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Is Java good-to-learn-next language for an embedded software engineer who mainly develops firmwares and drivers? If not so useful, why?

Which language is more for that purpose, C++ or Java? I read on a lot of websites, that Java is the most payed programming language nowadays, but also that C++ mixed with C is very used in embedded software development.

I want to hear from some embedded software engineers on what programming language (C++ or Java) to pay attention for purpose I wrote above?

I think that just C is not enough and want to go in right direction, and not to learn something I will not use in embedded systems.

Thanks.

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closed as primarily opinion-based by helloworld922, Ignacio Vazquez-Abrams, Martin, PeterJ, Leon Heller Aug 19 '15 at 9:14

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ If your programming a micro controller that is not using an operating system we use C (or assembler if it has no stack to speak of. for example the small PIC chips) Often at this size you need the bit level and timing control as well as minuscule RAM constraints. However if it's an Internet of Things device it will have enough RAM for the network stack. \$\endgroup\$ – Spoon Aug 19 '15 at 8:08
  • \$\begingroup\$ C or Ada would both be better for embedded programming. \$\endgroup\$ – Brian Drummond Aug 19 '15 at 8:53
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I always use C programming language to program many embedded modules and microcontrollers. I have wroked on Atmel's PIC's STM controllers and programming them using C works fine always. Apart from this if you are planning to make UI interface for your embedded design and you are in windows, you can do it with C++/C# in visual studio or if you are in linux you can do it using gtk/glade which can be done in C. So if you want to design firmware or want to write drivers, you can use C. No need of java. I have never heard someone using java to make driver or firmware

So I think C is enough to start with any embedded design.

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I guess it depends on the size of the embedded system which language will actually be usable and useful.

For small devices I just can't see Java running at all on them. Oracle says that with 11MB you can run Java SE embedded on the device (1). There is the smaller Java ME embedded, which is quoted to need 1MB of ROM and 128kB of RAM (2). So Java is (for me) not a very scalable language in the downward direction. I can't tell how pleasurable it is to program Java on embedded devices as all of my projects were smaller than the minimum for Java ME.

On the other hand, C++ offers a lot of features you might want to use. It isn't that much of a difference performance and code size wise. If you don't use RTTI and exceptions, the code will grow by a few kilobytes without gaining much at first sight. The C++ runtime environment will be a bit bigger, there are some embedded C++ variants which bring these overheads down to barely visible numbers but prevent even more C++ constructs like templates.

But C++ offers you the ability to implement classes and inheritance, all the good OOP stuff basically. You can write hardware drivers completely in C++, so there is no need to go back to C at any point in your system, even the startup code can be written in C++.

I'd say in embedded systems you won't be able to play all the strong cards from C++ as some features aren't usable or allowed to be used. As example: dynamic instantiation is forbidden for safety critical applications (at least in my environment). Templates are also a debatable topic for safety critical applications as test are a bit of a hassle as they get dynamically created for each data type and you have to prove that your tests cover every data type used.

From a source code perspective, I find C++ creates a clearer concept of who does what and a clearer structure and is preferable over C.

Though if you are running on the really really small devices, you probably end up switching back to C or assembler alltogether.

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  • \$\begingroup\$ I often develop software for ARM processors, so they have enough resources to run Java. I'm just interested in question, what is language of future used in Embedded Systems, Java or C++? \$\endgroup\$ – Junior Aug 19 '15 at 8:09
  • \$\begingroup\$ @Junior As I pointed out, the answer depends on the target platform. If you are aiming for large embedded systems, Java might be the language to go for, or with recent developments C# might. I can only speak for smaller embedded systems and there I can't really see something other than C++. (and just saying ARM processors have enough resources is plain wrong, my ARM Cortex M0 doesn't have them) \$\endgroup\$ – Arsenal Aug 19 '15 at 8:19
  • \$\begingroup\$ @Junior language of future in Embedded System is C/C++ \$\endgroup\$ – Aircraft Aug 19 '15 at 8:38

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