Technical Round Materials-J2ME-Free Download
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
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
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
What is ETSI ?
The European Telecommunications Standards Institute (ETSI) is a non-profit
organization that establishes telecommunications standards for Europe.
What is FDMA ?
Frequency-division multiple-access (FDMA) is a mechanism for sharing a
radio frequency band among multiple users by dividing it into a number of
What is Foundation Profile ?
The Foundation Profile is a J2ME profile specification that builds on CDC.
It adds additional classes and interfaces to the CDC APIs but does not go
so far as to specify user interface APIs, persistent storage, or
application life cycle. Other J2ME profiles build on the CDC/Foundation
combination: for example, the Personal Profile and the RMI Profile both
build on the Foundation Profile.
What is Generic Connection Framework ?
The Generic Connection Framework (GCF) makes it easy for wireless devices
to make network connections. It is part of CLDC and CDC and resides in the
What is GPRS ?
The General Packet Radio System (GPRS) is the next generation of GSM. It
will be the basis of 3G networks in Europe and elsewhere.
What is GSM ?
The Global System for Mobile Communications (GSM) is a wireless network
system that is widely used in Europe, Asia, and Australia. GSM is used at
three different frequencies: GSM900 and GSM1800 are used in Europe, Asia,
and Australia, while GSM1900 is deployed in North America and other parts
of the world.
What is HLR ?
The Home Location Register (HLR) is a database for permanent storage of
subscriber data and service profiles.
What is HTTPS ?
Hyper Text Transfer Protocol Secure sockets (HTTPS) is a protocol for
transmission of encrypted hypertext over Secure Sockets Layer.
What is i-appli ?
Sometimes called "Java for i-mode", i-appli is a Java environment based on
CLDC. It is used on handsets in NTT DoCoMo's i-mode service. While i-appli
is similar to MIDP, it was developed before the MIDP specification was
finished and the two APIs are incompatible.
What is IDE ?
An Integrated Development Environment (IDE) provides a programming
environment as a single application. IDEs typically bundle a compiler,
debugger, and GUI builder tog ether. Forte for Java is Sun's Java IDE.
What is iDEN ?
The Integrated Dispatch Enhanced Network (iDEN) is a wireless network
system developed by Motorola. Various carriers support iDEN networks around
the world: Nextel is one of the largest carriers, with networks covering
North and South America.
What is i-mode ?
A standard used by Japanese wireless devices to access cHTML (compact HTML)
Web sites and display animated GIFs and other multimedia content.
What is 3G ?
Third generation (3G) wireless networks will offer faster data transfer
rates than current networks. The first generation of wireless (1G) was
analog cellular. The second generation (2G) is digital cellular, featuring
integrated voice and data communications. So-called 2.5G networks offer
incremental speed increases. 3G networks will offer dramatically improved
data transfer rates, enabling new wireless applications such as streaming
What is 3GPP ?
The 3rd Generation Partnership Project (3GPP) is a global collaboration
between 6 partners: ARIB, CWTS, ETSI, T1, TTA, and TTC. The group aims to
develop a globally accepted 3rd-generation mobile system based on GSM.
What is Java Card ?
The Java Card specification allows Java technology to run on smart cards
and other small devices. The Java Card API is compatible with formal
international standards, such as, ISO7816, and industry-specific standards,
such as, Europay/Master Card/Visa (EMV).
What is JavaHQ ?
JavaHQ is the Java platform control center on your Palm OS device.
What is JCP ?
The Java Community Process (JCP) an open organization of international Java
developers and licensees who develop and revise Java technology
specifications, reference implementations, and technology compatibility
kits through a formal process.
What is JDBC for CDC/FP ?
The JDBC Optional Package for CDC/Foundation Profile (JDBCOP for CDC/FP) is
an API that enables mobile Java applications to communicate with relational
database servers using a subset of J2SE's Java Database Connectivity. This
optional package is a strict subset of JDBC 3.0 that excludes some of
JDBC's advanced and server-oriented features, such as pooled connections
and array types. It's meant for use with the Foundation Profile or its
What is JSR
Java Specification Request (JSR) is the actual description of proposed and
final specifications for the Java platform. JSRs are reviewed by the JCP
and the public before a final release of a specification is made.
What is KittyHawk
KittyHawk is a set of APIs used by LG Telecom on its IBook and p520
devices. KittyHawk is based on CLDC. It is conceptually similar to MIDP but
the two APIs are incompatible.
