锘??xml version="1.0" encoding="utf-8" standalone="yes"?>
1銆傛墍鏈夋誕鐐硅繍綆楅兘鍦ㄦ暟鎹簱鍐呭仛濂斤紝涔熷氨鏄兘鐢╯ql瀹炵幇浜?BR>2銆傜敤BigDecimal瀹炵幇錛屾柟娉曞涓嬶紙浠呬粎鏄釜渚嬪瓙錛夛細
import java.math.BigDecimal;
public class tt {
/**
* @param args
*/
public static void main(String[] args) {
float a = 1.1f;
float b = 2.2f;
tt t = new tt();
System.out.println(t.add(a,b));
System.out.println(t.sub(a,b));
System.out.println(t.mul(a,b));
System.out.println(t.div(a,b));
System.out.println(t.round(a));
}
public float add(float v1,float v2){//鍔犳硶
BigDecimal b1 = new BigDecimal(Float.toString(v1));
BigDecimal b2 = new BigDecimal(Float.toString(v2));
return b1.add(b2).floatValue();
}
public float sub(float v1,float v2){//鍑忔硶
BigDecimal b1 = new BigDecimal(Float.toString(v1));
BigDecimal b2 = new BigDecimal(Float.toString(v2));
return b1.subtract(b2).floatValue();
}
public float mul(float v1,float v2){//涔樻硶
BigDecimal b1 = new BigDecimal(Float.toString(v1));
BigDecimal b2 = new BigDecimal(Float.toString(v2));
return b1.multiply(b2).floatValue();
}
public float div(float v1,float v2){//闄ゆ硶
BigDecimal b1 = new BigDecimal(Float.toString(v1));
BigDecimal b2 = new BigDecimal(Float.toString(v2));
return b1.divide(b2,3,BigDecimal.ROUND_HALF_UP).floatValue();
}
public float round(float v){//鎴彇3浣?BR> BigDecimal b = new BigDecimal(Float.toString(v));
BigDecimal one = new BigDecimal("1");
return b.divide(one,3,BigDecimal.ROUND_HALF_UP).floatValue();
}
}
Alt+Left:鍥為涓姝?/P>
Alt+Right:鍓嶈煩涓姝?/P>
Ctrl+Shift+T:鎵撳紑綾誨瀷
Ctrl+Shift+R:鎵撳紑璧勬簮
Ctrl+Q:鍥炲埌鏈鍚庝竴嬈$紪杈戠殑鍦版柟
Ctrl+Shift+G: 鍦╳orkspace涓悳绱㈠紩鐢?/P>
Ctrl+Alt+Down: 澶嶅埗楂樹寒鏄劇ず鐨勪竴琛屾垨澶氳
Alt+Up(Down):灝嗕竴琛屾垨鑰呭琛屽悜涓婃垨鑰呭悜涓嬬Щ鍔?BR>
Java 璇█鐨凜alendar(鏃ュ巻),Date(鏃ユ湡), 鍜孌ateFormat(鏃ユ湡鏍煎紡)緇勬垚浜咼ava鏍囧噯鐨勪竴涓熀鏈絾鏄潪甯擱噸瑕佺殑閮ㄥ垎. 鏃ユ湡鏄晢涓氶昏緫璁$畻涓涓叧閿殑閮ㄥ垎. 鎵鏈夌殑寮鍙戣呴兘搴旇鑳藉璁$畻鏈潵鐨勬棩鏈? 瀹氬埗鏃ユ湡鐨勬樉紺烘牸寮? 騫跺皢鏂囨湰鏁版嵁瑙f瀽鎴愭棩鏈熷璞? 鎴戜滑鍐欎簡涓ょ瘒鏂囩珷, 榪欐槸絎竴綃? 鎴戜滑灝嗗ぇ姒傜殑瀛︿範鏃ユ湡, 鏃ユ湡鏍煎紡, 鏃ユ湡鐨勮В鏋愬拰鏃ユ湡鐨勮綆?
鎴戜滑灝嗚璁轟笅闈㈢殑綾?
