调用不正确。。没理由啊

Question

s啊。。getTime()...........public int getDays(Date b,Date a) 
{ 
return (a.getTime()-b.getTime())/(3600*24*1000) 
}

Answer 1

出什么错？
参考这个            
Date d3,d1;(前提是这两个date必须有值)
long diff=d3.getTime()-d1.getTime();
long day=diff/(24*60*60*1000);
long hour=(diff/(60*60*1000)-day*24);
long min=((diff/(60*1000))-day*24*60-hour*60);
long s=(diff/1000-day*24*60*60-hour*60*60-min*60);
String different=""+day+"天"+hour+"小时"+min+"分"+s+"秒";