24. Gas Saving Algorithm

Package com. rytong. hnair;

Import java. util. calendar;
Import java. util. hashmap;
Import java. util. Map;

/**
* Describe: 24 solar terms
*
* Note: For information about the formula used in the program for calculating the solar term and the constant of the solar term century, see
*
* The majority of the results of program running are correct, and a few are incorrect.
*/
Public class solarterms {
Private Static final double D = 0.2422;
Private Final Static Map <string, integer []> increase_offsetmap = new hashmap <string, integer []> (); // + 1 offset
Private Final Static Map <string, integer []> decrease_offsetmap = new hashmap <string, integer []> (); //-1 offset

/** 24 solar terms **/
Private Static Enum solartermsenum {
Lichun, // -- Lichun
Yushui, // -- rain
Jingzhe, // -- stunned
Chunfen, // Spring Equinox
Qingming, // Pure Brightness
Guyu, // Gu Yu
Lixia, // lixia
Xiaoman, // Xiao man
Mangzhong, // Mountain
Xiazhi, // summer solstice
Xiaoshu, // slight heat
Dashu, // heat
Liqiu, // liqiu
Chushu, // heatmap
Bailu, // White Dew
Qiufen, // autumn score
Hanlu, // Cold Dew
Shuangjiang, // frost
Lidong, // Lidong
Xiaoxue, // Xiaoxue
DAXUE, // heavy snow
Dongzhi, // winter solstice
Xiaohan, // Xiaohan
Dahan; // Dahan
}

Static {
Decrease_offsetmap.put (solartermsenum. yushui. Name (), new integer [] {2026}); // rain
Increase_offsetmap.put (solartermsenum. chunfen. Name (), new integer [] {2084}); // Spring Equinox
Increase_offsetmap.put (solartermsenum. xiaoman. Name (), new integer [] {2008}); // fill
Increase_offsetmap.put (solartermsenum. mangzhong. Name (), new integer [] {1902}); // Mountain
Increase_offsetmap.put (solartermsenum. xiazhi. Name (), new integer [] {1928}); // summer solstice
Increase_offsetmap.put (solartermsenum. Xiaoshu. Name (), new integer [] {1925,201 6}); // slight heat
Increase_offsetmap.put (solartermsenum. dashu. Name (), new integer [] {1922}); // heat
Increase_offsetmap.put (solartermsenum. liqiu. Name (), new integer [] {2002}); // liqiu
Increase_offsetmap.put (solartermsenum. Bailu. Name (), new integer [] {1927}); // White Dew
Increase_offsetmap.put (solartermsenum. qiufen. Name (), new integer [] {1942}); // autumn score
Increase_offsetmap.put (solartermsenum. shuangjiang. Name (), new integer [] {2089}); // frost
Increase_offsetmap.put (solartermsenum. Lidong. Name (), new integer [] {2089}); // early winter
Increase_offsetmap.put (solartermsenum. Xiaoxue. Name (), new integer [] {1978}); // light snow
Increase_offsetmap.put (solartermsenum. DAXUE. Name (), new integer [] {1954}); // heavy snow
Decrease_offsetmap.put (solartermsenum. Dongzhi. Name (), new integer [] {1918,202 1}); // winter solstice

Increase_offsetmap.put (solartermsenum. Xiaohan. Name (), new integer [] {1982}); // small cold
Decrease_offsetmap.put (solartermsenum. Xiaohan. Name (), new integer [] {2019}); // small cold

Increase_offsetmap.put (solartermsenum. Dahan. Name (), new integer [] {2082}); // Dahan
}

// Define a two-dimensional array. The first-dimensional array stores the C value of the 20th century solar energy, and the second-dimensional array stores the C value of the 21st century solar energy, ranging from 0 to 23, represent spring, rain in turn... C value of big cold and solar energy
Private Static final double [] [] century_array = {
{4.6295, 19.4599, 6.3826, 21.4155, 5.59, 20.888, 6.318, 21.86, 6.5, 22.2, 7.928, 23.65, 8.35, 23.95, 8.44,
23.822, 9.098, 24.218, 8.218, 23.08, 7.9, 22.6, 6.11, 20.84 },
{3.87, 18.73, 5.63, 20.646, 4.81, 20.1, 5.52, 21.04, 5.678, 21.37, 7.108, 22.83, 7.5, 23.13, 7.646,
23.042, 8.318, 23.438, 7.438, 22.36, 7.18, 21.94, 5.4055, 20.12 }};

