The J2me Related Study

J2ME has already made it's mark on cell phone market. Almost all the famous manufacturers have carried out several series of Java cell phone. In Japan, i-Mode of NTT has made it's user number being on rising all along. It is not audio service but digital service who make the most important income. Mobile devices, such as cell phone and PDA, will be our necessary tools in daily life and work. We can download programs, send mails and play wonderful games with them. But all these depend on J2ME.What this paper mainly worked on are:1. Characteristics of consume devices and embedded systemThis paper explains some basic conceptions of consume devices and embedded system. It also makes comparison between J2ME and BREW to show the beautiful future of J2ME.2. Characteristics of J2ME technicalIt introduces and analyses all the basic aspects of J2ME systematically, including J2ME architecture, J2ME configurations and profiles, KVM, J2ME security and the relationship of J2ME, J2SE and J2EE.3. The designing and implementing of J2ME based application systemIt is about the J2ME Based Mobile Police System of Aerafront InfoTech Development Inc... There are two technical shemas can be chosen, SMS based and HTTP based. After careful comparison, the author used the HTTP based shema to implement.4. Performance improving of J2ME systemThe author optimized the code structure first to decrease the code size. Then tried to translate J2ME APIs into native codes and made the speed comparison.