代码：Scanner sc=new Scanner(System.in);
System.out.println("请输入一个年份");
int year=sc.nextInt();
System.out.println("请输入一个月份");
int month=sc.nextInt();
int monthDay=0;
boolean b=true;
if((year%4==0&&year%100!=0)||(year%400==0))
{
System.out.println(year+"是瑞年");
}
else
{
System.out.println(year+"不是瑞年");
b=false;
}
switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:monthDay=31;break;
case 4:
case 6:
case 9:
case 11:monthDay=30;break;
case 2:if(b=true)
{
monthDay=29;
}
else{
monthDay=28;
}
}
System.out.println(year+"年的"+month+"月是"+monthDay+"天");
}
}