/**
*
* @ Param year
* Year
* @ Param name
* Term name
* @ Return returns the day of the corresponding month.
*/
Public static int getsolartermnum (INT year, string name ){

Double centuryvalue = 0; // The century value of the solar term. Each century value of the solar term is different.
Name = Name. Trim (). touppercase ();
Int ordinal = solartermsenum. valueof (name). ordinal ();

Int centuryindex =-1;
If (Year> = 1901 & year <= 2000) {// 20th Century
Centuryindex = 0;
} Else if (Year> = 2001 & year <= 2100) {// 21st Century
Centuryindex = 1;
} Else {
Throw new runtimeexception ("this year is not supported:" + year + ", currently only the time range from January 1, 1901 to January 1, 2100 ");
}
Centuryvalue = century_array [centuryindex] [ordinal];
Int datenum = 0;
/**
* Calculate num = [y * D + C]-l this is a general formula of the legendary life star. Interpretation: after the second digit of the number of years is multiplied by 0.2422 plus C (I .e. centuryvalue, leap year reduction
*/
Int y = year % 100; // Step 1: Take the last two digits of the year
If (Year % 4 = 0 & amp; Year % 100! = 0 | year % 400 = 0) {// leap year
If (ordinal = solartermsenum. Xiaohan. ordinal () | ordinal = solartermsenum. Dahan. ordinal ()
| Ordinal = solartermsenum. Lichun. ordinal () | ordinal = solartermsenum. yushui. ordinal ()){
// Note: Any leap year before March 1 leap years to reduce one, namely: L = [(Y-1)/4], because small cold, big cold, spring, rain these two solar terms are less than March 1, so y = Y-1
Y = Y-1; // Step 2
}
}
Datenum = (INT) (y * D + centuryvalue)-(INT) (y/4); // step 3, use the formula [y * D + C]-l for Calculation
Datenum + = specialyearoffset (year, name); // Step 4, with the special year offset
Return datenum;
}

/**
* In special cases, due to the imperfect formula, the number of days of a certain solar term is not accurate, and the offset is returned here.
*
* @ Param year
* Year
* @ Param name
* Term name
* @ Return returns its offset.
*/
Public static int specialyearoffset (INT year, string name ){
Int offset = 0;
Offset + = getoffset (decrease_offsetmap, year, name,-1 );
Offset + = getoffset (increase_offsetmap, year, name, 1 );

Return offset;
}

Public static int getoffset (Map <string, integer []> map, int year, string name, int offset ){
Int off = 0;
Integer [] years = map. Get (name );
If (null! = Years ){
For (int I: years ){
If (I = year ){
Off = offset;
Break;
}
}
}
Return off;
}

Public static string solartermtostring (INT year ){
Stringbuffer sb = new stringbuffer ();
// Sb. append ("---"). append (year );
// If (Year % 4 = 0 & year % 100! = 0 | year % 400 = 0) {// leap year
// Sb. append (" ");
//} Else {
// Sb. append (" ");
//}

