内存堆与栈的区别

/**
* 计算两个日期的时间差
* @param formatTime1
* @param formatTime2
* @return
*/
public static String getTimeDifference(Timestamp formatTime1, Timestamp formatTime2) {
SimpleDateFormat timeformat = new SimpleDateFormat("yyyy-MM-dd,HH:mm:ss");
long t1 = 0L;
long t2 = 0L;
try {
t1 = timeformat.parse(getTimeStampNumberFormat(formatTime1)).getTime();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
t2 = timeformat.parse(getTimeStampNumberFormat(formatTime2)).getTime();
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//因为t1-t2得到的是毫秒级,所以要初3600000得出小时.算天数或秒同理
int hours=(int) ((t1 - t2)/3600000);
int minutes=(int) (((t1 - t2)/1000-hours*3600)/60);
int second=(int) ((t1 - t2)/1000-hours*3600-minutes*60);
return ""+hours+"小时"+minutes+"分"+second+"秒";
}
/**
* 格式化时间
* Locale是设置语言敏感操作
* @param formatTime
* @return
*/
public static String getTimeStampNumberFormat(Timestamp formatTime) {
SimpleDateFormat m_format = new SimpleDateFormat("yyyy-MM-dd,HH:mm:ss", new Locale("zh", "cn"));
return m_format.format(formatTime);
}