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J2ME Interview Questions and Answers
What is J2ME ?
Java 2, Micro Edition is a group of specifications and
technologies that pertain to Java on small devices. The
J2ME moniker covers a wide range of devices, from pagers
and mobile telephones through set-top boxes and car
navigation systems. The J2ME world is divided into
configurations and profiles, specifications that
describe a Java environment for a specific class of
device.
What is J2ME WTK ?
The J2ME Wireless Toolkit is a set of tools that
provides developers with an emulation environment,
documentation and examples for developing Java
applications for small devices. The J2ME WTK is based on
the Connected Limited Device Configuration (CLDC) and
Mobile Information Device Profile (MIDP) reference
implementations, and can be tightly integrated with
Forte for Java
What is 802.11 ?
802.11 is a group of specifications for wireless
networks developed by the Institute of Electrical and
Electronics Engineers (IEEE). 802.11 uses the Ethernet
protocol and CSMA/CA (carrier sense multiple access with
collision avoidance) for path sharing.
What is API ?
An Application Programming Interface (API) is a set of
classes that you can use in your own application.
Sometimes called libraries or modules, APIs enable you
to write an application without reinventing common
pieces of code. For example, a networking API is
something your application can use to make network
connections, without your ever having to understand the
underlying code. 5. What is AMPS
Advanced Mobile Phone Service (AMPS) is a
first-generation analog, circuit-switched cellular phone
network. Originally operating in the 800 MHz band,
service was later expanded to include transmissions in
the 1900 MHz band, the VHF range in which most wireless
carriers operate. Because AMPS uses analog signals, it
cannot transmit digital signals and cannot transport
data packets without assistance from newer technologies
such as TDMA and CDMA.
What is CDC ?
The Connected Device Configuration (CDC) is a
specification for a J2ME configuration. Conceptually,
CDC deals with devices with more memory and processing
power than CLDC; it is for devices with an always-on
network connection and a minimum of 2 MB of memory
available for the Java system.
What is CDMA ?
Code-Division Multiple Access (CDMA) is a cellular
technology widely used in North America. There are
currently three CDMA standards: CDMA One, CDMA2000 and
W-CDMA. CDMA technology uses UHF 800Mhz-1.9Ghz
frequencies and bandwidth ranges from 115Kbs to 2Mbps.
What is CDMA One ?
Also know as IS-95, CDMA One is a 2nd generation wireless
technology. Supports speeds from 14.4Kbps to 115K bps.
What is CDMA2000 ?
Also known as IS-136, CDMA2000 is a 3rd generation
wireless technology. Supports speeds ranging from
144Kbps to 2Mbps.
What is CDPD ?
Developed by Nortel Networks, Cellular Digital Packet
Data (CDPD) is an open standard for supporting wireless
Internet access from cellular devices. CDPD also
supports Multicast, which allows content providers to
efficiently broadcast information to many devices at the
same time.
What is cHTML ?
Compact HTML (cHTML) is a subset of HTML which is
designed for small devices. The major features of HTML
that are excluded from cHTML are: JPEG image, Table,
Image map, Multiple character fonts and styles,
Background color and image, Frame and Style sheet.
What is CLDC ?
The Connected, Limited Device Configuration (CLDC) is a
specification for a J2ME configuration. The CLDC is for
devices with less than 512 KB or RAM available for the
Java system and an intermittent (limited) network
connection. It specifies a stripped-down Java virtual
machine1 called the KVM as well as several APIs for
fundamental application services. Three packages are
minimalist versions of the J2SE java.lang, java.io, and
java.util packages. A fourth package,
javax.microedition.io, implements the Generic Connection
Framework, a generalized API for making network
connections.
What is configuration ?
In J2ME, a configuration defines the minimum Java
runtime environment for a family of devices: the
combination of a Java virtual machine (either the
standard J2SE virtual machine or a much more limited
version called the CLDC VM) and a core set of APIs. CDC
and CLDC are configurations. See also profile, optional
package.
What is CVM ?
The Compact Virtual Machine (CVM) is an optimized Java
virtual machine1 (JVM) that is used by the CDC.
What is Deck ?
A deck is a collection of one or more WML cards that can
be downloaded, to a mobile phone, as a single entity.
What is EDGE ?
Enhanced Data GSM Environment (EDGE) is a new, faster
version of GSM. EDGE is designed to support transfer
rates up to 384Kbps and enable the delivery of video and
other high-bandwidth applications. EDGE is the result of
a joint effort between TDMA operators, vendors and
carriers and the GSM Alliance.
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