Java has a standard library that makes use of a constrained parametric polymorphism in the form of "generics."
You can see tons of examples, List<T>, Set<T>, etc... This is pretty basic Java stuff, if you can write in C++, learning and using Java should be easy. Kris On Thu, Jun 16, 2011 at 3:51 PM, [email protected] < [email protected]> wrote: > kris, what is the java equivalent to stl (c++) ? > i agree, if easy, i would prefere to port it :-( ...and to avooid > JNI... > > On Jun 16, 2:28 pm, Kristopher Micinski <[email protected]> > wrote: > > Unfortunately if you're doing heavy computing, it might *not* make sense. > > This is typically the quickest way to kill the battery, and your > > application probably is not structured to fit the android specifics. > (For > > example, what happens if your app is killed after running for a while? > This > > doesn't happen in linux, but certainly happens on Android.) > > > > You'll have to use the NDK-JNI if you want to keep any of your c++ code. > > How much do you have? Rough estimate? > > > > You don't have access to the "old world" unix IPC, mostly because of > > restrictions imposed for security reasons. > > > > Difficulty of porting c++/stl to Java should be minimal. It will take > time, > > but the languages are fairly similar. The thing that will really take > time > > is restructuring your application to work within the Android process > model, > > which might require a methodology change depending on your apps > structure. > > I'm trusting that if your code is complex enough you won't give away > what > > it does, then you shouldn't have any trouble learning to port it :o)... > > > > Kris > > > > On Thu, Jun 16, 2011 at 3:17 PM, [email protected] < > > > > [email protected]> wrote: > > > hello Kris, thanks for answering. > > > Well ... in my case it makes sense :-( but i don want to go into > > > functionality details. Fact is that i have a c/c++(STL) application > > > which makes some computations :-( and i need it to communicate in any > > > way with a java-androide aplication which will be the UI: one option > > > is NDK-JNI but if possible, i would like to avoid JNI. I wonder, may i > > > run my c++(STL) appl concurrently with the java UI and communicate > > > both of them in order to change some basic information? .. sockets ... > > > pipes ... other .. without JNI ? > > > > > any way, a NDK-JNI-c++-STL example will be very welcome, if any one of > > > you guys may share it .. > > > > > and, by the way, how can i port (easy) C++/STL to java ??? > > > > > On Jun 16, 1:51 pm, Kristopher Micinski <[email protected]> > > > wrote: > > > > What application are you trying to migrate? > > > > > > Android is different enough, that you will probably be better off > > > rewriting > > > > the application in the SDK framework. > > > > > > The NDK wasn't designed to write whole applications, depending on how > > > large > > > > your app is it might be better to rewrite the whole thing. But > perhaps > > > > another solution is to keep what you can, and change what you need. > > > > > > In any case, most of the time, dropping a few thousand lines of c++ > into > > > a > > > > mobile environment just doesn't make sense (i.e., the environment is > > > > different enough that structuring your app different might really be > > > needed, > > > > and if it's a batch processing app it might not make sense to perform > > > some > > > > of the operations in a mobile environment...) > > > > > > Kris > > > > > > On Thu, Jun 16, 2011 at 11:55 AM, [email protected] < > > > > > > [email protected]> wrote: > > > > > hi guys, > > > > > I would like to migrate a c/c++ (linux fedora 14) application to > > > > > android 2.2. > > > > > Because this will be my first migration, i have some questions > about > > > > > the procedure: > > > > > > > 1. considering it has some STL stuff, i wonder if it will work. I > > > > > specially use vector, set, map and algoritms (set_union, > > > > > set_intersection, set_difference). > > > > > > > 2. as i understand i have to write -first- a Java-JNI application > > > > > which declares and interface my c functions and c++ methods. Those > > > > > methods willl be included into one (or many) shared libraries ... > is > > > > > it ok ? ... may somebody advise me a good JNI tutorial ? ... i don > > > > > like the ones i've found :-( > > > > > > > 3- once ready, i must use the NDK toolset in order to generate the > > > > > android application ... hopefully i will works.. > > > > > > > I am worried because the NDK info says to have a "A Minimal set of > > > > > headers for C++ support" ... and i wonder if STL works or not ... > > > > > but, NDK r5 - android - suposse to also hav support for STLport ... > > > > > does any body has the hello-jni file modifyied for STL suppport ? > > > > > > > NDK Doc also says that "Applications that use native activities > must > > > > > be run on Android 2.3 (API Level 9) or later", but as i understand, > i > > > > > will also needs JNI .. may somebody make some comments about it ? > > > > > > > finally, may somebody share me a JNI example in order to pass some > STL > > > > > functions between java and c++ ? > > > > > > > comments are wellcome. > > > > > > > regards, thanks in advance > > > > > > > hector > > > > > > > -- > > > > > You received this message because you are subscribed to the Google > > > > > Groups "Android Developers" group. > > > > > To post to this group, send email to > > > [email protected] > > > > > To unsubscribe from this group, send email to > > > > > [email protected] > > > > > For more options, visit this group at > > > > >http://groups.google.com/group/android-developers?hl=en > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "Android Developers" group. > > > To post to this group, send email to > [email protected] > > > To unsubscribe from this group, send email to > > > [email protected] > > > For more options, visit this group at > > >http://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. 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