java - How to use Calendar.getInstance with specified Locale -


i trying use calendar.getinstance(locale l) specified locale , not working. cannot figure out doing wrong.

the java doc. say:

getinstance public static calendar getinstance(locale alocale) gets calendar using default time zone , specified locale. the calendar returned based on current time in default time zone given locale. parameters: alocale - locale week data returns: calendar.

my code:

 public static void main (string[] args){       locale local = new locale("pt", "br");       calendar c = calendar.getinstance(local); // here using method      system.out.println(c.gettime()); // , here, cannot figure out why not working        dateformat dt = dateformat.getdateinstance(dateformat.long, local);      string s = dt.format(c.gettime());      system.out.println(s); // here example in portuguese brasil  }

output:

wed apr 29 10:18:16 brt 2015

29 de abril de 2015

should first print must in locale("pt", "br"), in portuguese?

the answer loc correct: call calendar::gettime produces java.util.date object. java.util.date class has no explicit time zone yet tostring method confusingly applies jvm’s current default time zone while generating string.

all confusing names , behavior - of many reasons avoid these poorly designed, confusing, , troublesome old legacy date-time classes. instead should using java.time classes officially supplant old classes.

java.time

get current moment in utc. instant class represents moment on timeline in utc resolution of nanoseconds (up 9 (9) digits of decimal fraction).

instant instant = instant.now();

you can create string represent value standard iso 8601 formatting calling tostring.

string output = instant.tostring();

2016-09-28t19:38:21z

the code in question ignores issue of time zone. when not specify time zone jvm’s current default time zone implicitly applied. better specify explicitly.

note locale , time zone 2 separate distinct issues.

  • locale determine (a) human language translation of name of day, name of month, , such, , (b) cultural norms deciding issues of abbreviation, capitalization, punctuation, , such.
  • time zone determines wall-clock time used present date-time value.

you can have combination of two. example, time zone of kolkata india french locale, or brazil portuguese locale auckland new zealand time zone. 

locale locale = new locale("pt", "br"); zoneid z = zoneid.of( "pacific/auckland" );

apply time zone zoneid produce zoneddatetime. conceptually, think of zoneddatetime = ( instant + zoneid ).

specify proper time zone name in format of continent/region. never use 3-4 letter abbreviation such est or ist not true time zones, not standardized, , not unique(!). 

zoneddatetime zdt = instant.atzone( z );

the locale not affect meaning, on presentation. can let locale object drive automatic localization of when producing string represent date-time value via datetimeformatter class. specify formatstyle determine how long or abbreviated should string be.

datetimeformatter f = datetimeformatter.oflocalizeddatetime( formatstyle.full )                                        .withlocale( locale ); string output = zdt.format( f );

dump console. instant , zdt objects seen here represent same moment, same point on timeline. difference view through lens of different region’s wall-clock time.

system.out.println ( "instant.tostring(): " + instant                       + " | zdt: " + zdt                       + " | output: " + output );

instant.tostring(): 2016-09-28t20:20:38.242z | zdt: 2016-09-29t09:20:38.242+13:00[pacific/auckland] | output: quinta-feira, 29 de setembro de 2016 09h20min38s nzdt

conversion

avoid old .date , .calendar classes. if must use them old code not yet updated java.time types, can convert. use new methods added old classes. here call java.util.gregoriancalendar.from( zoneddatetime ). 

java.util.calendar cal = java.util.gregoriancalendar.from( zdt ) ;

and, going other direction:

zoneddatetime zdt = mygregoriancalendar.tozoneddatetime() ;

about java.time

the java.time framework built java 8 , later. these classes supplant troublesome old date-time classes such java.util.date, .calendar, & java.text.simpledateformat.

the joda-time project, in maintenance mode, advises migration java.time.

to learn more, see oracle tutorial. , search stack overflow many examples , explanations.

much of java.time functionality back-ported java 6 & 7 in threeten-backport , further adapted android in threetenabp (see how use…).

the threeten-extra project extends java.time additional classes. project proving ground possible future additions java.time. may find useful classes here such interval, yearweek, yearquarter, , more.


Comments

Post a Comment

Popular posts from this blog

php - failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request -

this code i'm using find latitude , longitude of place: function coords($address){ echo $url="http://maps.googleapis.com/maps/api/geocode/json?address=".$address; $json = file_get_contents(urlencode($url)); $data = json_decode($json, true); print_r($data['results'][0]['geometry']['location']['lat']); print_r($data['results'][0]['geometry']['location']['lng']); } however returns warning: failed open stream: http request failed! http/1.0 400 bad request if use above code in simple procedure works fine not in function. note: have tried curl_init()... method produced same result? instead of encoding whole url encode address part. following code work fine $add='jamshoro phase 2'; $url="http://maps.googleapis.com/maps/api/geocode/json?address=".urlencode($add); $json = file_get_contents($url); $data = json_decode($json, true); print_r($data['r...
Read more

command line - Use qwinsta in PowerShell ISE -

i trying use qwinsta , rwinsta powershell code. when try run error "the term 'qwinsta' not recognized name of cmdlet, function, script file, or operable program." need able remotely on several machines without having add .dll's or modules other machines. tried terminal services powershell module, need able put on remote machines , not able that. within powershell ise how run qwinsta? not looking parse information gather it. following code have tried (which had found on site also): function get-tssessions { param( $computername = "localhost" ) qwinsta /server:$computername | #parse output foreach-object { $_.trim() -replace "\s+","," } | #convert objects convertfrom-csv } get-tssessions -computername "localhost" | ft -autosize best have running powershell ise (x86). when run command qwinsta there same error you. of course assuming have 64-bit os. th...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more