Algorithm Note _154: Algorithm improves date calculation (Java)

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1 Problem Description

2 Solutions

  1 problem description Problem Descriptionknown November 11, 2011 is Friday, ask yyyy mm month DD Day is the days of the week? Note Consider the case of a leap year. In particular, every hundred years do not leap, the 400-year leap in the situation. Input FormatEnter only one row
YYYY MM DDoutput Formatoutput has only one row
Wdata size and conventions1599 <= YYYY <= 2999
1 <= MM <=
1 <= DD <= 31, and ensure that the test sample yyyy mm month DD Day is a reasonable date
1 <= W <= 7, respectively, representing Monday to SundaySample Input one by oneSample Output5

2 Solutions

The specific code is as follows:

ImportJava.util.Scanner; Public classMain { Public BooleanJudgeyear (intYear ) {        if(Year% 400 = = 0 | | (year% 4 = = 0 && Year% 100! = 0))            return true;//This is a leap year        return false;//This is common year    }         Public intGetMonth (intYearintMonth) {//get the number of months        if(Month = = 1 | | month = = 3 | | month = = 5 | | month = = 7 | |Month= = 8 | | Month = = 10 | | month = = 12)            return31; if(Month = = 4 | | month = = 6 | | month = = 9 | | month = = 11)            return30; if(Judgeyear (year) && month = = 2)            return29; if(!judgeyear (year) && month = = 2)            return28; return0; }         Public voidGetResult (String date) {string[] temp= Date.split (""); intYear = integer.valueof (temp[0]); intmonth = integer.valueof (temp[1]); intDay = integer.valueof (temp[2]); intCountday = 0; intresult = 0;//Final Result        if(Year > 2011) {             for(inti = 1;i < month;i++) Countday+=GetMonth (year, i); Countday+=Day ;  for(inti = year-1;i > 2011;i--) {//when jumping out of the loop i =                if(Judgeyear (i)) Countday+ = 366; ElseCountday+ = 365; } countday= Countday + 19 + 31;//plus November 2011 remaining days and December 31 daysresult = 5 + countday% 7; if(Result! = 7) Result= result% 7; } Else if(Year < 2011) {Countday= Countday + (GetMonth (year, month)-Day ); Month++;  for(; month <= 12;month++) Countday+=GetMonth (year, month);  for(inti = year + 1;i < 2011;i++) {//when jumping out of the loop i =                if(Judgeyear (i)) Countday+ = 366; ElseCountday+ = 365; }             for(inti = 1;i <= 10;i++) Countday+ = GetMonth (2011, i); Countday+ = 11; Result= 5-countday% 7; if(Result = = 0) Result= 7; Else if(Result = =-1) Result= 6; Else if(Result = =-2) Result= 5; } Else if(Year = = 2011) {            if(Month > 11) {Countday= Countday + 19 +Day ; } Else if(Month = = 11) {                if(Day >= 11) {Countday= day-11; } Else if(Day < 11) Countday= 11-Day ; } Else if(Month < 11) {Countday+ = GetMonth (, month)-Day ; inti = month + 1;  for(; I <= 10;i++) Countday+ = GetMonth (2011, i); Countday+ = 11; }            if(Month >= && Day >= 11) {result= 5 + countday% 7; if(Result! = 7) Result= result% 7; } Else{result= 5-countday% 7; if(Result = = 0) Result= 7; Else if(Result = =-1) Result= 6; Else if(Result = =-2) Result= 5;    }} System.out.println (Result); }         Public Static voidMain (string[] args) {main test=NewMain (); Scanner in=NewScanner (system.in); String Date=In.nextline ();    Test.getresult (date); }}

Algorithm Note _154: Algorithm improves date calculation (Java)