What is KJava
KJava is an outdated term for J2ME. It comes from an early package of Java
software for PalmOS, released at the 2000 JavaOne show. The classes for
that release were packaged in the com.sun.kjava package.
What is kSOAP
kSOAP is a SOAP API suitable for the J2ME, based on kXML.
What is kXML
The kXML project provides a small footprint XML parser that can be used
What is KVM
The KVM is a compact Java virtual machine (JVM) that is designed for small
devices. It supports a subset of the features of the JVM. For example, the
KVM does not support floating-point operations and object finalization. The
CLDC specifies use of the KVM. According to folklore, the 'K' in KVM stands
for kilobyte, signifying that the KVM runs in kilobytes of memory as
opposed to megabytes.
What is LAN
A Local Area Network (LAN) is a group of devices connected with various
communications technologies in a small geographic area. Ethernet is the
most widely-used LAN technology. Communication on a LAN can either be with
Peer-to-Peer devices or Client-Server devices.
What is LCDUI
LCDUI is a shorthand way of referring to the MIDP user interface APIs,
contained in the javax.microedition.lcdui package. Strictly speaking, LCDUI
stands for Liquid Crystal Display User Interface. It's a user interface
toolkit for small device screens which are commonly LCD screens.
What is MExE
The Mobile Execution Environment (MExE) is a specification created by the
3GPP which details an applicatio n environment for next generation mobile
devices. MExE consists of a variety of technologies including WAP, J2ME,
CLDC and MIDP.
What is MIDlet
A MIDlet is an application written for MIDP. MIDlet applications are
subclasses of the javax.microedition.midlet.MIDlet class that is defined by
What is MIDlet suite
MIDlets are packaged and distributed as MIDlet suites. A MIDlet suite can
contain one or more MIDlets. The MIDlet suite consists of two files, an
application descriptor file with a .jad extension and an archive file with
a .jar file. The descriptor lists the archive file name, the names and
class names for each MIDlet in the suite, and other information. The
archive file contains the MIDlet classes and resource files.
What is MIDP
The Mobile Information Device Profile (MIDP) is a specification for a J2ME
profile. It is layered on top of CLDC and adds APIs for application life
cycle, user interface, networking, and persistent storage.
What is MIDP-NG
The Next Generation MIDP specification is currently under development by
the Java Community Process. Planned improvements include XML parsing and
What is Mobitex
Mobitex is a packet-switched, narrowband PCS network, designed for
wide-area wireless data communications. It was developed in 1984 by Eritel,
an Ericsson subsidiary, a nd there are now over 30 Mobitex networks in
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
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
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
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
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.
What is Provisioning ?
In telecommunications terms, provisioning means to provide
telecommunications services to a user. This includes providing all
necessary hardware, software, and wiring or transmission devices.
What is PSTN ?
The public service telephone network (PSTN) is the traditional, land-line
based system for exchanging phone calls.
What is RMI
Remote method invocation (RMI) is a feature of J2SE that enables Java
objects running in one virtual machine to invoke methods of Java objects
running in another virtual machine, seamlessly.
What is RMI OP
The RMI Optional Package (RMI OP) is a subset of J2SE 1.3's RMI
functionality used in CDC-based profiles that incorporate the Foundation
Profile, such as the Personal Basis Profile and the Personal Profile. The
RMIOP cannot be used with CLDC-based profiles because they lack object
serialization and other important features found only in CDC-based
profiles. RMIOP supports most of the J2SE RMI functionality, including the
Java Remote Method Protocol, marshalled objects, distributed garbage
collection, registry-based object lookup, and network class loading, but
not HTTP tunneling or the Java 1.1 stub protocol.
What is RMI Profile
The RMI Profile is a J2ME profile specification designed to support Java's
Remote Method Invocation (RMI) distributed object system. Devices
implementing the RMI Profile will be able to interoperate via RMI with
other Java devices, including Java 2, Standard Edition. The RMI Profile is
based on the Foundation Profile, which in turn is based on CDC.
What is RMS
The Record Management System (RMS) is a simple record-oriented database
that allows a MIDlet to persistently store information and retrieve it
later. Different MIDlets can also use the RMS to share data.
What is SDK
A Software Development Kit (SDK) is a set of tools used to develop
applications for a particular platform. An SDK typically contains a
compiler, linker, and debugger. It may also contain libraries and
documentation for APIs.
