几年来Java中日期的差异

Question

Date currentDate=new Date();
DateFormat formatter=new SimpleDateFormat("dd-MM-yyyy");; 
Date date =(Date)formatter.parse(birthDate);     //birthDate is a String, in format dd-MM-yyyy
long diff = currentDate.getTime() - date.getTime();
long d=(1000*60*60*24*365);
long years = Math.round(diff / d);
age=(int) years;

年龄的价值没有正确回归.我究竟做错了什么？

Enter your birthdate: (in format dd-MM-yyyy)
25-07-1992
Current Date: Tue Apr 21 14:05:19 IST 2015
Birthday: Sat Jul 25 00:00:00 IST 1992

Output: Age is: 487

Answer 1

如果你写long d=(1000*60*60*24*365);,结果1000*60*60*24*365将被计算为int,而这对于int类型来说太大了.你应该1000l*60*60*24*365用来计算这个.