Advantage of J2ME:
The J2ME architecture had to be modular and scalable due to the diversity of
target devices. To achieve this, J2ME provides a range of virtual machines, each
optimized to the different processor types and memory footprints.
J2ME advantages include improved security and consistency of applications across
platforms and devices, superior user interfaces with graphics, the ability to
function off-line out of wireless coverage, peer-to-peer networking and no
licensing expenses needed for the SDK, which means that anyone can create an
application and market it.
Disadvantage of J2ME
1. Midlet application will never mess up another application on the same device
or the device OS itself.
2. Unlike the J2SE, J2ME devices don’t have a command prompt.
3. A midlet application invoke in different manner as J2SE because it control by
Application Management Software(AMS).
4. AMS interacts with native operations of a Midlet application and controls its
life cycle. It is responsible for starting, processing, stoping and destory a
Midlets application executions.
5. It have memory is very limited, so operating speed is relatively slow.
6. As J2SE application used data persistence, J2ME is done through the Record
Management System (RMS), which operates solely on byte arrays. but it provide a
security lake.
7. Unlike J2SE, J2ME device does not support full size keyboard specially
alphanumeric sequences.