{"id":258,"date":"2017-01-11T14:17:54","date_gmt":"2017-01-11T06:17:54","guid":{"rendered":"http:\/\/www.prayerlaputa.com\/?p=258"},"modified":"2017-01-11T14:17:54","modified_gmt":"2017-01-11T06:17:54","slug":"%e3%80%90%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90%e3%80%91java%e7%af%87-integer","status":"publish","type":"post","link":"http:\/\/prayerlaputa.com\/?p=258","title":{"rendered":"\u3010\u6e90\u7801\u5206\u6790\u3011java sdk\u7bc7\u2013Integer"},"content":{"rendered":"

\u4eca\u5929\u7528\u5230\u4e86Java\u4e2dInteger.highestOneBit\u65b9\u6cd5\uff0c\u4e4b\u524d\u8fd8\u771f\u6ca1\u6ce8\u610fInteger\u4e2d\u8fd8\u6709\u4f4d\u8fd0\u7b97\u76f8\u5173\u7684\u65b9\u6cd5\uff0c\u8fd9\u91cc\u7b80\u5355\u5217\u4e3e\u4e00\u4e0b\uff0c\u65b9\u4fbf\u540e\u7eed\u67e5\uff1a
\na. highestOneBit(i)
\n\u5982\u679c\u4e00\u4e2a\u6570\u662f0, \u5219\u8fd4\u56de0
\n\u5982\u679c\u662f\u8d1f\u6570, \u5219\u8fd4\u56de -2147483648 1000,0000,0000,0000,0000,0000,0000,0000(\u4e8c\u8fdb\u5236\u8868\u793a\u7684\u6570)
\n\u5982\u679c\u662f\u6b63\u6570, \u8fd4\u56de\u7684\u5219\u662f\u8ddf\u5b83\u6700\u9760\u8fd1\u7684\u6bd4\u5b83\u5c0f\u76842\u7684N\u6b21\u65b9
\n\u6b63\u6570\u30010\u597d\u89e3\u91ca\uff0c\u81f3\u4e8e\u8d1f\u6570\uff0c\u7531\u4e8e\u8ba1\u7b97\u673a\u4e2d\u7684\u6570\u5b57\u90fd\u662f\u91c7\u7528\u8865\u7801\u8868\u793a\uff0c\u5373\u53cd\u7801+1\uff0c\u5e76\u4e14\u6700\u9ad8\u4f4d\u662f\u4e00\u4e2a1\u3001\u8868\u793a\u8d1f\u6570\uff0c\u56e0\u6b64\u8fd9\u4e2a\u7b26\u53f7\u4f4d\u4f5c\u4e3a\u6700\u7ec8\u7ed3\u679c\u8fd4\u56de\u3002
\n\u8be5\u65b9\u6cd5\u5185\u90e8\u5b9e\u73b0\u5f88\u7b80\u5355\uff0c\u5177\u4f53\u5206\u6790\u53ef\u4ee5\u53c2\u8003\u8fd9\u7bc7\u6587\u7ae0\uff1aJava Integer.highestOneBit(i)\u4ee3\u7801\u54c1\u8bfb<\/a>\u00a0\uff08\u8fd9\u6587\u7ae0\u91cc\u987a\u4fbf\u590d\u4e60\u4e86\u4e00\u4e0b\u6709\u5173\u4f4d\u8fd0\u7b97\u7684\u77e5\u8bc6\uff0c\u9700\u8981\u7684\u7ae5\u978b\u53ef\u4ee5\u770b\u770b\uff09
\nb.\u00a0lowestOneBit(i)
\nAPI\u8bf4\u660e\u770b\u7740\u6709\u70b9\u7ed5\uff0c\u4f46\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u548c\u4e0a\u9762\u7684highestOneBit\u76f8\u53cd\uff0c\u8fd4\u56de\u4e00\u4e2a\u6570\uff0c\u8fd9\u4e2a\u6570\u6700\u591a\u53ea\u5305\u542bi\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u6700\u4f4e\u4f4d\u76841
\n\u5185\u90e8\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n

\npublic static int lowestOneBit(int i) {\n  return i &amp;amp;amp;amp; -i;\n }\n<\/pre>\n
\u4ecd\u7136\u662f\u5229\u7528\u4e86\u539f\u7801\u3001\u8865\u7801\u3001\u53cd\u7801\u7684\u77e5\u8bc6\uff1a
\ni=0\u5219\u8fd4\u56de0\uff1b
\ni\u4e0d\u7b49\u4e8e0\uff0c\u90a3\u4e48i\u548c-i\u4e2d\u4e00\u4e2a\u662f\u539f\u7801\u3001\u4e00\u4e2a\u662f\u53cd\u7801+1\uff0c\u5047\u5b9a-i\u662f\u90a3\u4e2a\u53cd\u7801+1\u7684\u6570\uff0ci\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u6700\u4f4e\u4f4d\u662f\u4ece\u53f3\u5f80\u5de6\u7684\u7b2cm\u4f4d\uff0c\u90a3\u4e48i\u548c-i\u4ece\u7b2cm+1\u4f4d\u5f00\u59cb\uff0c\u7531\u4e8e\u5206\u522b\u662f\u6b63\u7801\u4ee5\u53ca\u5bf9\u5e94\u7684\u53cd\u7801\uff0c\u8fdb\u884c\u5b89\u6170\u4e0e\u64cd\u4f5c\u540e\u76f4\u63a5\u53d8\u4e3a0\uff0c\u7b2cm\u4f4d\u5219\u7531\u4e8e\u53cd\u7801\u52a0\u4e861\u7684\u7f18\u6545\uff0c\u4fdd\u7559\u4e0b\u6765\uff0c\u5373\u5f97\u7ed3\u679c\u3002