1銆佸叿浣撶被(鍜屾娊璞$被鐩稿)java.util.Date
2銆佹娊璞$被java.text.DateFormat 鍜屽畠鐨勪竴涓叿浣撳瓙綾?java.text.SimpleDateFormat
3銆佹娊璞$被java.util.Calendar 鍜屽畠鐨勪竴涓叿浣撳瓙綾?java.util.GregorianCalendar
鍏蜂綋綾誨彲浠ヨ瀹炰緥鍖? 浣嗘槸鎶借薄綾誨嵈涓嶈兘. 浣犻鍏堝繀欏誨疄鐜版娊璞$被鐨勪竴涓叿浣撳瓙綾?
Date 綾諱粠Java 寮鍙戝寘(JDK) 1.0 灝卞紑濮嬭繘鍖? 褰撴椂瀹冨彧鍖呭惈浜嗗嚑涓彇寰楁垨鑰呰緗竴涓棩鏈熸暟鎹殑鍚勪釜閮ㄥ垎鐨勬柟娉? 姣斿璇存湀, 鏃? 鍜屽勾. 榪欎簺鏂規硶鐜板湪閬埌浜嗘壒璇勫茍涓斿凡緇忚杞Щ鍒頒簡Calendar綾婚噷鍘諱簡, 鎴戜滑灝嗗湪鏈枃涓繘涓姝ヨ璁哄畠. 榪欑鏀硅繘鏃ㄥ湪鏇村ソ鐨勫鐞嗘棩鏈熸暟鎹殑鍥介檯鍖栨牸寮? 灝辮薄鍦↗DK 1.1涓竴鏍? Date 綾誨疄闄呬笂鍙槸涓涓寘瑁圭被, 瀹冨寘鍚殑鏄竴涓暱鏁村瀷鏁版嵁, 琛ㄧず鐨勬槸浠嶨MT(鏍兼灄灝兼不鏍囧噯鏃墮棿)1970騫? 1 鏈?1鏃?0:00:00榪欎竴鍒諱箣鍓嶆垨鑰呮槸涔嬪悗緇忓巻鐨勬縐掓暟.
涓銆佸垱寤轟竴涓棩鏈熷璞?
璁╂垜浠湅涓涓嬌鐢ㄧ郴緇熺殑褰撳墠鏃ユ湡鍜屾椂闂村垱寤轟竴涓棩鏈熷璞″茍榪斿洖涓涓暱鏁存暟鐨勭畝鍗曚緥瀛? 榪欎釜鏃墮棿閫氬父琚О涓篔ava 铏氭嫙鏈?JVM)涓繪満鐜鐨勭郴緇熸椂闂?
import java.util.Date;
public class DateExample1 {
public static void main(String[] args) {
// Get the system date/time
Date date = new Date();
System.out.println(date.getTime());
}
}
鍦ㄦ槦鏈熷叚, 2001騫?鏈?9鏃? 涓嬪崍澶х害鏄?:50鐨勬牱瀛? 涓婇潰鐨勪緥瀛愬湪緋葷粺杈撳嚭璁懼涓婃樉紺虹殑緇撴灉鏄?1001803809710. 鍦ㄨ繖涓緥瀛愪腑,鍊煎緱娉ㄦ剰鐨勬槸鎴戜滑浣跨敤浜咲ate 鏋勯犲嚱鏁板垱寤轟竴涓棩鏈熷璞? 榪欎釜鏋勯犲嚱鏁版病鏈夋帴鍙椾換浣曞弬鏁? 鑰岃繖涓瀯閫犲嚱鏁板湪鍐呴儴浣跨敤浜?System.currentTimeMillis() 鏂規硶鏉ヤ粠緋葷粺鑾峰彇鏃ユ湡.
閭d箞, 鐜板湪鎴戜滑宸茬粡鐭ラ亾浜嗗浣曡幏鍙栦粠1970騫?鏈?鏃ュ紑濮嬬粡鍘嗙殑姣鏁頒簡. 鎴戜滑濡備綍鎵嶈兘浠ヤ竴縐嶇敤鎴鋒槑鐧界殑鏍煎紡鏉ユ樉紺鴻繖涓棩鏈熷憿? 鍦ㄨ繖閲岀被 java.text.SimpleDateFormat 鍜屽畠鐨勬娊璞″熀綾?java.text.DateFormat 灝辨淳寰椾笂鐢ㄥ満浜?
