java计算两个日期之间的时间间隔

public int getDateDays ( String end, String begin )
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyymmdd");
long betweenTime =0;
try
{
Date date = sdf.parse(end);// 通过日期格式的parse()方法将字符串转换成日期
Date dateBegin = sdf.parse(begin);
betweenTime = date.getTime() - dateBegin.getTime();
betweenTime = betweenTime / 1000 / 60 / 60 / 24;
}
catch (Exception e)
{
}
return (int)betweenTime;
}