JAVA計(jì)時(shí)算法

你可以在開(kāi)始和結(jié)束的時(shí)候，分別記錄下當(dāng)前的時(shí)間的這毫秒數(shù)。然后再減，以下是一段代碼。

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public

class

Test{

public

static

void

main(String[]

args)

{

long

startMili=System.currentTimeMillis();//

當(dāng)前時(shí)間對(duì)應(yīng)的毫秒數(shù)

System.out.println("開(kāi)始

"+startMili);

//

執(zhí)行一段代碼,求一百萬(wàn)次隨機(jī)值

for(int

i=0;i1000000;i++){

Math.random();

}

long

endMili=System.currentTimeMillis();

System.out.println("結(jié)束

s"+endMili);

System.out.println("總耗時(shí)為："+(endMili-startMili)+"毫秒");

}

}

java計(jì)算時(shí)間

可以這么寫(xiě)：

public?static?void?compute()?{

Scanner?scanner?=?new?Scanner(System.in);

int?time1,?time2,?hours,?minutes;

time1?=?scanner.nextInt();

time2?=?scanner.nextInt();

String?t1?=?String.valueOf(time1);

String?t2?=?String.valueOf(time2);

//開(kāi)始時(shí)間的小時(shí)

int?t1_hour?=?Integer.parseInt(t1.substring(0,?t1.length()-2));

//結(jié)束時(shí)間的小時(shí)

int?t2_hour?=?Integer.parseInt(t2.substring(0,?t2.length()?-?2));

//開(kāi)始時(shí)間的分鐘

int?t1_minute?=?Integer.parseInt(t1.substring(t1.length()-2));

//結(jié)束時(shí)間的分鐘

int?t2_minute?=?Integer.parseInt(t2.substring(t2.length()?-?2));

//時(shí)間差的小時(shí)

hours?=((t2_hour?*?60?+?t2_minute)-?(t1_hour?*?60?+?t1_minute))/60;

//時(shí)間差的分鐘

minutes?=((t2_hour?*?60?+?t2_minute)-?(t1_hour?*?60?+?t1_minute))%60;

System.out.println("The?train?journey?time?is?"+hours+"?hrs?"+?minutes+"?mins.");

scanner.close();

}

JAVA 時(shí)間計(jì)算

如果今天是2011年1月5日，先引入import java.util.Date;import java.text.SimpleDateFormat;

Date time=new Date();

Calendar cal=Calendar.getInstance();

cal.setTime(time);//日歷為今天

long tm,tm1;

tm=cal.getTimeInMillis();//得到當(dāng)前時(shí)間與1970年1月1日0點(diǎn)相距的毫秒數(shù)

tm1=tm-(24*60*60*1000);//得到昨天與1970年1月1日0點(diǎn)相距的毫秒數(shù)

Date time1=new Date(tm1);

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

String tm=sdf.format(time1);//tm就是昨天的日期的字符串表示

java整么計(jì)算時(shí)間

提供一個(gè)時(shí)間操作類(lèi)給你，你可以調(diào)用里面的dateDiff方法，dateDiff（new Date(), getDateFromString("明天的字符串"）表示的就是現(xiàn)在到明天0點(diǎn)之前的差距天數(shù)。

你要分鐘數(shù)的話就自己改一下dateDiff，不要除以60和24就是分鐘了

以下是工具類(lèi)代碼

import?org.apache.log4j.Logger;

import?java.text.ParseException;

import?java.text.SimpleDateFormat;

import?java.util.Calendar;

import?java.util.Date;

public?class?AdDateUtil?{

private?static?Logger?logger?=?Logger.getLogger(AdDateUtil.class);

static?public?String?getNowStr(String?format)?{

SimpleDateFormat?sdf?=?new?SimpleDateFormat(format);

String?now?=?sdf.format(new?Date());

return?now;

}

static?public?Date?getFormatDate(String?date,?String?format)?{

SimpleDateFormat?sdf?=?new?SimpleDateFormat(format);

Date?d?=?new?Date();

try?{

d?=?sdf.parse(date);

}?catch?(ParseException?e)?{

logger.error(e);

}

return?d;

}

static?public?String?getDateStr(Date?date,?String?format)?{

SimpleDateFormat?sdf?=?new?SimpleDateFormat(format);

String?d?=?sdf.format(date);

return?d;

}

static?public?String?getPadZeroString(String?s,?int?size)?{

StringBuffer?sb?=?new?StringBuffer();

for?(int?i?=?0;?i??(size?-?s.length());?i++)?{

sb.append("0");

}

sb.append(s);

return?sb.toString();

}

/**

*?得到某月的天數(shù)

*

*?@param?year

*?@param?month

*?@return

*/

static?public?int?getDayCountOfMonth(String?year,?String?month)?{

Calendar?cal?=?Calendar.getInstance();

//?年

cal.set(Calendar.YEAR,?Integer.parseInt(year));

//?月，因?yàn)镃alendar里的月是從0開(kāi)始，所以要-1

cal.set(Calendar.MONTH,?Integer.parseInt(month)?-?1);

return?cal.getActualMaximum(Calendar.DAY_OF_MONTH);

}

static?public?String?getYesterday(String?format)?{

SimpleDateFormat?df?=?new?SimpleDateFormat(format);

