h1>\n
\u5c3d\u7ba1\u901a\u5e38\u7f16\u5199 finally \u4ee3\u7801\u5757\u662f\u4e3a\u4e86\u8fd9\u6bb5\u4ee3\u7801\u4e00\u5b9a\u88ab\u6267\u884c\u5230\uff0c\u4f46\u662f\u4e5f\u6709\u4e00\u4e9b\u7279\u6b8a\u60c5\u51b5\u4f1a\u5bfc\u81f4 JVM \u4e0d\u4f1a\u6267\u884c finally \u4ee3\u7801\u5757\u3002<\/p>\n
\u5982\u679c\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u65ad\u4e86\u6211\u4eec\u7684\u7a0b\u5e8f\uff0c\u90a3\u4e48finally \u4ee3\u7801\u5757\u53ef\u80fd\u5c31\u4e0d\u80fd\u88ab\u6267\u884c\u3002\u4e5f\u6709\u5f88\u591a\u5176\u4ed6\u7c7b\u4f3c\u7684\u884c\u4e3a\u5bfc\u81f4 finally\u4ee3\u7801\u5757\u4e0d\u88ab\u6267\u884c\u3002<\/p>\n
<\/a><\/a>4.1 \u8c03\u7528 System.exit \u51fd\u6570<\/h2>\n
try {\n    System.out.println(\"Inside try\");\n    System.exit(1);\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
\u7ed3\u679c<\/p>\n
Inside try<\/p><\/blockquote>\n
<\/a><\/a>4.2 \u8c03\u7528 halt \u51fd\u6570<\/h2>\n
try {\n    System.out.println(\"Inside try\");\n    Runtime.getRuntime().halt(1);\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
Inside try<\/p><\/blockquote>\n
<\/a><\/a>4.3 \u5b88\u62a4\u7ebf\u7a0b<\/h2>\n
\u5982\u679c\u5b88\u62a4\u7ebf\u7a0b\u521a\u5f00\u59cb\u6267\u884c\u5230 finally \u4ee3\u7801\u5757\uff0c\u6b64\u65f6\u6ca1\u6709\u4efb\u4f55\u5176\u4ed6\u975e\u5b88\u62a4\u7ebf\u7a0b\uff0c\u90a3\u4e48\u865a\u62df\u673a\u5c06\u9000\u51fa\uff0c\u6b64\u65f6 JVM \u4e0d\u4f1a\u7b49\u5f85\u5b88\u62a4\u7ebf\u7a0b\u7684 finally \u4ee3\u7801\u5757\u6267\u884c\u5b8c\u6210\u3002<\/p>\n
Runnable runnable = () -> {\n    try {\n        System.out.println(\"Inside try\");\n    } finally {\n        try {\n            Thread.sleep(1000);\n            System.out.println(\"Inside finally\");\n        } catch (InterruptedException e) {\n            e.printStackTrace();\n        }\n    }\n};\nThread regular = new Thread(runnable);\nThread daemon = new Thread(runnable);\ndaemon.setDaemon(true);\nregular.start();\nThread.sleep(300);\ndaemon.start();\n<\/code><\/pre>\n
\u8f93\u51fa<\/p>\n
Inside try
\nInside try
\nInside finally<\/p><\/blockquote>\n
<\/a><\/a>4.4 try \u4ee3\u7801\u5757\u4e2d\u65e0\u9650\u5faa\u73af<\/h2>\n
try {\n    System.out.println(\"Inside try\");\n    while (true) {\n    }\n} finally {\n    System.out.println(\"Inside finally\");\n}\n<\/code><\/pre>\n
Try \u4ee3\u7801\u5757\u51fa\u73b0\u65e0\u9650\u5faa\u73af\uff0c\u4e14\u4e0d\u51fa\u73b0\u5f02\u5e38\uff0cfinally \u4e5f\u5c06\u6c38\u8fdc\u5f97\u4e0d\u5230\u6267\u884c\u3002<\/p>\n
<\/a><\/a>5. \u5e38\u89c1\u9677\u9631<\/h1>\n
\u6211\u4eec\u5728\u4f7f\u7528 finally \u5173\u952e\u5b57\u65f6\u4f1a\u9047\u5230\u5f88\u591a\u9677\u9631\u3002<\/p>\n
\u6709\u4e00\u4e9b\u4e0d\u597d\u7684\u7f16\u7801\u65b9\u5f0f\uff0c\u5982\u5728 finally \u4ee3\u7801\u5757\u4e2d\u5b58\u5728\u8fd4\u56de\u503c\u6216\u8005\u6254\u51fa\u5f02\u5e38\u3002<\/p>\n
<\/a><\/a>5.1 \u5ffd\u89c6\u5f02\u5e38<\/h2>\n
