VMware coding Challenge：Date of Weekday

这道题再次证明了这种细节的题目，画个图容易搞清楚

import java.util.Scanner;


public class Solution2 {
    static int DateOfWeekday(int date, int weekday) {
        int cur = date%7;
        int res = 0;
        int dif = 0;
        if (weekday > 0) {
            dif = 7*((weekday-1)/7) + (weekday%7-cur>0? weekday%7-cur : 7-(cur-weekday%7));
            res = date + dif;
        }
        else if (weekday < 0){
            weekday = Math.abs(weekday);
            dif = 7*((weekday-1)/7) + (cur-weekday%7>0? cur-weekday%7 : 7-(weekday%7-cur));
            res = date - dif;
        }
        else res = date;
        return res;
    }
    
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int res;
        int _date;
        _date = Integer.parseInt(in.nextLine());
        
        int _weekday;
        _weekday = Integer.parseInt(in.nextLine());
        
        res = DateOfWeekday(_date, _weekday);
        System.out.println(res);
    }

}

    static int DateOfWeekday(int date, int weekday) {
        int cur = date % 7;
        int res;
        if (weekday == 0) return date;
        else if (weekday > 0) { 
            if (weekday % 7 > cur) res = date + weekday % 7 - cur;
            else res = date + 7 - (cur - weekday % 7);
            res = res + 7*((weekday-1)/7);
        }
        else {
            if (Math.abs(weekday % 7)<cur) res= date - cur - weekday % 7;
            else res = date - 7 - cur - weekday%7;
            res = res - 7*((Math.abs(weekday)-1)/7);
        }
        return res;
    }