求解这个哪里有问题
import java.util.Calendar;
public class Demo1 {
String weekData="";
Calendar calendar = Calendar.getInstance();
int week = calendar.get(Calendar.DAY_OF_WEEK)-1;
switch (week) {
case 0:
weekDate = "星期日";
break;
case 1:
weekDate = "星期一";
break;
case 2:
weekDate = "星期二";
break;
case 3:
weekDate = "星期三";
break;
case 4:
weekDate = "星期四";
break;
case 5:
weekDate = "星期五";
break;
case 6:
weekDate = "星期六";
break;
}
System.out.println("今天是 " + weekDate);
}
}
```!