finally \u4ee3\u7801\u5757\u5305\u542b\u8fd4\u56de\u8bed\u53e5\uff0c\u6ca1\u6709\u5904\u7406\u672a\u6355\u83b7\u7684\u5f02\u5e38\u3002<\/p>\n
try {\n    System.out.println(\"Inside try\");\n    throw new RuntimeException();\n} finally {\n    System.out.println(\"Inside finally\");\n    return \"from finally\";\n}\n<\/code><\/pre>\n
\u6b64\u65f6\uff0ctry \u4ee3\u7801\u5757\u4e2d\u7684 RuntimeException \u4f1a\u88ab\u5ffd\u7565\uff0c\u51fd\u6570\u8fd4\u56de “from finally”\u5b57\u7b26\u4e32\u3002<\/p>\n
<\/a><\/a>5.2 \u8986\u76d6\u5176\u4ed6\u8fd4\u56de\u8bed\u53e5<\/h2>\n
\u5982\u679c finally \u4ee3\u7801\u5757\u4e2d\u5b58\u5728\u8fd4\u56de\u8bed\u53e5\uff0c\u5219 try \u548c catch \u4ee3\u7801\u5757\u5982\u679c\u5b58\u5728\u8fd4\u56de\u8bed\u53e5\u5c31\u4f1a\u88ab\u5ffd\u7565\u3002<\/p>\n
try {\n    System.out.println(\"Inside try\");\n    return \"from try\";\n} finally {\n    System.out.println(\"Inside finally\");\n    return \"from finally\";\n}\n<\/code><\/pre>\n
\u6b64\u6bb5\u4ee3\u7801\u603b\u662f\u8fd4\u56de \u201cfrom finally\u201d \u3002<\/p>\n
<\/a><\/a>5.3 \u6539\u53d8 throw \u6216 return \u884c\u4e3a<\/h2>\n
\u5982\u679c\u518d finally \u4ee3\u7801\u5757\u4e2d\u6254\u51fa\u5f02\u5e38\uff0c\u5219 try \u548c catch \u4e2d\u7684\u5f02\u5e38\u6254\u51fa\u6216\u8005\u8fd4\u56de\u8bed\u53e5\u90fd\u5c06\u88ab\u5ffd\u7565\u3002<\/p>\n
try {\n    System.out.println(\"Inside try\");\n    return \"from try\";\n} finally {\n    throw new RuntimeException();\n}\n<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u6c38\u8fdc\u90fd\u4e0d\u4f1a\u6709\u8fd4\u56de\u503c\uff0c\u603b\u662f\u4f1a\u629b\u51fa RuntimeException\u3002<\/p>\n
<\/a><\/a>6. \u7ed3\u8bba<\/h1>\n
\u672c\u6587\u6211\u4eec\u8ba8\u8bba\u4e86 Java \u7684 finally \u5173\u952e\u5b57\u7684\u7528\u6cd5\u3002\u7136\u540e\u8ba8\u8bba\u4e86 finally \u6267\u884c\u548c\u4e0d\u6267\u884c finally \u4ee3\u7801\u5757\u7684\u60c5\u51b5\u3002<\/p>\n
\u6700\u540e\u7ed9\u51fa\u4e86\u5f00\u53d1\u4e2d\u5173\u4e8e finally \u5e38\u89c1\u7684\u4f7f\u7528\u7684\u9677\u9631\u3002<\/p>\n
\u9700\u8981\u672c\u6587\u4ee3\u7801\uff0c\u53ef\u4ee5\u53bbGitHub\u00a0\u914d\u5957 \u9879\u76ee<\/a>\u4e2d\u4e0b\u8f7d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
1.\u6982\u8ff0 \u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u7814\u7a76 Java \u4e2d\u7684 final…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-566","post","type-post","status-publish","format-standard","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/comments?post=566"}],"version-history":[{"count":1,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/566\/revisions"}],"predecessor-version":[{"id":1189,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/566\/revisions\/1189"}],"wp:attachment":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/media?parent=566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/categories?post=566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/tags?post=566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}