// Sb. append ("\ n "). append ("Spring: February "). append (getsolartermnum (year, solartermsenum. lichun. name ())). append ("day, rain: February ")
//. Append (getsolartermnum (year, solartermsenum. yushui. Name (). append ("day, shocking: March"). append (
// Getsolartermnum (year, solartermsenum. Jingzhe. Name (). append ("day, Spring Equinox: March"). append (
// Getsolartermnum (year, solartermsenum. chunfen. Name (). append ("day,: April"). append (
// Getsolartermnum (year, solartermsenum. Qingming. Name (). append ("day, grain rain: April"). append (
// Getsolartermnum (year, solartermsenum. Guyu. Name (). append ("day, summer: May"). append (
// Getsolartermnum (year, solartermsenum. lixia. Name (). append ("day, fill: May"). append (
// Getsolartermnum (year, solartermsenum. xiaoman. Name (). append ("day, mountain: June"). append (
// Getsolartermnum (year, solartermsenum. mangzhong. Name (). append ("day, Summer Solstice: June"). append (
// Getsolartermnum (year, solartermsenum. xiazhi. Name (). append ("day, summer heat: July"). append (
// Getsolartermnum (year, solartermsenum. Xiaoshu. Name (). append ("day, heat: July"). append (
// Getsolartermnum (year, solartermsenum. dashu. Name (). append ("day, \ n: August"). append (
// Getsolartermnum (year, solartermsenum. liqiu. Name (). append ("day, heat: August"). append (
// Getsolartermnum (year, solartermsenum. chushu. Name (). append ("day, white dew: September"). append (
// Getsolartermnum (year, solartermsenum. Bailu. Name (). append ("day, autumn: September"). append (
// Getsolartermnum (year, solartermsenum. qiufen. Name (). append ("day, Cold Dew: October"). append (
// Getsolartermnum (year, solartermsenum. hanlu. Name (). append ("day, Frost: October"). append (
// Getsolartermnum (year, solartermsenum. shuangjiang. Name (). append ("day, Winter: November"). append (
// Getsolartermnum (year, solartermsenum. Lidong. Name (). append ("day, snow: November"). append (
// Getsolartermnum (year, solartermsenum. Xiaoxue. Name (). append ("day, heavy snow: December"). append (
// Getsolartermnum (year, solartermsenum. DAXUE. Name (). append ("day, Winter Solstice: December"). append (
// Getsolartermnum (year, solartermsenum. Dongzhi. Name (). append ("day, cold: January"). append (
// Getsolartermnum (year, solartermsenum. Xiaohan. Name (). append ("day, big cold: January"). append (
// Getsolartermnum (year, solartermsenum. Dahan. Name ()));
SB. append ("2:"). append (getsolartermnum (year, solartermsenum. Lichun. Name (). append (", 2:"). append (
Getsolartermnum (year, solartermsenum. yushui. Name (). append (", 3:"). append (
Getsolartermnum (year, solartermsenum. Jingzhe. Name (). append (", 3:"). append (
Getsolartermnum (year, solartermsenum. chunfen. Name (). append (", 4:"). append (
Getsolartermnum (year, solartermsenum. Qingming. Name (). append (", 4:"). append (
Getsolartermnum (year, solartermsenum. Guyu. Name (). append (", 5:"). append (
Getsolartermnum (year, solartermsenum. lixia. Name (). append (", 5:"). append (
Getsolartermnum (year, solartermsenum. xiaoman. Name (). append (", 6:"). append (
Getsolartermnum (year, solartermsenum. mangzhong. Name (). append (", 6:"). append (
Getsolartermnum (year, solartermsenum. xiazhi. Name (). append (", 7:"). append (
Getsolartermnum (year, solartermsenum. Xiaoshu. Name (). append (", 7:"). append (
Getsolartermnum (year, solartermsenum. dashu. Name (). append (", 8:"). append (
Getsolartermnum (year, solartermsenum. liqiu. Name (). append (", 8:"). append (
Getsolartermnum (year, solartermsenum. chushu. Name (). append (", 9:"). append (
Getsolartermnum (year, solartermsenum. Bailu. Name (). append (", 9:"). append (
Getsolartermnum (year, solartermsenum. qiufen. Name (). append (", 10:"). append (
Getsolartermnum (year, solartermsenum. hanlu. Name (). append (", 10:"). append (
Getsolartermnum (year, solartermsenum. shuangjiang. Name (). append (", 11:"). append (
Getsolartermnum (year, solartermsenum. Lidong. Name (). append (", 11:"). append (
Getsolartermnum (year, solartermsenum. Xiaoxue. Name (). append (", 12:"). append (
Getsolartermnum (year, solartermsenum. DAXUE. Name (). append (", 12:"). append (
Getsolartermnum (year, solartermsenum. Dongzhi. Name (). append (", 1:"). append (
Getsolartermnum (year, solartermsenum. Xiaohan. Name (). append (", 1:"). append (
Getsolartermnum (year, solartermsenum. Dahan. Name ()));

Return sb. tostring ();
}

Public static int [] [] gensolartermsdays (){
Calendar Cal = calendar. getinstance ();
Int year = Cal. Get (calendar. year );
Return linear2twodimensional (solartermtostring (year). Split (","));
}

/**
* Convert an array into a two-dimensional array
*
* @ Param arr
* @ Return
*/
Public static int [] [] linear2twodimensional (string [] ARR ){
Int s [] [] = new int [arr. Length] []; // declare a two-dimensional array
For (INT I = 0; I <arr. length; I ++ ){
String [] sdate = arr [I]. Split (":");
Int [] idate = new int [sdate. Length];
For (Int J = 0; j <sdate. length; j ++ ){
Idate [J] = integer. valueof (sdate [J]. Trim ());
}
S [I] = idate;

}
Return S;
}

}