Which topics of Java SE are prerequisites for Java ME? [closed]

StackOverflow https://stackoverflow.com/questions/23654788

  •  22-07-2023
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题

I'm really new to Java and I'd like to ask you ,which aspects of Java SE are considered to be necessary for someone wanting to learn Java ME? Something like prerequisites.

To start with Java SE, I chose this book, but since I don't have much time, it would be great to hear from experienced developers which parts I should definitely focus on and which parts I could skip to save time.

If is there any topic from Java SE that could also be considered a prerequisite for Java ME, feel free to mention it.

有帮助吗？

解决方案

According to content in the book that you mentioned in the questions

  • Section 1 is must, would teach you basics about java.
  • Section 2: If you have already worked in any oo language then you can skip this section and come back to it later stage.
  • Section 3 and Section 6 will be good for you as the code you need to write , need to be memory efficient and multi-threaded.

其他提示

If you really need to learn JavaME from Java SE, then you should read an old Java SE 1.4 book, and just stick to the basics of the language.

Why? Well Java ME is based on JRE 1.3, so there are no generics, no collections (added in Java 6) and let alone Java 8's new stuff. If you buy a recent Java SE book, you might get confused because you won't be able to use these new features.

Second thing that differs, it is not an homogeneous platform. It is divided in two parts (CLDC/CDC for the core classes, and MIDP for the GUI classes). And there are optional profiles (JSRs) that migh or might not be supported in a certain device.

Other than this, you should always keep an eye on memory efficiency. Old devices do not have much RAM, so you should never try to load large images or data in memory, and always free resources when not used.

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