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zljerityzljerity:
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freeMark全解 -
qiankai86:
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freeMark全解
给自己的一些工具类关于时间的判断和空对象判断
/* * Created on 2009-9-17 * * @author Peter_Ke */ package com.peter.apps.eshidx.util; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Collection; import java.util.Date; import java.util.Iterator; import java.util.List; import java.util.Map; /** * @author Peter_Ke * hleper classes * call me if you want to change the code * Created on 2009-9-17 */ public class miscUtil { public static java.util.Date toDate(String dateTime) { // dateTime must have one space between the date and time... String date = dateTime.substring(0, dateTime.indexOf(" ")); String time = dateTime.substring(dateTime.indexOf(" ") + 1); return toDate(date, time); } public static java.util.Date toDate(String date, String time) { if (date == null || time == null) return null; String month; String day; String year; String hour; String minute; String second; int dateSlash1 = date.indexOf("-"); int dateSlash2 = date.lastIndexOf("-"); if (dateSlash1 <= 0 || dateSlash1 == dateSlash2) return null; int timeColon1 = time.indexOf(":"); int timeColon2 = time.lastIndexOf(":"); int ms_index = time.lastIndexOf("."); if (timeColon1 <= 0) return null; year = date.substring(0, dateSlash1); month = date.substring(dateSlash1 + 1, dateSlash2); day = date.substring(dateSlash2 + 1); hour = time.substring(0, timeColon1); if (timeColon1 == timeColon2) { minute = time.substring(timeColon1 + 1); second = "0"; } else { minute = time.substring(timeColon1 + 1, timeColon2); if(ms_index<0) second = time.substring(timeColon2 + 1); else second = time.substring(timeColon2 + 1 , ms_index) ; } return toDate(month, day, year, hour, minute, second); } public static java.util.Date toDate(int month, int day, int year, int hour, int minute, int second) { Calendar calendar = Calendar.getInstance(); try { calendar.set(year, month - 1, day, hour, minute, second); } catch (Exception e) { return null; } return new java.util.Date(calendar.getTime().getTime()); } public static java.util.Date toDate(String monthStr, String dayStr, String yearStr, String hourStr, String minuteStr, String secondStr) { int month, day, year, hour, minute, second; try { month = Integer.parseInt(monthStr); day = Integer.parseInt(dayStr); year = Integer.parseInt(yearStr); hour = Integer.parseInt(hourStr); minute = Integer.parseInt(minuteStr); second = Integer.parseInt(secondStr); } catch (Exception e) { return null; } return toDate(month, day, year, hour, minute, second); } public static long compareTo(Date start,Date end){ //return -N , 0 , N for compart two Date return (start.getTime() - end.getTime() )/(1000*60*60*24); } public static String getDateBegin(String date){ return date+" 00:00:00"; } public static String getDateEnd(String date){ return date+" 23:59:59"; } public static Date getMonthStart(Date datePatter) { Calendar _cal = Calendar.getInstance(); _cal.setTime(datePatter); _cal.set(Calendar.DAY_OF_MONTH, 1); return _cal.getTime(); } public static Date getMonthEnd(Date datePatter) { Calendar _cal = Calendar.getInstance(); _cal.setTime(datePatter); _cal.set(Calendar.DAY_OF_MONTH, _cal.getActualMaximum(Calendar.DAY_OF_MONTH)); return _cal.getTime(); } public static void printSimpleMap(Map map){ for (Iterator iter = map.entrySet().iterator(); iter.hasNext();) { Map.Entry element = (Map.Entry) iter.next(); Object key = element.getKey(); Object value = element.getValue(); System.out.println("key=value: "+key+"="+value); } } public static Date combineDateWithTimeString(Date date,String time){ if (date==null||time==null||time.length()==0){ System.out.println("error of null input in combineDate"); return null; } if (time.indexOf(':')<0){ System.out.println("error of time input format in combineDate"); return null; } String[] timeSplit = time.split(":"); String hour = (String)timeSplit[0]; String minute = (String)timeSplit[1]; Integer h=Integer.valueOf(hour); Integer min=Integer.valueOf(minute); Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.set(Calendar.HOUR_OF_DAY,h.intValue()); calendar.set(Calendar.MINUTE,min.intValue()); Date result = new Date(calendar.getTimeInMillis()); return result; } public static List getYearList(){ List yearList = new ArrayList(); Calendar cal = Calendar.getInstance(); cal.setTime(new Date()); cal.add(Calendar.MARCH,-1); Date today = cal.getTime(); yearList.add(new Integer(today.getYear()+1900)); cal.setTime(new Date(102,0,1)); while(cal.getTime().getYear()<today.getYear()){ yearList.add(new Integer(cal.getTime().getYear()+1900)); cal.add(Calendar.YEAR,1); } return yearList; } public static List getMonthList(){ List monthList = new ArrayList(); int month; Date today = new Date(); if(today.getMonth()==0){ month=12; }else{ month = today.getMonth(); } monthList.add(new Integer(month)); for (int i = 1; i <= 12; i++) { if(i!=month){ monthList.add(new Integer(i)); } } return monthList; } public static int getCurrentMonth(){ Calendar c = Calendar.getInstance(); int month = c.get(Calendar.MONTH)+1; return month; } public static int getLastMonth(){ Calendar c = Calendar.getInstance(); int month = c.get(Calendar.MONTH); if(month==0){ month=12; } return month; } public static int getCurrentYear(){ Calendar c = Calendar.getInstance(); int year = c.get(Calendar.YEAR); return year; } public static int getLastYear(){ return getCurrentYear()-1; } public static boolean isEmpty(Map map){ return (map == null||map.isEmpty()); } public static boolean isEmpty(String str){ return ((str == null)||(str.trim().length() == 0)); } public static boolean isEmpty(Collection c){ return ((c == null)||(c.size() == 0)); } public static boolean isEmpty(Object[] a){ return ((a == null)||(a.length == 0)); } }
再来个全的time util
/* * $Id: UtilDateTime.java,v 1.1 2009/04/28 06:38:23 Exp $ * * Copyright (c) 2001 The Open For Business Project - www.ofbiz.org * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package com.peter.apps.util; import java.util.*; import java.text.*; /** * Utility class for handling java.util.Date, the java.sql data/time classes and related information * *@author <a href="mailto:jonesde@ofbiz.org">David E. Jones</a> *@author <a href="mailto:jaz@zsolv.com">Andy Zeneski</a> *@created May 21, 2001 *@version 1.1 */ public class UtilDateTime { /** Return a Timestamp for right now * @return Timestamp for right now */ public static java.sql.Timestamp nowTimestamp() { return new java.sql.Timestamp(System.currentTimeMillis()); } /** Return a Date for right now * @return Date for right now */ public static java.util.Date nowDate() { return new java.util.Date(); } /** * Return a string formatted as yyyyMMddHHmmss * @return String formatted for right now */ public static String nowDateString() { SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss"); return df.format(new Date()); } public static java.sql.Timestamp getDayStart(java.sql.Timestamp stamp) { return getDayStart(stamp, 0); } public static java.sql.Timestamp getDayStart(java.sql.Timestamp stamp, int daysLater) { Calendar tempCal = Calendar.getInstance(); tempCal.setTime(new java.util.Date(stamp.getTime())); tempCal.set(tempCal.get(Calendar.YEAR), tempCal.get(Calendar.MONTH), tempCal.get(Calendar.DAY_OF_MONTH), 0, 0, 0); tempCal.set(Calendar.MILLISECOND, 0); //if (daysLater > 0) tempCal.add(Calendar.DAY_OF_MONTH, daysLater); tempCal.add(Calendar.DAY_OF_MONTH, daysLater); return new java.sql.Timestamp(tempCal.getTime().getTime()); } public static java.sql.Timestamp getNextDayStart(java.sql.Timestamp stamp) { return getDayStart(stamp, 1); } public static java.sql.Timestamp getDayEnd(java.sql.Timestamp stamp) { return getDayEnd(stamp, 0); } public static java.sql.Timestamp getDayEnd(java.sql.Timestamp stamp, int