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STUTTGART

TECHNIK

Background 

        STUTTGART UNIVERSITY OF APPLIED 

SCIENCES 

2.5  J2ME 

2.5.1  What is J2ME? 

J2ME  is  a  lean  Java  platform  targeted  specifically  at  applications  running  on  small 

devices such as mobile phones, PDAs, Internet screenphones, digital television set top 

boxes,  as  well  as  a  broad  range  of  embedded  devices.  Like  its  counterparts  for  the 

enterprise  (J2EE),  desktop  (J2SE)  and  smart  card  (Java  Card)  environments,  J2ME 

includes  Java  virtual  machines  and  a  set  of  standard  Java  APIs  defined  through  the 

Java  Community  Process  (JCP)  by  an  expert  group  of  more  than  50  companies, 

including  leading  device  manufacturers,  wireless  carriers,  and  vendors  of  mobile 

software. 

J2ME delivers the power and benefits of Java technology to consumer and embedded 

devices. It includes flexible user interfaces, a robust security model, a broad range of 

built in network protocols, and extern support for networked and offline applications 

that can be downloaded dynamically.  Applications based on J2ME specifications are 

written once for a wide range of devices, also exploit each device s native capabilities. 

The  J2ME  platform  is  deployed  on  millions  of  devices,  supported  by  leading  tool 

vendors, and used by companies worldwide. In short, it is the platform of choice  for 

today s consumer and embedded devices. 

2.5.2  The J2ME Architecture 

The  J2ME  architecture  comprises  a  variety  of  configurations,  profiles,  and  optional 

packages  that  implementers  and  developers  can  choose  from,  and  combine  to 

construct a complete Java runtime environment that closely fits the requirements of a 

particular range of devices and a target market. Each combination is optimized for the 

memory, processing power, and I/O capabilities of a related category of devices. The 

result  is a common  Java platform that takes full  advantage of each type of device to 

deliver a rich user experience.   

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