Java Platform, Micro Edition (Java ME) Interview Questions And Answers - DoAnswers.com

Java ME Platform represents the only truly open solution for building mobile applications for the industry. The technology allows portability of applications between platforms and investments are kept to a minimum through the possibility of reuse. The continuous platform evolution is driven by the increasing demands for capabilities and performance in the industry and assured through the definition of the platform components and APIs in the Java Community Process. The fact that the technology is open for anyone to use the community of developers creating applications for the platform is large and increasing. This assures the continuous improvement and availability of applications for the platform which in turn drives business for everybody involved in the eco-system. On top of this the platform itself represents a high performance and secure platform for mobile applications. The Java ME technology ecosystem evolves around a number of different players in the industry, all of them participating in , and influencing, the continuous improvement of the technology and platform. The end users are constantly demanding new features and capabilities to their services. The content developers adopts the user requirements and creates new appealing services with new capabilities. The OEMs creates new capable devices to host the new services and features and also creates new demands by presenting new capabilities to the end users. Carriers creates the mobile environment to host and deploy services on and also drives the exploration of new business-driving services to the end users. This constant evolution of demands and capabilities is the single most important reason for the success of the Java platform and ensures it will continue to evolve into the future needs of everyone involved in the eco-system.

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 media.

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

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.

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.

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.

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.

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.

The Compact Virtual Machine (CVM) is an optimized Java virtual machine1 (JVM) that is used by the CDC.

A deck is a collection of one or more WML cards that can be downloaded, to a mobile phone, as a single entity.

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.