题目7 Day of Week

import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main{
    public static void main(String[]args){
        Map<String, Integer> Month2Int=new HashMap<String, Integer>();
        Month2Int.put("January", 1);
        Month2Int.put("February", 2);
        Month2Int.put("March", 3);
        Month2Int.put("April", 4);
        Month2Int.put("May", 5);
        Month2Int.put("June", 6);
        Month2Int.put("July", 7);
        Month2Int.put("August", 8);
        Month2Int.put("September", 9);
        Month2Int.put("October", 10);
        Month2Int.put("November", 11);
        Month2Int.put("December", 12);
        Map<Integer, String> int2Week=new HashMap<Integer, String>();
        int2Week.put(1, "Sunday");
        int2Week.put(2, "Monday");
        int2Week.put(3, "Tuesday");
        int2Week.put(4, "Wednesday");
        int2Week.put(5, "Thursday");
        int2Week.put(6, "Friday");
        int2Week.put(7, "Saturday");
        
        Date t=new Date();
        t.year=0;
        t.month=1;
        t.day=1;
        int count=0;
        while(t.year!=3001){
            buf[t.year][t.month][t.day]=count;
            t.nextDate();
            count++;
        }
        
        Scanner in=new Scanner(System.in);
        while(in.hasNext()){
            int day=in.nextInt();
            String month=in.next();
            int year=in.nextInt();
            int month_=Month2Int.get(month);
            
            int x1=buf[year][month_][day];
            int x2=buf[2015][9][9];
            int c=x1-x2+3;
            c=(c%7+7)%7;
            c++;
            System.out.println(int2Week.get(c));
        }
     }
    private static int isYeap(int x){
        if(x%4==0&&x%100!=0||x%400==0) return 1;
        else return 0;
    }
    private static int[][]dayOfMonth={
            {0,0},
            {31,31},
            {28,29},
            {31,31},
            {30,30},
            {31,31},
            {30,30},
            {31,31},
            {31,31},
            {30,30},
            {31,31},
            {30,30},
            {31,31}
    };
    private static class Date{
        int year;
        int month;
        int day;
        void nextDate(){
            day++;
            if(day>dayOfMonth[month][isYeap(year)]){
                day=1;
                month++;
            }
            if(month>12){
                month=1;
                year++;
            }
        }
    }
    private static int[][][]buf=new int[3001][13][32];
}