\nc.int numberOfLeadingZeros(int i)
\n\u5728\u6307\u5b9a int \u503c\u7684\u4e8c\u8fdb\u5236\u8865\u7801\u8868\u793a\u5f62\u5f0f\u4e2d\u6700\u9ad8\u4f4d\uff08\u6700\u5de6\u8fb9\uff09\u7684 1 \u4f4d\u4e4b\u524d\uff0c\u96f6\u4f4d\u7684\u6570\u91cf\u3002\uff08\u6ce8\uff1a\u4eceJDK 1.5\u624d\u6709\u8be5\u63a5\u53e3\uff09
\nd.\u00a0int numberOfTrailingZeros(int i)
\n\u8fd4\u56de\u6307\u5b9a\u7684 int \u503c\u7684\u4e8c\u8fdb\u5236\u8865\u7801\u8868\u793a\u5f62\u5f0f\u4e2d\u6700\u4f4e\uff08\u201c\u6700\u53f3\u8fb9\u201d\uff09\u7684\u4e3a 1 \u7684\u4f4d\u540e\u9762\u7684\u96f6\u4f4d\u4e2a\u6570\u3002\uff08\u6ce8\uff1a\u4eceJDK 1.5\u624d\u6709\u8be5\u63a5\u53e3\uff09
\ne.int bitCount(int i)
\n\u8fd4\u56de\u6307\u5b9a int \u503c\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u5f62\u5f0f\u7684 1 \u4f4d\u7684\u6570\u91cf\u3002\uff08\u6ce8\uff1a\u4eceJDK 1.5\u624d\u6709\u8be5\u63a5\u53e3\uff09
\n\u8be5\u65b9\u6cd5\u5b9e\u73b0\u770b\u4e0a\u53bb\u6709\u70b9\u83ab\u540d\u5176\u5999\uff0c\u5206\u6790\u53ef\u4ee5\u53c2\u8003\u8fd9\u7bc7\u6587\u7ae0\uff1a\u6c42\u4e8c\u8fdb\u5236\u6570\u4e2d1\u7684\u4e2a\u6570<\/a>
\nf.String toBinaryString(int i)
\n\u8fd4\u56de\u4e8c\u8fdb\u5236\u8868\u793a\u7684\u5b57\u7b26\u4e32
\ng.\u00a0String toHexString(int i)
\n\u8fd4\u56de\u5341\u516d\u8fdb\u5236\u8868\u793a\u7684\u5b57\u7b26\u4e32
\nh.String toOctalString(int i)
\n\u8fd4\u56de\u516b\u8fdb\u5236\u8868\u793a\u7684\u5b57\u7b26\u4e32
\ni.\u00a0String toUnsignedString(int i)
\n\u8fd4\u56dei\u5bf9\u5e94\u7684unsigned int\u6570\u5b57\u7684\u5b57\u7b26\u4e32\u8868\u793a\uff08\u6ce8\uff1a\u4eceJDK 1.8\u624d\u6709\u8be5\u63a5\u53e3\uff09
\nj.\u00a0String toUnsignedString(int i, int radix)
\n\u8fd4\u56dei\u5bf9\u5e94\u7684unsigned int\u6570\u5b57\u7684\u5b57\u7b26\u4e32\u8868\u793a\uff0c\u5e76\u4e14\u6839\u636eradix\u8fdb\u5236\u8fdb\u884c\u8f93\u51fa\uff08\u6ce8\uff1a\u4eceJDK 1.8\u624d\u6709\u8be5\u63a5\u53e3\uff09\u3002
\n\u6ce8\u610f\uff0c\u770b\u6e90\u4ee3\u7801\u53ef\u4ee5\u53d1\u73b0\uff0c\u76ee\u524dJDK 1.8\u4e2d\u7684\u8be5\u65b9\u6cd5\u53c2\u6570radix\u5b9e\u73b0\u4ec5\u652f\u63012~36\uff0cradix\u5927\u4e8e36\u5219\u6309\u7167radix=10\u8fdb\u884c\u8ba1\u7b97\uff0c\u8fd9\u4e00\u70b9\u9700\u8981\u6ce8\u610f\u3002
\n 
\n\u5217\u4e00\u4e0b\u611f\u89c9\u5e73\u65f6\u6ca1\u600e\u4e48\u7528\u8fc7\u3001\u4f46\u53ef\u80fd\u6bd4\u8f83\u6709\u7528\u7684\u65b9\u6cd5\uff0c\u5176\u4ed6\u65b9\u6cd5\u5e38\u7528\u5c31\u6ca1\u5fc5\u8981\u518d\u5217\u4e3e\u4e86\uff0c\u5c31\u9171\u7d2b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4eca\u5929\u7528\u5230\u4e86Java\u4e2dInteger.highestOneBit\u65b9\u6cd5\uff0c\u4e4b\u524d\u8fd8\u771f\u6ca1\u6ce8\u610fInteger\u4e2d\u8fd8\u6709\u4f4d\u8fd0\u7b97\u76f8 […]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[6,18],"tags":[33,50],"_links":{"self":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/258"}],"collection":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=258"}],"version-history":[{"count":0,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/258\/revisions"}],"wp:attachment":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=258"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}