Calendar?now?=?Calendar.getInstance();

now.roll(Calendar.DAY_OF_YEAR,?-1);?//昨天

return?df.format(now.getTime());

}

/**

*?獲取和今天附近的某天

*?@param?format

*?@param?diff

*?@return

*/

static?public?String?getADay(String?format,?int?diff)?{

SimpleDateFormat?df?=?new?SimpleDateFormat(format);

Calendar?now?=?Calendar.getInstance();

int?beforeM?=?now.get(Calendar.MONTH);

now.roll(Calendar.DAY_OF_YEAR,?diff);?//

int?nowM?=?now.get(Calendar.MONTH);

//必須進(jìn)行日期處理，否則2009-01-04日前七天是2009-12-28

if?(nowM??beforeM)?{

now.roll(Calendar.YEAR,?-1);

}

return?df.format(now.getTime());

}

static?public?String?getTomorrow(String?format)?{

SimpleDateFormat?df?=?new?SimpleDateFormat(format);

Calendar?now?=?Calendar.getInstance();

now.roll(Calendar.DAY_OF_YEAR,?1);?//明天

return?df.format(now.getTime());

}

/**

*?得到最近num天的全部日期

*?說(shuō)明:

*?1.日期是從昨天開(kāi)始算的.

*?2.如果num=2?,?日期是2008-03-14?,則返回的結(jié)果為?2008-03-12、2008-03-13

*?@param?num

*?@return

*/

public?static?String[]?getDaysByNum(int?num,?String?date)?{

SimpleDateFormat?sdf?=?new?SimpleDateFormat("yyyy-MM-dd");

String[]?result?=?{??};

Calendar?cal?=?Calendar.getInstance();

cal.setTime(getDateFromString(date,?"yyyy-MM-dd"));

//最近一周

result?=?new?String[num];

for?(int?i?=?num;?i??0;?i--)?{

cal.add(Calendar.DAY_OF_YEAR,?-1);

result[i?-?1]?=?sdf.format(new?Date(cal.getTimeInMillis()));

}

return?result;

}

public?static?Date?getDateFromString(String?dateStr,?String?format)?{

if?((dateStr?==?null)?||?(format?==?null))?{

try?{

throw?new?Exception("數(shù)據(jù)類(lèi)型異常"?+?dateStr?+?"|"?+?format);

}?catch?(Exception?e)?{

logger.error("數(shù)據(jù)類(lèi)型異常:"?+?e);

}

}

SimpleDateFormat?df?=?new?SimpleDateFormat(format);

Date?date;

try?{

date?=?df.parse(dateStr);

return?date;

}?catch?(Exception?ex)?{

logger.error(ex);

return?new?Date();

}

}

static?public?int?getNowYear()?{

Calendar?cal?=?Calendar.getInstance();

return?cal.get(Calendar.YEAR);

}

static?public?int?getNowMonth()?{

Calendar?cal?=?Calendar.getInstance();

return?cal.get(Calendar.MONTH)?+?1;

}

public?static?String[]?getMonthRang(String?year,?String?month)?{

String?beginDate?=?year?+?"-"?+?month?+?"-01";

String?endDate?=?year?+?"-"?+?month?+?"-"?+

getDayCountOfMonth(year,?month);

return?getDaysByRang(beginDate,?endDate);

}

public?static?String[]?getDaysByRang(String?beginDate,?String?endDate)?{

SimpleDateFormat?sdf?=?new?SimpleDateFormat("yyyy-MM-dd");

//得到兩個(gè)日期間相差多少天

int?num?=?dateDiff(beginDate,?endDate);

if?(num??0)?{

//顛倒一下日期

String?tmp?=?beginDate;

beginDate?=?endDate;

endDate?=?tmp;

num?=?0?-?num;

}

String[]?result?=?{??};

Calendar?cal?=?Calendar.getInstance();

try?{

cal.setTime(sdf.parse(beginDate));

}?catch?(ParseException?e)?{

e.printStackTrace();

}

num?=?num?+?1;?//把開(kāi)始和結(jié)束日期都包含進(jìn)去

result?=?new?String[num];

for?(int?i?=?0;?i??num;?i++)?{

if?(i??0)?{

cal.add(Calendar.DAY_OF_YEAR,?1);

}

result[i]?=?sdf.format(new?Date(cal.getTimeInMillis()));

}

return?result;

}

public?static?int?dateDiff(String?beginDate,?String?endDate)?{

SimpleDateFormat?sdf?=?new?SimpleDateFormat("yyyy-MM-dd");

Date?date?=?null;

try?{

date?=?sdf.parse(endDate);

}?catch?(ParseException?e)?{

date?=?new?Date();

e.printStackTrace();

}

long?end?=?date.getTime();

try?{

date?=?sdf.parse(beginDate);

}?catch?(ParseException?e)?{

date?=?new?Date();

e.printStackTrace();

}

long?begin?=?date.getTime();

long?day?=?(end?-?begin)?/?(1000?*?3600?*?24);?//除1000是把毫秒變成秒

return?Integer.parseInt(Long.toString(day));

}

public?static?void?main(String[]?args)?{

System.out.println(AdDateUtil.getADay("yyyy-MM-dd",?-7));

}

}

文章標(biāo)題：java計(jì)算算法時(shí)間代碼,Java計(jì)算時(shí)間間隔
標(biāo)題URL：http://sd-ha.com/article40/hdhieo.html

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