{"id":70,"date":"2023-02-12T21:15:55","date_gmt":"2023-02-12T13:15:55","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=70"},"modified":"2023-02-12T21:17:55","modified_gmt":"2023-02-12T13:17:55","slug":"java-fight-luck-red-envelope-algorithm","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/02\/12\/java-fight-luck-red-envelope-algorithm\/","title":{"rendered":"Java\u5b9e\u73b0\u62fc\u624b\u6c14\u7ea2\u5305\u7b97\u6cd5"},"content":{"rendered":"<p>\u5b9e\u73b0\u62fc\u624b\u6c14\u7ea2\u5305\u7b97\u6cd5\uff0c\u6709\u4ee5\u4e0b\u51e0\u4e2a\u9700\u8981\u6ce8\u610f\u7684\u5730\u65b9\uff1a<\/p>\n<ul>\n<li>\u62a2\u7ea2\u5305\u7684\u671f\u671b\u6536\u76ca\u5e94\u4e0e\u5148\u540e\u987a\u5e8f\u65e0\u5173<\/li>\n<li>\u4fdd\u8bc1\u6bcf\u4e2a\u7528\u6237\u81f3\u5c11\u80fd\u62a2\u5230\u4e00\u4e2a\u9884\u8bbe\u7684\u6700\u5c0f\u91d1\u989d\uff0c\u4eba\u6c11\u5e01\u7ea2\u5305\u8bbe\u7f6e\u7684\u6700\u5c0f\u91d1\u989d\u4e00\u822c\u662f0.01\u5143\uff0c\u5982\u679c\u9700\u8981\u53d1\u5176\u4ed6\u8d27\u5e01\u7c7b\u578b\u7684\u7ea2\u5305\uff0c\u6bd4\u5982\u533a\u5757\u94fe\u8d27\u5e01\u6216\u8005\u79ef\u5206\uff0c\u9700\u8981\u81ea\u5b9a\u4e49\u4e00\u4e2a\u6700\u5c0f\u91d1\u989d<\/li>\n<li>\u6240\u6709\u62a2\u7ea2\u5305\u7684\u4eba\u9886\u53d6\u7684\u5b50\u7ea2\u5305\u7684\u91d1\u989d\u4e4b\u548c\u52a0\u8d77\u6765\uff0c\u7b49\u4e8e\u53d1\u7ea2\u5305\u7684\u4eba\u53d1\u51fa\u7684\u603b\u7ea2\u5305\u7684\u91d1\u989d<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u5b9e\u73b0\u7684\u65b9\u5f0f\u662f\u4e00\u6b21\u751f\u6210\u6240\u6709\u7684\u5b50\u7ea2\u5305\uff0c\u8ba9\u7528\u6237\u6309\u987a\u5e8f\u9886\u53d6\u3002\u4e5f\u53ef\u4ee5\u6bcf\u9886\u53d6\u4e00\u4e2a\u751f\u6210\u4e00\u4e2a\uff0c\u4e24\u79cd\u65b9\u5f0f\u6027\u80fd\u4e0a\u5404\u6709\u4f18\u52a3\u3002<\/p>\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-java\">private static void randomHandOutAlgorithm(BigDecimal totalAmount, Integer size,\n                                    Integer scale, BigDecimal minAmount) {\n\n    \/\/\u5269\u4f59\u7ea2\u5305\u91d1\u989d\n    BigDecimal remainAmount = totalAmount.setScale(scale, BigDecimal.ROUND_DOWN);\n\n    \/\/\u5269\u4f59\u7ea2\u5305\u4e2a\u6570\n    Integer remainSize = size;\n\n    for (int i = 1; i &lt; size; i++) {\n        \/\/\u524dn-1\u4e2a\u7ea2\u5305\u7684\u91d1\u989d\uff0c\u7528\u968f\u673a\u7b97\u6cd5\n        BigDecimal random = BigDecimal.valueOf(Math.random());\n        BigDecimal halfRemainSize = BigDecimal.valueOf(remainSize).divide(new BigDecimal(2), BigDecimal.ROUND_UP);\n\n        \/\/\u8ba1\u7b97\u5355\u6b21\u7ea2\u5305\u7684\u6700\u5927\u503c\uff0c\u8be5\u7b97\u6cd5\u4e5f\u662f\u5fae\u4fe1\u7684\u7ea2\u5305\u7b97\u6cd5\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u62a2\u7ea2\u5305\u7684\u671f\u671b\u6536\u76ca\u5e94\u4e0e\u5148\u540e\u987a\u5e8f\u65e0\u5173\uff0c\u4f46\u540e\u62a2\u7ea2\u5305\u7684\u65b9\u5dee\u66f4\u5927\uff0c\u56e0\u6b64\u624b\u6c14\u6700\u4f73\u66f4\u53ef\u80fd\u5728\u540e\u62a2\u7684\u4eba\u4e2d\u8bde\u751f\n        BigDecimal max1 = remainAmount.divide(halfRemainSize, BigDecimal.ROUND_DOWN);\n\n        \/\/\u540c\u65f6\uff0c\u6700\u5927\u503c\u9700\u8981\u4fdd\u8bc1\uff0c\u51cf\u53bb\u8be5\u7ea2\u5305\u540e\uff0c\u5269\u4e0b\u7684\u7ea2\u5305\u8db3\u4ee5\u6ee1\u8db3\u5269\u4f59\u4eba\u6570\u7684\u6700\u5c0f\u91d1\u989d\n        BigDecimal minRemainAmount = minAmount.multiply(BigDecimal.valueOf(remainSize - 1)).setScale(scale, BigDecimal.ROUND_DOWN);\n        BigDecimal max2 = remainAmount.subtract(minRemainAmount);\n\n        \/\/\u6700\u7ec8\uff0c\u5355\u6b21\u7ea2\u5305\u7684\u6700\u5927\u503c\u7b49\u4e8e\u4e24\u4e2a\u6700\u5927\u503c\u4e2d\u8f83\u5c0f\u7684\u4e00\u4e2a\n        BigDecimal max = (max1.compareTo(max2) &lt; 0) ? max1 : max2;\n        BigDecimal amount = random.multiply(max).setScale(scale, BigDecimal.ROUND_DOWN);\n        System.out.println(amount);\n\n        \/\/\u6bcf\u4e2a\u7ea2\u5305\u7684\u6570\u989d\u4e0d\u80fd\u5c0f\u4e8e\u9884\u8bbe\u7684\u6700\u5c0f\u91d1\u989d\n        if (amount.compareTo(minAmount) &lt; 0) {\n            amount = minAmount;\n        }\n\n        remainAmount = remainAmount.subtract(amount).setScale(scale, BigDecimal.ROUND_DOWN);\n        remainSize = remainSize - 1;\n    }\n\n    \/\/\u6700\u540e\u4e00\u4e2a\u7ea2\u5305\uff0c\u91d1\u989d\u7b49\u4e8e\u5269\u4f59\u91d1\u989d\n    BigDecimal amount = remainAmount;\n    System.out.println(amount);\n}<\/code><\/pre>\n<p>\u6700\u540e\uff0c\u672a\u9886\u53d6\u7684\u91d1\u989d\u9700\u8981\u9000\u56de\u7ed9\u53d1\u7ea2\u5305\u7684\u7528\u6237\u3002\u5199\u4e00\u4e2a\u5b9a\u65f6\u4efb\u52a1\uff0c\u5c06\u672a\u9886\u53d6\u7684\u5b50\u7ea2\u5305\u9000\u56de\u5373\u53ef\u3002<\/p>\n<p>\u5982\u679c\u5728\u7528\u6237\u6bcf\u6b21\u9886\u53d6\u7ea2\u5305\u7684\u65f6\u5019\u751f\u6210\u4e00\u4e2a\u5b50\u7ea2\u5305\uff0c\u7b97\u6cd5\u4e5f\u662f\u4e00\u6837\u7684\uff0c\u53ea\u662f\u6bcf\u9886\u53d6\u4e00\u6b21\u5b50\u7ea2\u5305\u540e\uff0c\u90fd\u8981\u66f4\u65b0\u603b\u7ea2\u5305\u7684\u4f59\u989d\u548c\u5269\u4f59\u6570\u91cf\uff0c\u7136\u540e\u5728\u9000\u56de\u8fc7\u671f\u7ea2\u5305\u65f6\uff0c\u5c06\u603b\u7ea2\u5305\u7684\u4f59\u989d\u9000\u56de\u7ed9\u53d1\u7ea2\u5305\u7684\u7528\u6237\u5373\u53ef\u3002<\/p>\n<pre><code class=\"language-java\">randomHandOutAlgorithm(new BigDecimal(&quot;5&quot;), 5, 2, new BigDecimal(&quot;0.01&quot;));\n\n1.22\n0.97\n0.60\n0.85\n1.36<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5b9e\u73b0\u62fc\u624b\u6c14\u7ea2\u5305\u7b97\u6cd5\uff0c\u6709\u4ee5\u4e0b\u51e0\u4e2a\u9700\u8981\u6ce8\u610f\u7684\u5730\u65b9\uff1a \u62a2\u7ea2\u5305\u7684\u671f\u671b\u6536\u76ca\u5e94\u4e0e\u5148\u540e\u987a\u5e8f\u65e0\u5173 \u4fdd\u8bc1\u6bcf\u4e2a\u7528\u6237\u81f3\u5c11\u80fd\u62a2\u5230\u4e00\u4e2a\u9884 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[],"class_list":["post-70","post","type-post","status-publish","format-standard","hentry","category-data-structure-algorithm"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/70","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=70"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/70\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=70"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=70"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=70"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}