我是一个jsp初学者，我的jsp代码在运行时出现下面错误：
C:\Tomcat5.0\work\Catalina\localhost\_\org\apache\jsp\calendar_jsp.java:71: cann
ot resolve symbol
symbol  : method valueof (int)
location: class java.lang.String
  year=String.valueof(thisMonth.get(Calendar.YEAR));
             ^
C:\Tomcat5.0\work\Catalina\localhost\_\org\apache\jsp\calendar_jsp.java:72: cann
ot resolve symbol
symbol  : method valueof (int)
location: class java.lang.String
  month=String.valueof(thisMonth.get(Calendar.MONTH));
              ^
C:\Tomcat5.0\work\Catalina\localhost\_\org\apache\jsp\calendar_jsp.java:73: cann
ot resolve symbol
symbol  : method setFirstDayofWeek (int)
location: class java.util.Calendar
  thisMonth.setFirstDayofWeek(Calendar.SUNDAY);
           ^
C:\Tomcat5.0\work\Catalina\localhost\_\org\apache\jsp\calendar_jsp.java:76: cann
ot resolve symbol
symbol  : method getActualMaxinum (int)
location: class java.util.Calendar
  int maxIndex=thisMonth.getActualMaxinum(Calendar.DAY_OF_MONTH);
                        ^
4 errors
请问是什么问题？

用import的那个类

String 没有valueof这个方法。

再次感谢各位！Thank you!