Date d;
Calendar calendar=Calendar.getInstance();
calendar.setTime(d);
calendar.add(Calendar.Date,-10);
Date d2=calendar.getTime();
Calendar calendar=Calendar.getInstance();
calendar.setTime(d);
calendar.add(Calendar.Date,-10);
Date d2=calendar.getTime();
Date d = f1.parse(s);
Date d= formatter.parse(date);Calendar.Date改为 Calendar.DATE
java.lang.NullPointerException
at java.util.Calendar.setTime(Calendar.java(Compiled Code))