{"id":2279,"date":"2020-09-21T08:49:31","date_gmt":"2020-09-21T00:49:31","guid":{"rendered":"http:\/\/admin.evshou.com\/?p=2279"},"modified":"2020-09-22T10:44:38","modified_gmt":"2020-09-22T02:44:38","slug":"2020java%e6%95%99%e7%a8%8b%ef%bc%9ajavase%e5%9f%ba%e7%a1%80%e7%bb%bc%e5%90%88%e4%b9%a0%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.9713job.com\/?p=2279","title":{"rendered":"2020java\u6559\u7a0b\uff1ajavaSE\u57fa\u7840\u7efc\u5408\u4e60\u9898"},"content":{"rendered":"

javaSE\u57fa\u7840\u7efc\u5408\u4e60\u9898<\/h3>\n

1.(\u5faa\u73af)\u8f93\u5165\u4e00\u4e2a\u6574\u6570\uff0c\u8ba1\u7b97\u5b83\u5404\u4f4d\u4e0a\u6570\u5b57\u7684\u548c\u3002\uff08\u6ce8\u610f\uff1a\u662f\u4efb\u610f\u4f4d\u7684\u6574\u6570\uff09<\/p>\n

import java.util.Scanner;\r\n\r\npublic class demos{\r\n    public static void main(String[] args) {\r\n        Scanner sc=new Scanner(System.in);\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u6574\u6570\");\r\n        int n=sc.nextInt();\r\n        int sum=0;\r\n        for(int i=0;i<n;i++){\r\n            sum+=n%10;\r\n            n=n\/10;\r\n        }\r\n        System.out.println(sum);\r\n    }\r\n}<\/pre>\n
<\/p>\n
2.\uff08\u5faa\u73af\uff09\u8ba1\u7b97\u5706\u5468\u7387
\n\u4e2d\u56fd\u53e4\u4ee3\u6570\u5b66\u5bb6\u7814\u7a76\u51fa\u4e86\u8ba1\u7b97\u5706\u5468\u7387\u6700\u7b80\u5355\u7684\u529e\u6cd5:
\nPI=4\/1-4\/3+4\/5-4\/7+4\/9-4\/11+4\/13-4\/15+4\/17
\n\u8fd9\u4e2a\u7b97\u5f0f\u7684\u7ed3\u679c\u4f1a\u65e0\u9650\u63a5\u8fd1\u4e8e\u5706\u5468\u7387\u7684\u503c,\u6211\u56fd\u53e4\u4ee3\u6570\u5b66\u5bb6\u7956\u51b2\u4e4b\u8ba1\u7b97\u51fa,\u5706\u5468\u7387\u5728 3.1415926 \u548c
\n3.1415927 \u4e4b\u95f4,\u8bf7\u7f16\u7a0b\u8ba1\u7b97,\u8981\u60f3\u5f97\u5230\u8fd9\u6837\u7684\u7ed3\u679c,\u4ed6\u8981\u7ecf\u8fc7\u591a\u5c11\u6b21\u52a0\u51cf\u6cd5\u8fd0\u7b97?<\/p>\n
public class demos{\r\n    public static void main(String[] args) {\r\n        double pi=0;\/\/\u7d2f\u52a0pi\u7684\u503c\r\n        double a=1;\/\/\u5206\u6bcd\r\n        int b=1;\/\/\u8ba1\u7b97\u662f\u52a0\u8fd8\u662f\u51cf\r\n        int i=0;\/\/\u8ba1\u6570\u5668\r\n        while (pi < 3.1415926 || pi > 3.1415927) {\r\n            \/*\r\n            pi=4\/1-4\/3+4\/5-4....\r\n             *\/\r\n            pi+=b*4\/a;\/\/pi=0+1*4\/1(pi=4\/1)   pi=4+-1*4\/3(pi=4+-4\/3)\r\n            i++;\/\/i=1 i=2\r\n            b*=-1;\/\/b=1*-1(-1)  b=-1*-1(1)\r\n            a+=2;\/\/a=a+2(a=3.0) a=3.0+2(5)\r\n        }\r\n        System.out.println(i);\r\n    }\r\n}<\/pre>\n
3.(\u6570\u7ec4)\u7b5b\u9009\u6cd5\u6c42\u8d28\u6570
\n\u8f93\u5165\u4e00\u4e2a\u6574\u6570n\uff0c\u6c42\u5c0f\u4e8e\u8fd9\u4e2a\u6574\u6570\u7684\u6240\u6709\u8d28\u6570\u3002
\n\u7b97\u6cd5\uff1a\u5b9a\u4e49\u4e00\u4e2a\u957f\u5ea6\u4e3an\u7684\u5e03\u5c14\u6570\u7ec4\uff0ctrue\u4e3a\u8d28\u6570\uff0cfalse\u4e3a\u4e0d\u662f\u8d28\u6570\u3002
\n\u521d\u59cb\u5747\u4e3atrue\uff0c\u4e4b\u540e\u4ece2\u5f00\u59cb\u5faa\u73af\uff1a
\n1.\u627e\u5230\u7b2c\u4e00\u4e2a\u4e3atrue\u7684\u4e0b\u6807i
