JAVA中计算两个时间相差多少 天，时，分，秒

import java.util.Date;

public class ShowTimeInterval{
    public void ShowTimeInterval(Date date1, Date date2) {
    long lDate1 = date1.getTime();
    long lDate2 = date2.getTime();
    long diff = (lDate1 < lDate2) ? (lDate2 - lDate1) : (lDate1 - lDate2);
      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 sec = diff / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60;
    System.out.println("date1 与 date2 相差 " + day + "天" + hour + "小时" + min + "分" + sec + "秒");
    }
}