浜屻佹棩鏈熸暟鎹殑瀹氬埗鏍煎紡
鍋囧鎴戜滑甯屾湜瀹氬埗鏃ユ湡鏁版嵁鐨勬牸寮? 姣旀柟鏄熸湡鍏?9鏈?29鏃?2001騫? 涓嬮潰鐨勪緥瀛愬睍紺轟簡濡備綍瀹屾垚榪欎釜宸ヤ綔:
import java.text.SimpleDateFormat;
import java.util.Date;
public class DateExample2 {
public static void main(String[] args) {
SimpleDateFormat bartDateFormat =
new SimpleDateFormat("EEEE-MMMM-dd-yyyy");
Date date = new Date();
System.out.println(bartDateFormat.format(date));
}
}
鍙閫氳繃鍚慡impleDateFormat 鐨勬瀯閫犲嚱鏁頒紶閫掓牸寮忓瓧絎︿覆"EEE-MMMM-dd-yyyy", 鎴戜滑灝辮兘澶熸寚鏄庤嚜宸辨兂瑕佺殑鏍煎紡. 浣犲簲璇ュ彲浠ョ湅瑙? 鏍煎紡瀛楃涓蹭腑鐨凙SCII 瀛楃鍛婅瘔鏍煎紡鍖栧嚱鏁頒笅闈㈡樉紺烘棩鏈熸暟鎹殑鍝竴涓儴鍒? EEEE鏄槦鏈? MMMM鏄湀, dd鏄棩, yyyy鏄勾. 瀛楃鐨勪釜鏁板喅瀹氫簡鏃ユ湡鏄浣曟牸寮忓寲鐨?浼犻?EE-MM-dd-yy"浼氭樉紺?Sat-09-29-01. 璇峰療鐪婼un 鍏徃鐨?Web 绔欑偣鑾峰彇鏃ユ湡鏍煎紡鍖栭夐」鐨勫畬鏁寸殑鎸囩ず.
涓夈佸皢鏂囨湰鏁版嵁瑙f瀽鎴愭棩鏈熷璞?
鍋囪鎴戜滑鏈変竴涓枃鏈瓧絎︿覆鍖呭惈浜嗕竴涓牸寮忓寲浜嗙殑鏃ユ湡瀵硅薄, 鑰屾垜浠笇鏈涜В鏋愯繖涓瓧絎︿覆騫朵粠鏂囨湰鏃ユ湡鏁版嵁鍒涘緩涓涓棩鏈熷璞? 鎴戜滑灝嗗啀嬈′互鏍煎紡鍖栧瓧絎︿覆"MM-dd-yyyy" 璋冪敤SimpleDateFormat綾? 浣嗘槸榪欎竴嬈? 鎴戜滑浣跨敤鏍煎紡鍖栬В鏋愯屼笉鏄敓鎴愪竴涓枃鏈棩鏈熸暟鎹? 鎴戜滑鐨勪緥瀛? 鏄劇ず鍦ㄤ笅闈? 灝嗚В鏋愭枃鏈瓧絎︿覆"9-29-2001"騫跺垱寤轟竴涓間負001736000000 鐨勬棩鏈熷璞?
渚嬪瓙紼嬪簭:
import java.text.SimpleDateFormat;
import java.util.Date;
public class DateExample3 {
public static void main(String[] args) {
// Create a date formatter that can parse dates of
// the form MM-dd-yyyy.
SimpleDateFormat bartDateFormat =
new SimpleDateFormat("MM-dd-yyyy");
// Create a string containing a text date to be parsed.
String dateStringToParse = "9-29-2001";
try {
// Parse the text version of the date.
// We have to perform the parse method in a
// try-catch construct in case dateStringToParse
// does not contain a date in the format we are expecting.
Date date = bartDateFormat.parse(dateStringToParse);
// Now send the parsed date as a long value
// to the system output.
System.out.println(date.getTime());
}catch (Exception ex) {
System.out.println(ex.getMessage());
}
}
}
浜斻佷嬌鐢ㄦ爣鍑嗙殑鏃ユ湡鏍煎紡鍖栬繃紼?
