J2ME interview collections - Need to develop tech in J2me

[karthick]

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KJava is an outdated term for J2ME.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 with J2ME.

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 MIDP.

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 cryptographic support.

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 operation worldwide.

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.

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 ranges.

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 resources.

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 testing servlets.

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 W-CDMA technology.

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 WSP.

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

WMLScript is a subset of the JavaScript scripting language designed as part 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 Layer (SSL).

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.