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Java Forum / General / July 2007Changing Locale setting at runtime
Hi, I'm developing an RCP application based on Eclipse 3.3. I wrote it down in my language and then I translated it using Externalize mechanism in Eclipse. When the application starts, a little login form appears. On that form there's a combobox with a list of languages. When I select a language I need to have the form (and the application) translated on-the-fly, without restart or something else. In the selection event of the combobox I wrote down: Locale.setDefault(localeSelectedFromCombo); but I want the application to be translated at runtime. How can I do that? Hi Marco Nobody knows? Hi Marco > Nobody knows? I can't find your original post. Anyway, assuming you want to set the default locale in a running Java program: If you do not have a security manager, you can use Locale.setDefault. Obviously you wouldn't want, say, an applet to change the locale setting for the whole JVM. It also wont update any cases where the default locale has already been read. A better way to do it is to read the default locale only once. As you construct locale-sensitive objects, pass them an object that wraps locale and allows callbacks (listeners) to be registered for changes. Tom Hawtin > I can't find your original post. That's the original post. I'm developing an RCP application based on Eclipse 3.3. I wrote it down in my language and then I translated it using Externalize mechanism in Eclipse. When the application starts, a little login form appears. On that form there's a combobox with a list of languages. When I select a language I need to have the form (and the application) translated on-the-fly, without restart or something else. In the selection event of the combobox I wrote down: Locale.setDefault(localeSelectedFromCombo); but I want the application to be translated at runtime. Hi Marco > Locale.setDefault(localeSelectedFromCombo); >but I want the application to be translated at runtime. You can set the system property that controls the locale on the command line. See http://mindprod.com/jgloss/properties.html for details I have never tried it, but you could try setting the system properties. In a pinch you would programmatically exec another JVM with the modified locale. see http://mindprod.com/jgloss/exec.html  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > You can set the system property that controls the locale on the > command line. See http://mindprod.com/jgloss/properties.html for > details Mine is not a problem of configuration, I know how to change the locale. The problem is about changing at runtime. I made an example... I have the login form on screen, and it's in english. From the language combo box I choose Italian (or French, German, ...) and I want the form to translate immediately. I have already all the properties files with translations. Hi Marco >Mine is not a problem of configuration, I know how to change the locale. >The problem is about changing at runtime. [quoted text clipped - 3 lines] >want the form to translate immediately. >I have already all the properties files with translations. see http://mindprod.com/jgloss/locale.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > I have the login form on screen, and it's in english. > From the language combo box I choose Italian (or French, German, ...) > and I want the form to translate immediately. > I have already all the properties files with translations. See the example at http://www.rgagnon.com/javadetails/java-0135.html Bye. SignatureReal Gagnon from Quebec, Canada * Java, Javascript, VBScript and PowerBuilder code snippets * http://www.rgagnon.com/howto.html * http://www.rgagnon.com/bigindex.html On Jul 15, 5:49 pm, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > In a pinch you would programmatically exec another JVM with the > modified locale. Are you mad?! One 260MB javaw.exe process is memory hog enough. Two at the same time is going to be problematical on 1GB machines and downright catastrophic on 512MB ones, where there'll be hours of thrashing while the first one bootstraps the second one and both are trying to be active simultaneously. Once the bootstrapper exits sanity returns, but ... nobody likes an application that takes 72 seconds of heavy disk activity to look like it's sorta beginning to maybe load, and another 300 or so to actually load. :P If you must programmatically exec the JVM with your main application with a UI-determined locale from a bootstrapper, for Christ's sake code the bootstrapper in C! It'll be all of 30KB that way, or around 1/1000 the size. Java simply doesn't scale well to program sizes smaller than major applications, when a normal (rather than micro edition) JRE is used. >Are you mad?! One 260MB javaw.exe process is memory hog enough I was presuming the spawner would exit, like a salmon dying after laying eggs. Even if that is not possible without killing the child, the spawner would page out of ram fairly quickly. Further much of javaw is now a shared DLL. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com On Jul 16, 4:04 pm, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > >Are you mad?! One 260MB javaw.exe process is memory hog enough > > I was presuming the spawner would exit, like a salmon dying after > laying eggs. They still run simultaneously for a while, with neither of them idle during part of that time. > Even if that is not possible without killing the child, the spawner would page out of ram fairly quickly. Once it goes idle. > Further much of javaw is now a shared DLL. Yep - all 132KB or so of it. The 259.8 or so remaining MB of process size being the big Java heap a separate one of which is created for each separate running virtual machine, as near as I can figure. >If you must programmatically exec the JVM with your main application >with a UI-determined locale from a bootstrapper, for Christ's sake >code the bootstrapper in C! It'll be all of 30KB that way, or around >1/1000 the size. see http://mindprod.com/project/kicker.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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