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2.2.2
 
Mobile Information Device Profile 
The Mobile Information Device (MID) Profile (MIDP)[6] is a key element of the J2ME. 
Combining MIDP with CLDC provides a standard Java runtime environment for mobile 
information devices such as cell phones and Personal Digital Assistants (PDAs). MIDP 
2.0 is based on MIDP 1.0 which provides a standard API for application development. 
MIDP 2.0 includes many enhancements and additions. Some of these are secure 
networking, multimedia and gaming. 

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2.2 Background information: : Java 2 Platform, Micro Edition 
Page 5 of 93 
2.2.2.1
 
Architecture 
The goal of MIDP is to create an open, third-party application environment for MIDs. 
Figure 2-2 as shown in[6] below describes a typical architecture, but it is only a 
suggestion on how the architecture may look like. A device that implements MIDP does 
not necessarily need all elements shown in the figure. Neither does the device need to 
layer the elements and software exactly as shown in the figure. 
The lowest part in the figure is the MID hardware. On top of that is the Native System 
Software which includes the operating system and libraries used by the device. Above the 
Native System Software is the CLDC, which represents the Virtual Machine and 
associated libraries. CLDC provides the underlying Java functionality upon which higher-
level Java APIs may be built. On top of the CLDC we find two different APIs. These are 
the MIDP API and an Original Equipment Manufacturer (OEM)-specific API. The three 
last blocks on the figure represent the application types possible on a MID, which are 
MIDP applications, OEM-specific applications, and native applications. 
Figure 2-2: J2ME architecture 
2.2.2.2