import java.util.*;Calendar cal=Calendar.getInstance();
cal.setTime(new Date());
cal.set(Calendar.DAY_OF_YEAR,cal.get(Calendar.DAY_OF_YEAR)-30);
cal.setTime(new Date());
cal.set(Calendar.DAY_OF_YEAR,cal.get(Calendar.DAY_OF_YEAR)-30);
cal.setTimeInMillis(new Date(System.currentTimeMillis())-30*24*60*60);怎么样有创新精神吧!
1"clearData.java": Error #: 375 : operator - cannot be applied to (java.util.Date, int)
2"clearData.java": Error #: 306 : method setTimeInMillis(long) has protected access in class java.util.Calendar