Java日期时间以及日期相互转换
Java日期时间,以及相互转化,供大家参考,具体内容如下
packagecom.study.string; importjava.text.ParseException; importjava.text.SimpleDateFormat; importjava.util.Calendar; importjava.util.Date; importjava.util.GregorianCalendar; publicclassDateBase{ publicstaticvoidmain(String[]args)throwsParseException{ /* *获得当前时间 */ Datedate1=newDate(); longlong1=date1.getTime();//date类型,转为long类型 System.out.println(date1);//SatAug2608:36:36GMT+08:002017 System.out.println(long1);//1503708031359 Calendarcale1=Calendar.getInstance(); date1=cale1.getTime();//calendar类型转为date类型 long1=date1.getTime(); System.out.println(cale1); System.out.println(date1);//SatAug2608:36:36GMT+08:002017 System.out.println(long1); /* *设置时间 */ long1+=24*60*60*1000; date1.setTime(long1); System.out.println(date1);//SunAug2708:43:26GMT+08:002017 /* *格式化时间日期,无参数的默认格式,有参数的自定义格式。 *Date->String用format() *String->Date用parse() */ SimpleDateFormatsim1=newSimpleDateFormat();//默认格式:17-8-27上午8:45 Stringtime1=sim1.format(date1); System.out.println(time1);//17-8-27上午8:45 Datedate11=sim1.parse(time1); System.out.println(date11); SimpleDateFormatsim2=newSimpleDateFormat("yyyy-MM-ddHH:mm:sssss"); Stringtime2=sim2.format(date1); System.out.println(time2);//2017-08-2708:47:58058 Datedate22=sim2.parse(time2); System.out.println(date22);//SunAug2708:52:08GMT+08:002017 /* *创建指定日期String *GregorianCalendar */ SimpleDateFormatsim3=newSimpleDateFormat("yyyy-MM-dd"); Stringstr1="2014-09-27"; Datedate33=sim3.parse(str1); System.out.println(date33);//SatSep2700:00:00GMT+08:002014 GregorianCalendargre1=newGregorianCalendar(2015,Calendar.DECEMBER,25); Datedate44=gre1.getTime(); System.out.println(date44);//FriDec2500:00:00GMT+08:002015 Calendarcal2=Calendar.getInstance(); cal2.set(Calendar.YEAR,2017); cal2.set(Calendar.MONTH,7);//月份的数字与第几个月差1,8==Calendar.SEPTEMBER cal2.set(Calendar.DATE,26);//TueSep0909:04:25GMT+08:002008 //cal2.set(Calendar.DAY_OF_MONTH,12); System.out.println(cal2.getTime());//SatAug2609:09:44GMT+08:002017 /* *获取年月日,星期,时间 */ intdayOfweek=cal2.get(Calendar.DAY_OF_WEEK); System.out.println(dayOfweek);//7是星期六 /* *Calendar的时间加减 */ Calendarcal3=Calendar.getInstance(); cal3.add(Calendar.YEAR,1); cal3.add(Calendar.MONTH,-2); System.out.println(cal3.getTime());//TueJun2609:14:11GMT+08:002018 /* * */ Calendarcal4=Calendar.getInstance(); cal4.set(Calendar.YEAR,2016); cal4.set(Calendar.DATE,1); //每个月的最后一天 for(intmonth=Calendar.JANUARY;month以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持毛票票。