美文网首页
听说今天是完全对称日

听说今天是完全对称日

作者: Jam_Lin | 来源:发表于2021-12-02 11:32 被阅读0次

    那就写一个输出全部完全对称日的程序来纪念这一天吧2333

    import java.text.SimpleDateFormat;
    
    public class App {
    
        public static void main(String[] args) {
            for (int i = 1; i < 10000; i++) {
                String yyyy = Integer.toString(i);
                if (yyyy.length() < 4) {
                    for (int j = 0; j < 4 - yyyy.length(); j++) {
                        yyyy = "0" + yyyy;
                    }
                }
                String MMdd = new StringBuilder(yyyy).reverse().toString();
                if (isDate(yyyy + MMdd)) {
                    System.out.println(yyyy + "-" + MMdd.substring(0, 2) + "-" + MMdd.substring(2));
                }
            }
        }
    
        public static boolean isDate(String str) {
            boolean result = true;
            SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
            try {
                format.setLenient(false);
                format.parse(str);
            } catch (Exception e) {
                result = false;
            }
            return result;
        }
    
    }
    

    可以看到最近的几个完全对称日如下:


    最近的几个完全对称日

    2001年的完全对称日的上一个居然在1380年(明朝),真是神奇啊。

    全部的对称日为:

    0101-10-10
    0110-01-10
    0111-11-10
    0120-02-10
    0121-12-10
    0130-03-10
    0140-04-10
    0150-05-10
    0160-06-10
    0170-07-10
    0180-08-10
    0190-09-10
    0201-10-20
    0210-01-20
    0211-11-20
    0220-02-20
    0221-12-20
    0230-03-20
    0240-04-20
    0250-05-20
    0260-06-20
    0270-07-20
    0280-08-20
    0290-09-20
    0301-10-30
    0310-01-30
    0311-11-30
    0321-12-30
    0330-03-30
    0340-04-30
    0350-05-30
    0360-06-30
    0370-07-30
    0380-08-30
    0390-09-30
    1001-10-01
    1010-01-01
    1011-11-01
    1020-02-01
    1021-12-01
    1030-03-01
    1040-04-01
    1050-05-01
    1060-06-01
    1070-07-01
    1080-08-01
    1090-09-01
    1101-10-11
    1110-01-11
    1111-11-11
    1120-02-11
    1121-12-11
    1130-03-11
    1140-04-11
    1150-05-11
    1160-06-11
    1170-07-11
    1180-08-11
    1190-09-11
    1201-10-21
    1210-01-21
    1211-11-21
    1220-02-21
    1221-12-21
    1230-03-21
    1240-04-21
    1250-05-21
    1260-06-21
    1270-07-21
    1280-08-21
    1290-09-21
    1301-10-31
    1310-01-31
    1321-12-31
    1330-03-31
    1350-05-31
    1370-07-31
    1380-08-31
    2001-10-02
    2010-01-02
    2011-11-02
    2020-02-02
    2021-12-02
    2030-03-02
    2040-04-02
    2050-05-02
    2060-06-02
    2070-07-02
    2080-08-02
    2090-09-02
    2101-10-12
    2110-01-12
    2111-11-12
    2120-02-12
    2121-12-12
    2130-03-12
    2140-04-12
    2150-05-12
    2160-06-12
    2170-07-12
    2180-08-12
    2190-09-12
    2201-10-22
    2210-01-22
    2211-11-22
    2220-02-22
    2221-12-22
    2230-03-22
    2240-04-22
    2250-05-22
    2260-06-22
    2270-07-22
    2280-08-22
    2290-09-22
    3001-10-03
    3010-01-03
    3011-11-03
    3020-02-03
    3021-12-03
    3030-03-03
    3040-04-03
    3050-05-03
    3060-06-03
    3070-07-03
    3080-08-03
    3090-09-03
    3101-10-13
    3110-01-13
    3111-11-13
    3120-02-13
    3121-12-13
    3130-03-13
    3140-04-13
    3150-05-13
    3160-06-13
    3170-07-13
    3180-08-13
    3190-09-13
    3201-10-23
    3210-01-23
    3211-11-23
    3220-02-23
    3221-12-23
    3230-03-23
    3240-04-23
