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Java Forum / General / March 2007Java version & Applet
Hi I got some questions dealing with java-version in junction with Applets. When i compile an Applet with my jdk1.6 it can only be used when the client machine also has at least version 1.6, is that correct? Using the -target and -source-Switches I can force the compiler to create a classfile matching a lower version, vor example [1] says - source 1.2 -target 1.1 is the recommended setting for applets. This disables features like generics, what would be okay, but how is it about using packages like javax.swing.* od javax.xml.bind.*, which are not part of i.e. jre1.1. It seems that an Applet (or an Application either) would run without having these classfiles present. So i have to pack the needes classfiles out of the jars of my jre into my own jar-file. So, if i want to write an Applet, which target version is really recommended today (1.1 seems some kind of.. too old?) and how can I find out which packages i have to pack into the jar. Peter On Mar 17, 7:16 am, pkoer...@online.de wrote: .. > So, if i want to write an Applet, which target version is really > recommended today .. If anything is 'really recommended', it would be that you avoid applets. Launch an application using web start, then, even if the client has not got the minimum Java to needed to run the application, JWS will prompt them to upgrade. Andrew T. > .. To 'R. Vince' - the email has been deleted unread. Note the quote.. <http://groups.google.com/groups/profile? enc_user=7mTjyhYAAADCSWBnolz9mAH1YeBMyEJTo4cocwWvDVg2RHsu8f1bCg> Got something to say? Put it on the thread that it relates to. ( Note - I am not sure if the email relates to this thread, but the highlit line mentioned something about applets.. ) Andrew T. Andrew, Didn;t realize it hadn;t come through to the group. Regardless of your disdain for applets, I'm a big fan of Java Version Applet. Have you got any snippet of code to insert into the source of it to discern version 1.6 ? Thanks Andrew. .. > Didn;t realize it hadn;t come through to the group. Cool. Sorted now. >..Regardless of your > disdain for applets, I'm a big fan of Java Version Applet. Have you got any > snippet of code to insert into the source of it to > discern version 1.6 ? OK - so long as you are aware that I consider it a 'last ditch effort' at doing something when the user has no suitable Java, I suppose I could see my way clear to hunting through the JavaDocs for ... ..add this one .. java.sql.SQLClientInfoException ..it seems to have been introduced in 1.6. (You already have the code, right?) HTH Andrew T. Hi there > If anything is 'really recommended', it would > be that you avoid applets. Okay, thats something i have to think about. In this case the applet is yust a way of using an application without the need to download it, so Webstart seems just to do that. Thank you for that hint. Peter On Mar 17, 10:37 pm, pkoer...@online.de wrote: > Hi there > [quoted text clipped - 4 lines] > is yust a way of using an application without the need to download it, > so Webstart seems just to do that. Actually, it is more complicated, subtle, and useful than perhaps I described it. In seems to the end user, that no 'installation' happened, where in effect, it does. The classes and resources are cached locally. When the user launches the application (or applet) again, web start checks the net to see if there are any updates, but if it cannot, or there aren't any, it will launch the app. from the cache. Further, resources can be specified as either 'eager' or 'lazy'. Lazy means that the resource is not download until, or unless, the user needs that funtionality (think of an entire API that provides printing support to an app. - if the user never wants to print, why download it?) Andrew T. I found this one [http://www.physci.org/jws/#fs] as an example what can be done with JWS and it is very cool to see that JWS only asks for file-save-permissions, when really a file should be saved. I think that's what i want to have my own application acting like, so i will change the applet-functionality into an webstart-service. Thank you for your hints, Peter On Mar 19, 4:27 am, pkoer...@online.de wrote: > I found this one [http://www.physci.org/jws/#fs] as an example what > can be done with JWS and it is very cool to see that JWS only asks for > file-save-permissions, when really a file should be saved. Yes, I like that aspect of it, as well. >..I think > that's what i want to have my own application acting like, so i will > change the applet-functionality into an webstart-service. > Thank you for your hints, You're welcome. Andrew T. 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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