With the development of information technology, communication by mobile telephone becomes more and more important in our life. Originally, mobile telephone only was used to call, just like the wired telephone at home. The more popular mobile telephone is, the more important the development of mobile telephone application.becomes.This paper firstly introduces the application of mobile telephone including the background, the development, the classification and the foreground. Then some technologys such as WAP, I-Mode, GVM, BREW and J2ME were explained in detail. Base on studying the basic theory of J2ME such as the history, the frame and the character of J2ME, this paper discusses the process of programme and important technology in the development of the application of mobile telephone.
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