{"id":10843,"date":"2023-11-28T21:45:09","date_gmt":"2023-11-28T13:45:09","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=10843"},"modified":"2023-12-07T15:05:32","modified_gmt":"2023-12-07T07:05:32","slug":"jvm-zhong-lei-chu-shi-hua-de-qing-kuang-you-na-xie","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/jvm-zhong-lei-chu-shi-hua-de-qing-kuang-you-na-xie\/","title":{"rendered":"JVM\u4e2d\u7c7b\u521d\u59cb\u5316\u7684\u60c5\u51b5\u6709\u54ea\u4e9b\uff1f"},"content":{"rendered":"

\u5728Java\u865a\u62df\u673a\uff08JVM\uff09\u4e2d\uff0c\u7c7b\u7684\u521d\u59cb\u5316\u662f\u6307\u5bf9\u7c7b\u8fdb\u884c\u9996\u6b21\u4f7f\u7528\u524d\u7684\u51c6\u5907\u548c\u521d\u59cb\u5316\u64cd\u4f5c\u3002\u7c7b\u521d\u59cb\u5316\u662f\u4e00\u4e2a\u7c7b\u52a0\u8f7d\u9636\u6bb5\u7684\u4e00\u90e8\u5206\uff0c\u4e3b\u8981\u76ee\u7684\u662f\u4e3a\u7c7b\u53d8\u91cf\u8d4b\u521d\u503c\uff0c\u6267\u884c\u9759\u6001\u521d\u59cb\u5316\u5757\uff0c\u4ee5\u53ca\u6267\u884c\u4e00\u4e9b\u4e0e\u7c7b\u7684\u521d\u59cb\u5316\u76f8\u5173\u7684\u7279\u6b8a\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u89e6\u53d1\u7c7b\u521d\u59cb\u5316\u7684\u60c5\u51b5\uff1a<\/p>\n

    \n
  1. \n\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\uff1a<\/strong> \u5f53\u4f7f\u7528new<\/code>\u5173\u952e\u5b57\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\u65f6\uff0c\u4f1a\u89e6\u53d1\u7c7b\u7684\u521d\u59cb\u5316\u3002\u6b64\u65f6\u5c06\u6309\u7167\u7c7b\u53d8\u91cf\u7684\u58f0\u660e\u987a\u5e8f\u6267\u884c\u521d\u59cb\u5316\u3002<\/p>\n
    MyClass obj = new MyClass(); \/\/ \u89e6\u53d1MyClass\u7c7b\u7684\u521d\u59cb\u5316\n<\/code><\/pre>\n<\/li>\n
  2. \n\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u53d8\u91cf\uff08\u88abfinal\u4fee\u9970\uff0c\u7f16\u8bd1\u671f\u5e38\u91cf\u4e0d\u4f1a\u89e6\u53d1\u521d\u59cb\u5316\uff09\uff1a<\/strong> \u5f53\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u53d8\u91cf\uff08\u7c7b\u53d8\u91cf\uff09\u65f6\uff0c\u4f1a\u89e6\u53d1\u7c7b\u7684\u521d\u59cb\u5316\u3002\u88abfinal<\/code>\u4fee\u9970\u7684\u9759\u6001\u53d8\u91cf\u5982\u679c\u662f\u7f16\u8bd1\u671f\u5e38\u91cf\uff0c\u4e0d\u4f1a\u89e6\u53d1\u521d\u59cb\u5316\u3002<\/p>\n
    int value = MyClass.staticVariable; \/\/ \u89e6\u53d1MyClass\u7c7b\u7684\u521d\u59cb\u5316\n<\/code><\/pre>\n<\/li>\n
  3. \n\u8c03\u7528\u7c7b\u7684\u9759\u6001\u65b9\u6cd5\uff1a<\/strong> \u5f53\u8c03\u7528\u7c7b\u7684\u9759\u6001\u65b9\u6cd5\u65f6\uff0c\u4f1a\u89e6\u53d1\u7c7b\u7684\u521d\u59cb\u5316\u3002<\/p>\n
    MyClass.staticMethod(); \/\/ \u89e6\u53d1MyClass\u7c7b\u7684\u521d\u59cb\u5316\n<\/code><\/pre>\n<\/li>\n
  4. \n\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u5b57\u6bb5\uff08\u88abfinal\u4fee\u9970\uff0c\u7f16\u8bd1\u671f\u5e38\u91cf\u4e0d\u4f1a\u89e6\u53d1\u521d\u59cb\u5316\uff09\uff1a<\/strong> \u5f53\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u5b57\u6bb5\uff08\u9759\u6001\u53d8\u91cf\uff09\u65f6\uff0c\u4f1a\u89e6\u53d1\u7c7b\u7684\u521d\u59cb\u5316\u3002\u88abfinal<\/code>\u4fee\u9970\u7684\u9759\u6001\u5b57\u6bb5\u5982\u679c\u662f\u7f16\u8bd1\u671f\u5e38\u91cf\uff0c\u4e0d\u4f1a\u89e6\u53d1\u521d\u59cb\u5316\u3002<\/p>\n