鏃㈢劧鎴戜滑宸茬粡鍙互鐢熸垚鍜岃В鏋愬畾鍒剁殑鏃ユ湡鏍煎紡浜? 璁╂垜浠潵鐪嬩竴鐪嬪浣曚嬌鐢ㄥ唴寤虹殑鏍煎紡鍖栬繃紼? 鏂規硶 DateFormat.getDateTimeInstance() 璁╂垜浠緱浠ョ敤鍑犵涓嶅悓鐨勬柟娉曡幏寰楁爣鍑嗙殑鏃ユ湡鏍煎紡鍖栬繃紼? 鍦ㄤ笅闈㈢殑渚嬪瓙涓? 鎴戜滑鑾峰彇浜嗗洓涓唴寤虹殑鏃ユ湡鏍煎紡鍖栬繃紼? 瀹冧滑鍖呮嫭涓涓煭鐨? 涓瓑鐨? 闀跨殑, 鍜屽畬鏁寸殑鏃ユ湡鏍煎紡.
import java.text.DateFormat;
import java.util.Date;
public class DateExample4 {
public static void main(String[] args) {
Date date = new Date();
DateFormat shortDateFormat =
DateFormat.getDateTimeInstance(
DateFormat.SHORT,
DateFormat.SHORT);
DateFormat mediumDateFormat =
DateFormat.getDateTimeInstance(
DateFormat.MEDIUM,
DateFormat.MEDIUM);
DateFormat longDateFormat =
DateFormat.getDateTimeInstance(
DateFormat.LONG,
DateFormat.LONG);
DateFormat fullDateFormat =
DateFormat.getDateTimeInstance(
DateFormat.FULL,
DateFormat.FULL);
System.out.println(shortDateFormat.format(date));
System.out.println(mediumDateFormat.format(date));
System.out.println(longDateFormat.format(date));
System.out.println(fullDateFormat.format(date));
}
}
娉ㄦ剰鎴戜滑鍦ㄥ getDateTimeInstance鐨勬瘡嬈¤皟鐢ㄤ腑閮戒紶閫掍簡涓や釜鍊? 絎竴涓弬鏁版槸鏃ユ湡椋庢牸, 鑰岀浜屼釜鍙傛暟鏄椂闂撮鏍? 瀹冧滑閮芥槸鍩烘湰鏁版嵁綾誨瀷int(鏁村瀷). 鑰冭檻鍒板彲璇繪? 鎴戜滑浣跨敤浜咲ateFormat 綾繪彁渚涚殑甯擱噺: SHORT, MEDIUM, LONG, 鍜?FULL. 瑕佺煡閬撹幏鍙栨椂闂村拰鏃ユ湡鏍煎紡鍖栬繃紼嬬殑鏇村鐨勬柟娉曞拰閫夐」, 璇風湅Sun 鍏徃Web 绔欑偣涓婄殑瑙i噴.
榪愯鎴戜滑鐨勪緥瀛愮▼搴忕殑鏃跺? 瀹冨皢鍚戞爣鍑嗚緭鍑鴻澶囪緭鍑轟笅闈㈢殑鍐呭:
9/29/01 8:44 PM
Sep 29, 2001 8:44:45 PM
September 29, 2001 8:44:45 PM EDT
Saturday, September 29, 2001 8:44:45 PM EDT
鍏丆alendar 綾?
鎴戜滑鐜板湪宸茬粡鑳藉鏍煎紡鍖栧茍鍒涘緩涓涓棩鏈熷璞′簡, 浣嗘槸鎴戜滑濡備綍鎵嶈兘璁劇疆鍜岃幏鍙栨棩鏈熸暟鎹殑鐗瑰畾閮ㄥ垎鍛? 姣斿璇村皬鏃? 鏃? 鎴栬呭垎閽? 鎴戜滑鍙堝浣曞湪鏃ユ湡鐨勮繖浜涢儴鍒嗗姞涓婃垨鑰呭噺鍘誨煎憿? 絳旀鏄嬌鐢–alendar 綾? 灝卞鎴戜滑鍓嶉潰鎻愬埌鐨勯偅鏍? Calendar 綾諱腑鐨勬柟娉曟浛浠d簡Date 綾諱腑琚漢鍞鵑獋鐨勬柟娉?