\n2.\u628a\u6240\u6709\u4e0b\u6807i\u7684\u500d\u6570\u7684\u503c\u91cd\u7f6e\u4e3afalse
\n3.\u76f4\u5230\u626b\u63cf\u5b8c\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u6570\u503c\u3002
\n4.\u6700\u540e\u904d\u5386\u6570\u7ec4\uff0c\u5982\u679c\u4e0b\u6807i\u7684\u503c\u4e3atrue\uff0c\u5219\u8bf4\u660e i\u4e3a\u8d28\u6570<\/p>\n
import java.util.Scanner;\r\n\r\npublic class demos{\r\n    public static void main(String[] args) {\r\n        Scanner sc=new Scanner(System.in);\r\n        System.out.println(\"\u8bf7\u8f93\u5165\u6574\u6570\");\r\n        int n=sc.nextInt();\r\n        boolean[] b=new boolean[n+1];\/\/\u521d\u59cb\u5316\u6570\u7ec4\r\n        \/\/\u6570\u7ec4\u521d\u59cb\u503c\u5747\u4e3atrue\r\n        for(int i=0;i<b.length;i++){\r\n            b[i]=true;\r\n        }\r\n        \/\/\u4ece2\u5f00\u59cb\u5faa\u73af\r\n        for(int i=2;i<b.length;i++){\r\n            if(b[i]){\/\/\u5982\u679c\u5e03\u5c14\u6570\u7ec4\u5b58\u6709true\r\n                \/\/\u5c06i\u7684\u500d\u6570\u6240\u6709\u503c\u91cd\u7f6e\u4e3afalse\r\n                for(int j=i*2;j<b.length;j+=i){\r\n                    b[j]=false;\r\n                }\r\n            }else continue;\/\/\u5426\u5219\u8df3\u8fc7\r\n        }\r\n        \/\/\u5faa\u73af\u904d\u5386\u6253\u5370\u6570\u7ec4\r\n        for(int i=2;i<b.length;i++){\r\n            if(b[i]){\r\n                System.out.print(i+\"\\t\");\r\n            }\r\n        }\r\n        System.out.println();\r\n    }\r\n}<\/pre>\n
4.\uff08\u6570\u7ec4\uff09\u5341\u4e94\u4e2a\u7334\u5b50\u56f4\u6210\u4e00\u5708\u9009\u5927\u738b\uff0c\u4f9d\u6b21 1-7 \u5faa\u73af\u62a5\u6570\uff0c\u62a5\u5230 7 \u7684\u7334\u5b50\u88ab\u6dd8\u6c70\uff0c\u76f4\u5230\u6700\u540e\u4e00\u53ea\u7334\u5b50\u6210
\n\u4e3a\u5927\u738b\u3002\u95ee\uff0c\u54ea\u53ea\u7334\u5b50\u6700\u540e\u80fd\u6210\u4e3a\u5927\u738b\uff1f<\/p>\n
public class demos{\r\n    public static void main(String[] args) {\r\n        int size=15;\r\n        \/\/true\u6dd8\u6c70 false\u6ca1\u6dd8\u6c70\r\n        boolean[] b=new boolean[15];\r\n        int num=1;\r\n        int index=0;\r\n        while (size > 1) {\r\n            if(!b[index]){\r\n                num++;\r\n                if(num==8){\r\n                    b[index]=true;\r\n                    num=1;\r\n                    size--;\r\n                }\r\n            }\r\n            index++;\r\n            if (index == 15) {\r\n                index=0;\r\n            }\r\n        }\r\n        for(int i=0;i<b.length;i++){\r\n            if(!b[i]){\r\n                System.out.println(i+1);\r\n            }\r\n        }\r\n    }\r\n}<\/pre>\n
5.\uff08\u6570\u7ec4\uff09\u516b\u7687\u540e\u95ee\u9898
\n\u5728 8\u00d78 \u7684\u56fd\u9645\u8c61\u68cb\u76d8\u4e0a\uff0c\u653e\u7f6e\u516b\u4e2a\u7687\u540e\uff0c\u4f7f\u4efb\u4f55\u4e00\u4e2a\u7687\u540e\u90fd\u4e0d\u80fd\u5403\u6389\u53e6\u4e00\u4e2a\u3002\u56fd \u9645\u8c61\u68cb\u89c4\u5219\u4e2d\uff0c\u7687\u540e