    3250-05-23
    3260-06-23
    3270-07-23
    3280-08-23
    3290-09-23
    4001-10-04
    4010-01-04
    4011-11-04
    4020-02-04
    4021-12-04
    4030-03-04
    4040-04-04
    4050-05-04
    4060-06-04
    4070-07-04
    4080-08-04
    4090-09-04
    4101-10-14
    4110-01-14
    4111-11-14
    4120-02-14
    4121-12-14
    4130-03-14
    4140-04-14
    4150-05-14
    4160-06-14
    4170-07-14
    4180-08-14
    4190-09-14
    4201-10-24
    4210-01-24
    4211-11-24
    4220-02-24
    4221-12-24
    4230-03-24
    4240-04-24
    4250-05-24
    4260-06-24
    4270-07-24
    4280-08-24
    4290-09-24
    5001-10-05
    5010-01-05
    5011-11-05
    5020-02-05
    5021-12-05
    5030-03-05
    5040-04-05
    5050-05-05
    5060-06-05
    5070-07-05
    5080-08-05
    5090-09-05
    5101-10-15
    5110-01-15
    5111-11-15
    5120-02-15
    5121-12-15
    5130-03-15
    5140-04-15
    5150-05-15
    5160-06-15
    5170-07-15
    5180-08-15
    5190-09-15
    5201-10-25
    5210-01-25
    5211-11-25
    5220-02-25
    5221-12-25
    5230-03-25
    5240-04-25
    5250-05-25
    5260-06-25
    5270-07-25
    5280-08-25
    5290-09-25
    6001-10-06
    6010-01-06
    6011-11-06
    6020-02-06
    6021-12-06
    6030-03-06
    6040-04-06
    6050-05-06
    6060-06-06
    6070-07-06
    6080-08-06
    6090-09-06
    6101-10-16
    6110-01-16
    6111-11-16
    6120-02-16
    6121-12-16
    6130-03-16
    6140-04-16
    6150-05-16
    6160-06-16
    6170-07-16
    6180-08-16
    6190-09-16
    6201-10-26
    6210-01-26
    6211-11-26
    6220-02-26
    6221-12-26
    6230-03-26
    6240-04-26
    6250-05-26
    6260-06-26
    6270-07-26
    6280-08-26
    6290-09-26
    7001-10-07
    7010-01-07
    7011-11-07
    7020-02-07
    7021-12-07
    7030-03-07
    7040-04-07
    7050-05-07
    7060-06-07
    7070-07-07
    7080-08-07
    7090-09-07
    7101-10-17
    7110-01-17
    7111-11-17
    7120-02-17
    7121-12-17
    7130-03-17
    7140-04-17
    7150-05-17
    7160-06-17
    7170-07-17
    7180-08-17
    7190-09-17
    7201-10-27
    7210-01-27
    7211-11-27
    7220-02-27
    7221-12-27
    7230-03-27
    7240-04-27
    7250-05-27
    7260-06-27
    7270-07-27
    7280-08-27
    7290-09-27
    8001-10-08
    8010-01-08
    8011-11-08
    8020-02-08
    8021-12-08
    8030-03-08
    8040-04-08
    8050-05-08
    8060-06-08
    8070-07-08
    8080-08-08
    8090-09-08
    8101-10-18
    8110-01-18
    8111-11-18
    8120-02-18
    8121-12-18
    8130-03-18
    8140-04-18
    8150-05-18
    8160-06-18
    8170-07-18
    8180-08-18
    8190-09-18
    8201-10-28
    8210-01-28
    8211-11-28
    8220-02-28
    8221-12-28
    8230-03-28
    8240-04-28
    8250-05-28
    8260-06-28
    8270-07-28
    8280-08-28
    8290-09-28
    9001-10-09
    9010-01-09
    9011-11-09
    9020-02-09
    9021-12-09
    9030-03-09
    9040-04-09
    9050-05-09
    9060-06-09
    9070-07-09
    9080-08-09
    9090-09-09
    9101-10-19
    9110-01-19
    9111-11-19
    9120-02-19
    9121-12-19
    9130-03-19
    9140-04-19
    9150-05-19
    9160-06-19
    9170-07-19
    9180-08-19
    9190-09-19
    9201-10-29
    9210-01-29
    9211-11-29
    9220-02-29
    9221-12-29
    9230-03-29
    9240-04-29
    9250-05-29
    9260-06-29
    9270-07-29
    9280-08-29
    9290-09-29
    

    相关文章

      网友评论

          本文标题:听说今天是完全对称日

          本文链接:https://www.haomeiwen.com/subject/kfyyxrtx.html