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J2ME Interview Questions and Answers
What is Modulation ?
Modulation is the method by which a high-frequency
digital signal is grafted onto a lower-frequency analog
wave, so that digital packets are able to ride piggyback
on the analog airwave.
What is MSC ?
A Mobile Switching Center (MSC) is a unit within a
cellular phone network that automatically coordinates
and switches calls in a given cell. It monitors each
caller's signal strength, and when a signal begins to
fade, it hands off the call to another MSC that's better
positioned to manage the call.
What is Obfuscation
Obfuscation is a technique used to complicate code.
Obfuscation makes code harder to understand when it is
de-compiled, but it typically has no affect on the
functionality of the code. Obfuscation programs can be
used to protect Java programs by making them harder to
reverse-engineer.
What is optional package
An optional package is a set of J2ME APIs providing
services in a specific area, such as database access or
multimedia. Unlike a profile, it does not define a
complete application environment, but rather is used in
conjunction with a configuration or a profile. It
extends the runtime environment to support device
capabilities that are not universal enough to be defined
as part of a profile or that need to be shared by
different profiles. J2ME RMI and the Mobile Media RMI
are examples of optional packages.
What is OTA
Over The Air (OTA) refers to any wireless networking
technology.
What is PCS
Personal Communications Service (PCS) is a suite of
second-generation, digitally modulated
mobile-communications interfaces that includes TDMA,
CDMA, and GSM. PCS serves as an umbrella term for
second-generation wireless technologies operating in the
1900MHz range
What is PDAP
The Personal Digital Assistant Profile (PDAP) is a J2ME
profile specification designed for small platforms such
as PalmOS devices. You can think of PDAs as being larger
than mobile phones but smaller than set-top boxes. PDAP
is built on top of CLDC and will specify user interface
and persistent storage APIs. PDAP is currently being
developed using the Java Community Process (JCP).
What is PDC
Personal Digital Cellular (PDC) is a Japanese standard
for wireless communications.
What is PDCP
Parallel and Distributed Computing Practices (PDCP) are
often used to describe computer systems that are spread
over many devices on a network (wired or wireless) where
many nodes process data simultaneously.
What is Personal Profile
The Personal Profile is a J2ME profile specification.
Layered on the Foundation Profile and CDC, the Personal
Profile will be the next generation of PersonalJava
technology. The specification is currently in
development under the Java Community Process (JCP).
What is PersonalJava
PersonalJava is a Java environment based on the Java
virtual machine1 (JVM) and a set of APIs similar to a
JDK 1.1 environment. It includes the Touchable Look and
Feel (also called Truffle), a graphic toolkit that is
optimized for consumer devices with a touch sensitive
screen. PersonalJava will be included in J2ME in the
upcoming Personal Profile, which is built on CDC.
What is PNG
Portable Network Graphics (PNG) is an image format
offering lossless compression and storage flexibility.
The MIDP specification requires implementations to
recognize certain types of PNG images.
What is POSE
Palm OS Emulator (POSE).
What is PRC
Palm Resource Code (PRC) is the file format for Palm OS
applications.
What is preverification
Due to memory and processing power available on a
device, the verification process of classes are split
into two processes. The first process is the
preverification which is off-device and done using the
preverify tool. The second process is verification which
is done on-device.
What is profile
A profile is a set of APIs added to a configuration to
support specific uses of a mobile device. Along with its
underlying configuration, a profile defines a complete,
and usually self-contained, general-purpose application
environment. Profiles often, but not always, define APIs
for user interface and persistence; the MIDP profile,
based on the CLDC configuration, fits this pattern.
Profiles may be supersets or subsets of other profiles;
the Personal Basis Profile is a subset of the Personal
Profile and a superset of the Foundation Profile. See
also configuration, optional package.
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