daysLater) { Calendar tempCal = Calendar.getInstance(); tempCal.setTime(new java.util.Date(stamp.getTime())); tempCal.set(tempCal.get(Calendar.YEAR), tempCal.get(Calendar.MONTH), tempCal.get(Calendar.DAY_OF_MONTH), 23, 59, 59); tempCal.set(Calendar.MILLISECOND, 0); //if (daysLater > 0) tempCal.add(Calendar.DAY_OF_MONTH, daysLater); tempCal.add(Calendar.DAY_OF_MONTH, daysLater); return new java.sql.Timestamp(tempCal.getTime().getTime()); } /** Converts a date String into a java.sql.Date * @param date The date String: MM/DD/YYYY * @return A java.sql.Date made from the date String */ public static java.sql.Date toSqlDate(String date) { java.util.Date newDate = toDate(date, "00:00:00"); if (newDate != null) return new java.sql.Date(newDate.getTime()); else return null; } /** Makes a java.sql.Date from separate Strings for month, day, year * @param monthStr The month String * @param dayStr The day String * @param yearStr The year String * @return A java.sql.Date made from separate Strings for month, day, year */ public static java.sql.Date toSqlDate(String monthStr, String dayStr, String yearStr) { java.util.Date newDate = toDate(monthStr, dayStr, yearStr, "0", "0", "0"); if (newDate != null) return new java.sql.Date(newDate.getTime()); else return null; } /** Makes a java.sql.Date from separate ints for month, day, year * @param month The month int * @param day The day int * @param year The year int * @return A java.sql.Date made from separate ints for month, day, year */ public static java.sql.Date toSqlDate(int month, int day, int year) { java.util.Date newDate = toDate(month, day, year, 0, 0, 0); if (newDate != null) return new java.sql.Date(newDate.getTime()); else return null; } /** Converts a time String into a java.sql.Time * @param time The time String: either HH:MM or HH:MM:SS * @return A java.sql.Time made from the time String */ public static java.sql.Time toSqlTime(String time) { java.util.Date newDate = toDate("1/1/1970", time); if (newDate != null) return new java.sql.Time(newDate.getTime()); else return null; } /** Makes a java.sql.Time from separate Strings for hour, minute, and second. * @param hourStr The hour String * @param minuteStr The minute String * @param secondStr The second String * @return A java.sql.Time made from separate Strings for hour, minute, and second. */ public static java.sql.Time toSqlTime(String hourStr, String minuteStr, String secondStr) { java.util.Date newDate = toDate("0", "0", "0", hourStr, minuteStr, secondStr); if (newDate != null) return new java.sql.Time(newDate.getTime()); else return null; } /** Makes a java.sql.Time from separate ints for hour, minute, and second. * @param hour The hour int * @param minute The minute int * @param second The second int * @return A java.sql.Time made from separate ints for hour, minute, and second. */ public static java.sql.Time toSqlTime(int hour, int minute, int second) { java.util.Date newDate = toDate(0, 0, 0, hour, minute, second); if (newDate != null) return new java.sql.Time(newDate.getTime()); else return null; } /** Converts a date and time String into a Timestamp * @param dateTime A combined data and time string in the format "MM/DD/YYYY HH:MM:SS", the seconds are optional * @return The corresponding Timestamp */ public static java.sql.Timestamp toTimestamp(String dateTime) { java.util.Date newDate = toDate(dateTime); if (newDate != null) return new java.sql.Timestamp(newDate.getTime()); else return null; } /** Converts a date String and a time String into a Timestamp * @param date The date String: MM/DD/YYYY * @param time The time String: either HH:MM or HH:MM:SS * @return A Timestamp made from the date and time Strings */ public static java.sql.Timestamp toTimestamp(String date, String time) { java.util.Date newDate = toDate(date, time); if (newDate != null) return new java.sql.Timestamp(newDate.getTime()); else return null; } /** Makes a Timestamp from separate Strings for