鍋囪浣犳兂瑕佽緗? 鑾峰彇, 鍜屾搷綰典竴涓棩鏈熷璞$殑鍚勪釜閮ㄥ垎, 姣旀柟涓涓湀鐨勪竴澶╂垨鑰呮槸涓涓槦鏈熺殑涓澶? 涓轟簡婕旂ず榪欎釜榪囩▼, 鎴戜滑灝嗕嬌鐢ㄥ叿浣撶殑瀛愮被 java.util.GregorianCalendar. 鑰冭檻涓嬮潰鐨勪緥瀛? 瀹冭綆楀緱鍒頒笅闈㈢殑絎崄涓槦鏈熶簲鏄?3鍙?
import java.util.GregorianCalendar;
import java.util.Date;
import java.text.DateFormat;
public class DateExample5 {
public static void main(String[] args) {
DateFormat dateFormat =
DateFormat.getDateInstance(DateFormat.FULL);
// Create our Gregorian Calendar.
GregorianCalendar cal = new GregorianCalendar();
// Set the date and time of our calendar
// to the system&s date and time
cal.setTime(new Date());
System.out.println("System Date: " +
dateFormat.format(cal.getTime()));
// Set the day of week to FRIDAY
cal.set(GregorianCalendar.DAY_OF_WEEK,
GregorianCalendar.FRIDAY);
System.out.println("After Setting Day of Week to Friday: " +
dateFormat.format(cal.getTime()));
int friday13Counter = 0;
while (friday13Counter <= 10) {
// Go to the next Friday by adding 7 days.
cal.add(GregorianCalendar.DAY_OF_MONTH, 7);
// If the day of month is 13 we have
// another Friday the 13th.
if (cal.get(GregorianCalendar.DAY_OF_MONTH) == 13) {
friday13Counter++;
System.out.println(dateFormat.format(cal.getTime()));
}
}
}
}
鍦ㄨ繖涓緥瀛愪腑鎴戜滑浣滀簡鏈夎叮鐨勫嚱鏁拌皟鐢?
cal.set(GregorianCalendar.DAY_OF_WEEK, GregorianCalendar.FRIDAY);
鍜?
cal.add(GregorianCalendar.DAY_OF_MONTH, 7);
set 鏂規硶鑳藉璁╂垜浠氳繃綆鍗曠殑璁劇疆鏄熸湡涓殑鍝竴澶╄繖涓煙鏉ュ皢鎴戜滑鐨勬椂闂磋皟鏁翠負鏄熸湡浜? 娉ㄦ剰鍒拌繖閲屾垜浠嬌鐢ㄤ簡甯擱噺 DAY_OF_WEEK 鍜?FRIDAY鏉ュ寮轟唬鐮佺殑鍙鎬? add 鏂規硶璁╂垜浠兘澶熷湪鏃ユ湡涓婂姞涓婃暟鍊? 娑﹀勾鐨勬墍鏈夊鏉傜殑璁$畻閮界敱榪欎釜鏂規硶鑷姩澶勭悊.
鎴戜滑榪欎釜渚嬪瓙鐨勮緭鍑虹粨鏋滄槸:
System Date: Saturday, September 29, 2001
褰撴垜浠皢瀹冭緗垚鏄熸湡浜斾互鍚庡氨鎴愪簡: Friday, September 28, 2001
Friday, September 13, 2002
Friday, December 13, 2002
Friday, June 13, 2003
Friday, February 13, 2004
Friday, August 13, 2004
Friday, May 13, 2005
Friday, January 13, 2006
Friday, October 13, 2006
Friday, April 13, 2007
Friday, July 13, 2007
Friday, June 13, 2008
涓冦佹椂闂存帉鎻″湪浣犵殑鎵嬮噷
鏈変簡榪欎簺Date 鍜孋alendar 綾葷殑渚嬪瓙, 浣犲簲璇ヨ兘澶熶嬌鐢?java.util.Date, java.text.SimpleDateFormat, 鍜?java.util.GregorianCalendar 鍒涘緩璁稿鏂規硶浜?
鍦ㄤ笅闈㈢殑鏂囩珷涓? 鎴戜滑灝嗚璁烘洿楂樼駭鐨凞ate 鍜?Calendar 綾葷殑浣跨敤鎶宸? 鍖呮嫭鏃跺尯鍜屽浗闄呭寲鐨勬牸寮? 鎴戜滑榪樹細鑰冨療涓や釜鏃ユ湡綾?java.sql.Date 鍜?java.util.Date 涔嬮棿鐨勫尯鍒?
鍐欐枃浠?BR>BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("outfilename")));
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