题解 | #计算日期到天数转换#

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

/**
 * 【计算日期到天数转换】
 *
 */
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int year = sc.nextInt();
        int month = sc.nextInt();
        int day = sc.nextInt();

        boolean runYear = isRunYear(year);
        List<Integer> integerList = Arrays.asList(1, 3, 5, 7, 8, 10, 12);

        int count = 0;
        for (int i = 1; i < month; i++) {
            if (integerList.contains(i)) {
                count = count + 31;
            } else if (i == 2) {
                count = runYear? count + 29 : count + 28;
            } else {
                count = count + 30;
            }
        }

        System.out.println(count + day);
    }

    /**
     * 是否闰年
     *
     * 判断依据: 能够整除4并且不能整除100；或者能够整除400
     *
     * @param year
     * @return
     */
    public static boolean isRunYear(int year) {
        if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
            return true;
        }
        return false;
    }
}