month, day, year, hour, minute, and second. * @param monthStr The month String * @param dayStr The day String * @param yearStr The year String * @param hourStr The hour String * @param minuteStr The minute String * @param secondStr The second String * @return A Timestamp made from separate Strings for month, day, year, hour, minute, and second. */ public static java.sql.Timestamp toTimestamp(String monthStr, String dayStr, String yearStr, String hourStr, String minuteStr, String secondStr) { java.util.Date newDate = toDate(monthStr, dayStr, yearStr, hourStr, minuteStr, secondStr); if (newDate != null) return new java.sql.Timestamp(newDate.getTime()); else return null; } /** Makes a Timestamp from separate ints for month, day, year, hour, minute, and second. * @param month The month int * @param day The day int * @param year The year int * @param hour The hour int * @param minute The minute int * @param second The second int * @return A Timestamp made from separate ints for month, day, year, hour, minute, and second. */ public static java.sql.Timestamp toTimestamp(int month, int day, int year, int hour, int minute, int second) { java.util.Date newDate = toDate(month, day, year, hour, minute, second); if (newDate != null) return new java.sql.Timestamp(newDate.getTime()); else return null; } /** Converts a date and time String into a Date * @param dateTime A combined data and time string in the format "MM/DD/YYYY HH:MM:SS", the seconds are optional * @return The corresponding Date */ public static java.util.Date toDate(String dateTime) { // dateTime must have one space between the date and time... String date = dateTime.substring(0, dateTime.indexOf(" ")); String time = dateTime.substring(dateTime.indexOf(" ") + 1); return toDate(date, time); } /** Converts a date String and a time String into a Date * @param date The date String: YYYY-MM-DD * @param time The time String: either HH:MM or HH:MM:SS or HH:MM:SS.s * @return A Date made from the date and time Strings */ public static java.util.Date toDate(String date, String time) { if (date == null || time == null) return null; String month; String day; String year; String hour; String minute; String second; int dateSlash1 = date.indexOf("-"); int dateSlash2 = date.lastIndexOf("-"); if (dateSlash1 <= 0 || dateSlash1 == dateSlash2) return null; int timeColon1 = time.indexOf(":"); int timeColon2 = time.lastIndexOf(":"); int ms_index = time.lastIndexOf("."); if (timeColon1 <= 0) return null; year = date.substring(0, dateSlash1); month = date.substring(dateSlash1 + 1, dateSlash2); day = date.substring(dateSlash2 + 1); hour = time.substring(0, timeColon1); if (timeColon1 == timeColon2) { minute = time.substring(timeColon1 + 1); second = "0"; } else { minute = time.substring(timeColon1 + 1, timeColon2); if(ms_index<0) second = time.substring(timeColon2 + 1); else second = time.substring(timeColon2 + 1 , ms_index) ; } return toDate(month, day, year, hour, minute, second); } /** Makes a Date from separate Strings for month, day, year, hour, minute, and second. * @param monthStr The month String * @param dayStr The day String * @param yearStr The year String * @param hourStr The hour String * @param minuteStr The minute String * @param secondStr The second String * @return A Date made from separate Strings for month, day, year, hour, minute, and second. */ public static java.util.Date toDate(String monthStr, String dayStr, String yearStr, String hourStr, String minuteStr, String secondStr) { int month, day, year, hour, minute, second; try { month = Integer.parseInt(monthStr); day = Integer.parseInt(dayStr); year = Integer.parseInt(yearStr); hour = Integer.parseInt(hourStr); minute = Integer.parseInt(minuteStr); second = Integer.parseInt(secondStr); } catch (Exception e) { return null; } return toDate(month, day, year, hour, minute, second); } /** Makes a Date from separate ints for month, day, year, hour, minute, and second. * @param