{"id":142,"date":"2016-09-09T14:49:28","date_gmt":"2016-09-09T06:49:28","guid":{"rendered":"http:\/\/jason19659.pw\/?p=142"},"modified":"2016-09-09T14:49:28","modified_gmt":"2016-09-09T06:49:28","slug":"%e7%bb%a7%e7%bb%ad%e8%bd%ac%e4%bb%a5%e5%89%8d%e7%9a%84java%e7%9a%84%e6%96%87%e7%ab%a0","status":"publish","type":"post","link":"https:\/\/t2t2.cc\/?p=142","title":{"rendered":"\u7ee7\u7eed\u8f6c\u4ee5\u524d\u7684java\u7684\u6587\u7ae0"},"content":{"rendered":"

\u4f5c\u8005\uff1ajason christ
\n\u94fe\u63a5\uff1ahttps:\/\/www.zhihu.com\/question\/37760140\/answer\/74523291
\n\u6765\u6e90\uff1a\u77e5\u4e4e
\n\u8457\u4f5c\u6743\u5f52\u4f5c\u8005\u6240\u6709\uff0c\u8f6c\u8f7d\u8bf7\u8054\u7cfb\u4f5c\u8005\u83b7\u5f97\u6388\u6743\u3002<\/p>\n

\u60f3\u8d77\u4e861+1=3\u7684\u90a3\u4e2a
\n\u4ee3\u7801\u5927\u6982\u662f\u8fd9\u4e2a\u6837\u5b50…
\n—————————————-<\/p>\n

\r\npublic static void main(String[] args) throws Exception {\r\n\t\tClass integer = Integer.class.getDeclaredClasses()[0];\r\n\t\tField field = integer.getDeclaredField("cache");\r\n\t\tfield.setAccessible(true);\r\n\t\tInteger[] array =  (Integer[]) field.get(integer);\r\n\t\tarray[130] = array[131];\r\n\t\tSystem.out.printf("%d", 1 + 1);\r\n}\r\n<\/pre>\n
———————————————————————————————-
\n\u89e3\u89e3\u91ca\u4e00\u4e0b,\u524d\u9762\u51e0\u6b65\u662f\u53cd\u5c04\u5c31\u4e0d\u8bf4\u4e86,java\u91cc\u9762\u6709\u4e00\u4e2aint\u5e38\u91cf\u6c60,\u4e5f\u5c31\u662ffield.get(integer);\u8fd9\u53e5\u4ee3\u7801\u6240\u62ff\u5230\u7684,\u5b83\u7684\u957f\u5ea6\u662f256,\u91cc\u9762\u5b58\u7740[-128-127]\u4e4b\u95f4\u7684\u6570\u5b57.\u8fd9\u4e2a\u6709\u4ec0\u4e48\u7528?\u770b\u4e86\u4e0b\u9762\u7684\u4ee3\u7801\u4f60\u5c31\u4f1a\u7406\u89e3\u4e86<\/p>\n
\r\n                Integer a = -128;\r\n\t\tInteger b = -128;\r\n\t\tInteger c = -129;\r\n\t\tInteger d = -129;\r\n\t\tSystem.out.println(a == b);\r\n\/\/true\r\n\t\tSystem.out.println(c == d);\/\/false\r\n<\/pre>\n
\u7136\u540e,System.out.printf\u8fd9\u4e2a\u65b9\u6cd5\u5e76\u6ca1\u6709\u505a\u9a8c\u8bc1,\u800c\u662f\u5982\u679c\u503c\u5728\u8fd9\u4e2a\u8303\u56f4\u5c31\u76f4\u63a5\u4ece\u6c60\u4e2d\u62ff\u51fa\u6765.
\n\u4e5f\u5c31\u662f\u8bf4,\u5982\u679c\u6211\u8fd9\u6837\u5199<\/p>\n
\r\n                for (int i = 0; i < array.length; i++) {\r\n\t\t\tarray[i] = 12450;\r\n\t\t}\r\n\t\tfor (int i = -128; i <= 127; i++) {\r\n\t\t\tSystem.out.printf("%d\\n", i);\r\n\t\t}\r\n<\/pre>\n
\u8f93\u51fa\u7684\u5c06\u90fd\u4f1a\u662f12450.
\nprintln\u5c31\u4e0d\u4f1a\u7528\u8fd9\u4e2a\u95ee\u9898,\u56e0\u4e3a\u5b83\u7528\u7684\u662fString.valueOf(i).<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4f5c\u8005\uff1ajason christ \u94fe\u63a5\uff1ahttps:\/\/www.zhihu.com\/question\/37760… Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/t2t2.cc\/index.php?rest_route=\/wp\/v2\/posts\/142"}],"collection":[{"href":"https:\/\/t2t2.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/t2t2.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/t2t2.cc\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/t2t2.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=142"}],"version-history":[{"count":1,"href":"https:\/\/t2t2.cc\/index.php?rest_route=\/wp\/v2\/posts\/142\/revisions"}],"predecessor-version":[{"id":143,"href":"https:\/\/t2t2.cc\/index.php?rest_route=\/wp\/v2\/posts\/142\/revisions\/143"}],"wp:attachment":[{"href":"https:\/\/t2t2.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=142"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/t2t2.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=142"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/t2t2.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}