\n\u53ef\u4ee5\u5403\u5230\u4efb\u4f55\u4e00\u4e2a\u4e0e\u4ed6\u5728\u540c\u4e00\u884c\u3001\u540c\u4e00\u5217\u6216\u8005\u540c\u4e00\u659c\u7ebf\u4e0a\u7684\u654c\u65b9\u68cb\u5b50\uff0c\u6240\u4ee5\u516b\u7687\u540e\u95ee\u9898\u7684\u6240\u6709\u89e3\u6ee1\u8db3\u30028
\n\u4e2a\u7687\u540e\u90fd\u4e0d\u5728\u540c\u4e00\u884c\u3001\u540c\u4e00\u5217\uff0c\u6216\u8005\u540c\u4e00\u659c\u7ebf\u4e0a\u3002
\n\u8f93\u51fa\u6240\u6709\u7684\u89e3\u3002
\n\u63d0\u793a\uff1a\u4f7f\u7528\u9012\u5f52\u3002<\/p>\n
public class EightQueen {\r\n   \r\n   static int[] queens = new int[8]; \/\/\u8868\u793a\u6bcf\u4e00\u884c\u7687\u540e\u7684\u7eb5\u5750\u6807\r\n   static int solveNum = 1; \/\/\u7edf\u8ba1\u89e3\u7684\u6570\u91cf\r\n   public static void main(String[] args) {\r\n      put(0);\r\n   }\r\n   \r\n   \/\/\u5224\u65ad\u5728\u4e4b\u524d\u7684\u57fa\u7840\u4e0a\u5728\u7b2cn\u884c\u653e\u7b2cm\u5217\u662f\u5426\u53ef\u884c\r\n   public static boolean canPut(int n, int m){\r\n      \/\/\u5224\u65ad\u662f\u5426\u6709\u5728\u540c\u4e00\u5217\u7684\r\n      for(int i = 0; i<n; i++){\r\n         if (queens[i] == m) return false;\r\n      }\r\n      \/\/\u5224\u65ad\u662f\u5426\u6709\u5728\u5de6\u4e0a-->\u53f3\u4e0b\u5bf9\u89d2\u7ebf\r\n      for(int i = 0; i<n; i++){\r\n         if (queens[i] - i == m - n) return false;\r\n      }\r\n      \r\n      \/\/\u5224\u65ad\u662f\u5426\u6709\u5728\u53f3\u4e0a-->\u5de6\u4e0b\u5bf9\u89d2\u7ebf\r\n      for(int i = 0; i<n; i++){\r\n         if (queens[i] + i == m + n) return false;\r\n      }\r\n      return true;\r\n   }\r\n   \r\n   \/\/\u8868\u793a\u5c1d\u8bd5\u653e\u7f6e\u7b2cn\u884c\u7684\u7687\u540e\r\n   public static void put(int n){\r\n      if (n == 8){\r\n         System.out.println(solveNum++);\r\n         printQueen();\r\n         return;\r\n      }\r\n      for(int i = 0; i<queens.length; i++){\r\n         if (canPut(n, i)){\r\n            queens[n] = i;\r\n            put(n+1);\r\n            queens[n] = 0;\r\n         }\r\n      }\r\n   }\r\n   public static void printQueen(){\r\n      for(int i = 0; i<queens.length; i++){\r\n         for(int j = 0; j<queens.length; j++){\r\n            if (queens[i] == j){\r\n               System.out.print(\"*\");\r\n            }else{\r\n               System.out.print(\" \");\r\n            }\r\n         }\r\n         System.out.println();\r\n      }\r\n   }\r\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"
javaSE\u57fa\u7840\u7efc\u5408\u4e60\u9898 1.(\u5faa\u73af)\u8f93\u5165\u4e00\u4e2a\u6574\u6570\uff0c\u8ba1\u7b97\u5b83\u5404\u4f4d\u4e0a\u6570\u5b57\u7684\u548c\u3002\uff08\u6ce8\u610f\uff1a\u662f\u4efb\u610f\u4f4d\u7684\u6574\u6570\uff09 impor […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2279","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2279"}],"version-history":[{"count":10,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2279\/revisions"}],"predecessor-version":[{"id":2292,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2279\/revisions\/2292"}],"wp:attachment":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}