month The month int * @param day The day int * @param year The year int * @param hour The hour int * @param minute The minute int * @param second The second int * @return A Date made from separate ints for month, day, year, hour, minute, and second. */ public static java.util.Date toDate(int month, int day, int year, int hour, int minute, int second) { Calendar calendar = Calendar.getInstance(); try { calendar.set(year, month - 1, day, hour, minute, second); } catch (Exception e) { return null; } return new java.util.Date(calendar.getTime().getTime()); } /** Makes a date String in the format MM/DD/YYYY from a Date * @param date The Date * @return A date String in the format MM/DD/YYYY */ public static String toDateString(java.util.Date date) { if (date == null) return ""; Calendar calendar = Calendar.getInstance(); calendar.setTime(date); int month = calendar.get(Calendar.MONTH) + 1; int day = calendar.get(Calendar.DAY_OF_MONTH); int year = calendar.get(Calendar.YEAR); String monthStr; String dayStr; String yearStr; if (month < 10) { monthStr = "0" + month; } else { monthStr = "" + month; } if (day < 10) { dayStr = "0" + day; } else { dayStr = "" + day; } yearStr = "" + year; //Modified by Vanish -- 2003.1.2 return yearStr + "-" + monthStr + "-" + dayStr ; // return monthStr + "/" + dayStr + "/" + yearStr; } /** Makes a time String in the format HH:MM:SS from a Date. If the seconds are 0, then the output is in HH:MM. * @param date The Date * @return A time String in the format HH:MM:SS or HH:MM */ public static String toTimeString(java.util.Date date) { if (date == null) return ""; Calendar calendar = Calendar.getInstance(); calendar.setTime(date); return (toTimeString(calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE), calendar.get(Calendar.SECOND))); } /** Makes a time String in the format HH:MM:SS from a separate ints for hour, minute, and second. If the seconds are 0, then the output is in HH:MM. * @param hour The hour int * @param minute The minute int * @param second The second int * @return A time String in the format HH:MM:SS or HH:MM */ public static String toTimeString(int hour, int minute, int second) { String hourStr; String minuteStr; String secondStr; if (hour < 10) { hourStr = "0" + hour; } else { hourStr = "" + hour; } if (minute < 10) { minuteStr = "0" + minute; } else { minuteStr = "" + minute; } if (second < 10) { secondStr = "0" + second; } else { secondStr = "" + second; } if (second == 0) return hourStr + ":" + minuteStr; else return hourStr + ":" + minuteStr + ":" + secondStr; } /** Makes a combined data and time string in the format "MM/DD/YYYY HH:MM:SS" from a Date. If the seconds are 0 they are left off. * @param date The Date * @return A combined data and time string in the format "MM/DD/YYYY HH:MM:SS" where the seconds are left off if they are 0. */ public static String toDateTimeString(java.util.Date date) { if (date == null) return ""; String dateString = toDateString(date); String timeString = toTimeString(date); if (dateString != null && timeString != null) return dateString + " " + timeString; else return ""; } /** Makes a Timestamp for the beginning of the month * @return A Timestamp of the beginning of the month */ public static java.sql.Timestamp monthBegin() { Calendar mth = Calendar.getInstance(); mth.set(Calendar.DAY_OF_MONTH, 1); mth.set(Calendar.HOUR_OF_DAY, 0); mth.set(Calendar.MINUTE, 0); mth.set(Calendar.SECOND, 0); mth.set(Calendar.AM_PM, Calendar.AM); return new java.sql.Timestamp(mth.getTime().getTime()); } public static java.sql.Timestamp getDayBegin(String date) throws ParseException{ SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date fieldDate = sdf.parse(date); return new java.sql.Timestamp(fieldDate.getTime()); } public static java.sql.Timestamp getDayEnd(String date) throws ParseException{ SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date fieldDate = sdf.parse(date); return