What is SIM
A Subscriber Identity Module (SIM) is a stripped-down smart card containing
information about the identity of a cell-phone subscriber, and subscriber
authentication and service information. Because the SIM uniquely identifies
the subscriber and is portable among handsets, the user can move it from
one kind of phone to another, facilitating international roaming.
What is SMS
Short Message Service (SMS) is a point-to-point service similar to paging
for sending text messages of up to 160 characters to mobile phones.
What is SOAP
The Simple Object Access Protocol (SOAP) is an XML- based protocol that
allows objects of any type to communicated in a distributed environment.
SOAP is used in developing Web Services.
What is SSL
Secure Sockets Layer (SSL) is a socket protocol that encrypts data sent
over the network and provides authentication for the socket endpoints.
What is T9
T9 is a text input method for mobile phones and other small devices. It
replaces the "multi-tap" input method by guessing the word that you are
trying to enter. T9 may be embedded in a device by the manufacturer. Note
that even if the device supports T9, the Java implementation may or may not
use it. Check your documentation for details.
What is TDMA
Time Division Multiple Access (TDMA) is a second-generation modulation
standard using bandwidth allocated in the 800 MHz, 900 MHz, and 1900MHz
What is Telematics
Telematics is a location-based service that routes event notification and
control data over wireless networks to and from mobile devices installed in
automobiles. Telematics makes use of GPS technology to track vehicle
latitude and longitude, and displays maps in LED consoles mounted in
dashboards. It connects to remote processing centers that turn provide
server-side Internet and voice services, as well as access to database
What is Tomcat ?
Tomcat is a reference implementation of the Java servlet and JavaServer
Pages (JSP) specifications. It is intended as a platform for developing and
What is UDDI ?
Universal Description, Discovery, and Integration (UDDI) is an XML-based
standard for describing, publishing, and finding Web services. UDDI is a
specification for a distributed registry of Web services.
What is UMTS
Developed by Nortel Networks, Universal Mobile Telecommunications Service
(UMTS) is a standard that will provide cellular users a consistent set of
technologies no matter where they are located worldwide. UMTS utilizes
What is VLR
The Visitor Location Register (VLR) is a database that contains temporary
information about subscribers.
What is WAE
The Wireless Application Environment (WAE) provides a application framework
for small devices. WAE leverages other technologies such as WAP, WTP, and
What is WAP
Wireless Application Protocol (WAP) is a protocol for transmitting data
between servers and clients (usually small wireless devices like mobile
phones). WAP is analogous to HTTP in the World Wide Web. Many mobile phones
include WAP browser software to allow users access to Internet WAP sites.
What is WAP Gateway
A WAP Gateway acts as a bridge allowing WAP devices to communicate with
other networks (namely the Internet).
What is W-CDMA
Wideband Code-Division Multiple Access (W-CDMA), also known as IMT-2000, is
a 3rd generation wireless technology. Supports speeds up to 384Kbps on a
wide-area network, or 2Mbps locally.
What is WDP
Wireless Datagram Protocol (WDP) works as the transport layer of WAP. WDP
processes datagrams from upper layers to formats required by different
physical datapaths, bearers, that may be for example GSM SMS or CDMA Packet
Data. WDP is adapted to the bearers available in the device so upper layers
don't need to care about the physical level.
What is WMA
The Wireless Messaging API (WMA) is a set of classes for sending and
receiving Short Message Service messages. See also SMS.
What is WML
The Wireless Markup Language (WML) is a simple language used to create
applications for small wireless devices like mobile phones. WML is
analogous to HTML in the World Wide Web.
What is WMLScript
of the WAP standard to provide a convenient mechanism to access mobile
phone's peripheral functions.
What is WSP
Wireless Session Protocol (WSP) implements session services of WAP.
Sessions can be connection-oriented and connectionless and they may be
suspended and resumed at will.
What is WTLS
Wireless Transport Layer Security protocal (WTLS) does all cryptography
oriented features of WAP. WTLS handles encryption/decryption, user
authentication and data integrity. WTLS is based on the fixed network
Transport Layer Security protocal (TLS), formerly known as Secure Sockets
What is WTP
Wireless Transaction Protocol (WTP) is WAP's transaction protocol that
works between the session protocol WSP and security protocol WTLS. WTP
chops data packets into lower level datagrams and concatenates received
datagrams into useful data. WTP also keeps track of received and sent
packets and does re-transmissions and acknowledgment sending when needed.
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