    int value = MyClass.staticField; \/\/ \u89e6\u53d1MyClass\u7c7b\u7684\u521d\u59cb\u5316\n<\/code><\/pre>\n<\/li>\n
  5. \n\u8c03\u7528Class.forName<\/code>\u65b9\u6cd5\u52a0\u8f7d\u7c7b\uff1a<\/strong> \u901a\u8fc7Class.forName<\/code>\u65b9\u6cd5\u52a0\u8f7d\u7c7b\u65f6\uff0c\u5982\u679c\u6307\u5b9a\u53c2\u6570initialize<\/code>\u4e3atrue<\/code>\uff0c\u5219\u4f1a\u89e6\u53d1\u7c7b\u7684\u521d\u59cb\u5316\u3002<\/p>\n
    Class.forName("MyClass", true, classLoader); \/\/ \u89e6\u53d1MyClass\u7c7b\u7684\u521d\u59cb\u5316\n<\/code><\/pre>\n<\/li>\n
  6. \n\u4f7f\u7528\u53cd\u5c04\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u6216\u65b9\u6cd5\uff1a<\/strong> \u5f53\u901a\u8fc7\u53cd\u5c04\u673a\u5236\u8bbf\u95ee\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u6216\u65b9\u6cd5\u65f6\uff0c\u4f1a\u89e6\u53d1\u7c7b\u7684\u521d\u59cb\u5316\u3002<\/p>\n
    Class<?> clazz = MyClass.class;\nField field = clazz.getField("staticVariable");\nint value = (int) field.get(null); \/\/ \u89e6\u53d1MyClass\u7c7b\u7684\u521d\u59cb\u5316\n<\/code><\/pre>\n<\/li>\n<\/ol>\n
    \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u53ea\u6709\u771f\u6b63\u89e6\u53d1\u4e86\u7c7b\u521d\u59cb\u5316\u7684\u60c5\u51b5\u4e0b\uff0c\u7c7b\u7684\u521d\u59cb\u5316\u64cd\u4f5c\u624d\u4f1a\u6267\u884c\u3002\u4e00\u4e9b\u7c7b\u52a0\u8f7d\u7684\u51c6\u5907\u9636\u6bb5\u5e76\u4e0d\u4f1a\u5f15\u53d1\u521d\u59cb\u5316\uff0c\u53ea\u6709\u5728\u7c7b\u88ab\u4e3b\u52a8\u4f7f\u7528\u65f6\u624d\u4f1a\u8fdb\u884c\u521d\u59cb\u5316\u3002\u6b64\u5916\uff0c\u5bf9\u4e8e\u7f16\u8bd1\u5668\u5e38\u91cf\uff0c\u5b83\u4eec\u5728\u7f16\u8bd1\u671f\u95f4\u5c31\u4f1a\u88ab\u89e3\u6790\u4e3a\u5177\u4f53\u7684\u503c\uff0c\u56e0\u6b64\u8bbf\u95ee\u5b83\u4eec\u4e0d\u4f1a\u5f15\u53d1\u7c7b\u7684\u521d\u59cb\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5728Java\u865a\u62df\u673a\uff08JVM\uff09\u4e2d\uff0c\u7c7b\u7684\u521d\u59cb\u5316\u662f\u6307\u5bf9\u7c7b\u8fdb\u884c\u9996\u6b21\u4f7f\u7528\u524d\u7684\u51c6\u5907\u548c\u521d\u59cb\u5316\u64cd\u4f5c\u3002\u7c7b\u521d\u59cb\u5316\u662f\u4e00\u4e2a\u7c7b\u52a0\u8f7d\u9636\u6bb5\u7684\u4e00 […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[119],"tags":[],"class_list":["post-10843","post","type-post","status-publish","format-standard","hentry","category-jvm"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10843","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=10843"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10843\/revisions"}],"predecessor-version":[{"id":16905,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/10843\/revisions\/16905"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=10843"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=10843"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=10843"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}