public static void main(String[] args) {
int d, n, y, t, x, e, a;
Scanner input = new Scanner(System.in);
System.out.print("\n请选择年份： ");
n = input.nextInt();
System.out.print("\n请选择月份： ");
y = input.nextInt();
System.out.println();
System.out.print("\n请选择日： ");
t = input.nextInt();
System.out.println();
//判断平年还是闰年
d = n + (n - 1) / 4 - (n - 1) / 100 + (n - 1) / 400;
if (n % 4 == 0)
a = 28;//平年 28天
else
a = 29;//闰年29天
//累计天数
switch (y) {
case 1:
x = t - 1;
break;
case 2:
x = t + 30;
break;
case 3:
x = a + t + 30;
break;
case 4:
x = a + t + 31 + 30;
break;
case 5:
x = a + t + 31 + 30 + 30;
break;
case 6:
x = a + t + 31 + 30 + 31 + 30;
break;
case 7:
x = a + t + 31 + 30 + 31 + 30 + 30;
break;
case 8:
x = a + t + 31 + 30 + 31 + 30 + 30 + 31;
break;
case 9:
x = a + t + 31 + 30 + 31 + 30 + 30 + 31 + 31;
break;
case 10:
x = a + t + 31 + 30 + 31 + 30 + 30 + 31 + 31 + 30;
break;
case 11:
x = a + t + 31 + 30 + 31 + 30 + 30 + 31 + 31 + 30 + 31;
break;
case 12:
x = a + t + 31 + 30 + 31 + 30 + 30 + 31 + 31 + 30 + 30 + 31;
break;
default:
x = 0;
break;
}
//计算星期几
e = (d + x) % 7;
if (e == 0)//能整除 表示星期天
System.out.println("今天是星期天");
if (!(e == 0))//不能整除 表示星期 1 到 6
System.out.println("这天是星期" + (e + 1));
}