getDayEnd(new java.sql.Timestamp(fieldDate.getTime())); } public static long compareTo(Date start,Date end){ //return -N , 0 , N for compart two Date return (start.getTime() - end.getTime() )/(1000*60*60*24); } public static String getDateBegin(String date){ return date+" 00:00:00"; } public static String getDateEnd(String date){ return date+" 23:59:59"; } public static Date getBeforeDay(Date date,int days){ Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.add(Calendar.DATE,days); Date alertTime = cal.getTime(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); java.util.Date fieldDate = null; try { fieldDate = sdf.parse(alertTime.toLocaleString()); } catch (ParseException e) { e.printStackTrace(); } return fieldDate; } public static int get(Date startDate,Date endDate){ return (int)((startDate.getTime()-endDate.getTime())/(60*1000)); } public static Date getStartDayOfWeek(Date datePatter) { Calendar _cal = Calendar.getInstance(); _cal.setTime(datePatter); if (_cal.get(_cal.DAY_OF_WEEK) == _cal.SUNDAY) { _cal.add(_cal.DAY_OF_YEAR, -6); return _cal.getTime(); } else if(_cal.get(_cal.DAY_OF_WEEK) == _cal.MONDAY) { return datePatter; }else { _cal.add(_cal.DAY_OF_YEAR, (_cal.MONDAY - _cal.get(_cal.DAY_OF_WEEK))); return _cal.getTime(); } } public static Date getEndDayOfWeek(Date datePatter) { Calendar _cal = Calendar.getInstance(); _cal.setTime(datePatter); if (_cal.get(_cal.DAY_OF_WEEK) == _cal.SUNDAY) { return datePatter; } else { _cal.add(_cal.DAY_OF_YEAR, (8 - _cal.get(_cal.DAY_OF_WEEK))); return _cal.getTime(); } } public static Date getMonthStart(Date datePatter) { Calendar _cal = Calendar.getInstance(); _cal.setTime(datePatter); _cal.set(_cal.DAY_OF_MONTH, 1); return _cal.getTime(); } public static Date getMonthEnd(Date datePatter) { Calendar _cal = Calendar.getInstance(); _cal.setTime(datePatter); _cal.set(_cal.DAY_OF_MONTH, _cal.getActualMaximum(_cal.DAY_OF_MONTH)); return _cal.getTime(); } }
发表评论
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complex sql search
2013-12-19 15:58 951Declare sqlStr_part1 varcha ... -
任意2个对象的比较 Object Compare
2011-05-13 17:30 1793直接上源码: 先来测试用的例子类: public class ... -
jxl 例子
2009-11-05 17:13 1150package chb.util; ... -
freeMark全解
2009-11-05 17:10 15670(1)模板 + 数据模型 = 输出 FreeMarker基 ... -
js 日期函数
2009-11-05 17:04 1006Date.prototype.isLeapYear 判断闰年 ... -
Valid util
2009-09-25 14:58 1414/* * $Id: UtilValidate.java,v ... -
jfree chart test
2009-09-25 14:55 1750/* * Created on 2009-9-7 * ... -
order set
2009-09-25 14:49 948/* * $Id: OrderedMap.java,v 1 ... -
order map
2009-09-25 14:48 1144/* * $Id: OrderedMap.java,v 1 ...
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在Java 8之后,推荐使用`java.time`包中的`LocalDate`、`LocalTime`、`LocalDateTime`等类。 - `Calendar`是抽象类,提供了更灵活的日期时间操作,如日历字段的增加和减少,但使用相对复杂。 7. **功能接口**: ...
8. TimeZone和Locale类:处理时区和地域设置,用于国际化和本地化。 9. EventObject和EventListener接口:与事件处理相关,是观察者模式的一部分,通常在图形用户界面编程中使用。 10. ResourceBundle类:用于加载...
Java的`java.util.Date`和`java.time`包提供了处理日期和时间的方法。`SimpleDateFormat`用于格式化和解析日期,而Java 8引入的`LocalDate`, `LocalTime`, `LocalDateTime`等类提供了更强大、更易用的时间日期API。...
- **Java 8后的新日期时间API**:`java.time`包下的`LocalDate`, `LocalTime`, `LocalDateTime`, `ZonedDateTime`等,提供了更强大、更易用的日期和时间处理功能。 4. **泛型**: - 自Java 5引入,提高了类型安全...
Java的java.util.Date类是Java初的时间类之一。该类的大部分方法已不推荐使用,取而代之的是java.util.Calendar类。不过你仍然可以使用java.util.Date类去表示某个时间。下面是一个如何实例化java.util.Date的例子:...
在Java中,处理时间的基本类是`java.util.Date`和`java.util.Calendar`,但这两个类自Java 8以后已被新的`java.time`包中的类所取代,如`LocalDate`, `LocalTime`, `LocalDateTime`, `Instant`等。这些新类提供了...
但在Java 8之后,已经被`java.time`包中的类所替代。 - `Calendar`类:抽象基类,提供了日期和时间字段的计算,如月份、日期、小时等。 - `SimpleDateFormat`:日期和时间格式化,允许自定义日期时间的字符串表示...
`Date`和`Calendar`是处理日期和时间的类,但在Java 8之后,`java.time`包的`LocalDate`、`LocalTime`、`LocalDateTime`等类更推荐使用,它们提供了更加直观和灵活的时间操作。 `Random`类用于生成随机数,可以生成...
Joda-Time考虑了闰秒的存在,这是`java.util.Date`和`Calendar`所忽视的。 6. **日期时间的查询** Joda-Time提供强大的日期时间查询功能,例如找出一年中的最后一天、获取当前季度的第一天等。 7. **兼容性与互...