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new to J2ME, how fast can one learn it  RSS feed

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I would like to learn to develop in J2ME, for the time being just to enhance my skills. I'm already a J2EE developer. How fast can one learn this? I know not everybody is the same, but is it a matter of days, weeks (fulltime), just one book? Like probably all of you I'm a very busy person, and have to shuffle around with my time.
thank you for any reactions,
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If you already know Java you should pick it up very quickly. The major difference is a new set of APIs. Also J2ME applications (called Midlets) don't have a main() method. I suggest getting a book to learn with. I've been using Core J2ME, but others here have suggested Wireless J2ME, the book that's up for the giveaway this week.
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I suspect you'll pick up the programming part quickly - though it may take a bit to get all the differences in the APIs (like java.lang and straight.
My feeling is that the toughest part will be getting used to the constraints of low memory, small screens, limited input mechanisms. I'm also doing J2EE, but I started off programming Apple ][ computers with 48K of RAM and a 142K disk for storage. There's a different mindset when designing a solution and if you've never had to deal with such limits then it may be the toughest part.
Think small, think minimalistic. Nothing flashy until the guts of the solution are in place...
I may be totally off base here, but its how I see it.
Good luck,
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