J2ME Interview Questions & Answers

Q : What is J2ME ?
A : Java 2 Micro Edition(J2ME) is a group of specifications and technologies that pertain to Java on small devices. The J2ME moniker covers a wide range of devices, from the pagers and mobile telephones through the set-top boxes and car navigation systems. The J2ME world is divided into the configurations and profiles, specifications that describe a Java environment for a specific class of device.

Q : What is the Generic Connection Framework ?
A : The Generic Connection Framework (GCF) makes it is very easy for wireless devices to make the network connections. It is part of a CLDC and CDC and resides in the javax.microedition.io package.

Q : What is a RMI ?
A : Remote method invocation (RMI) is a feature of J2SE that enables to the Java objects running in one virtual machine to invoke the methods of Java objects running in another virtual machine, seamlessly.

Q : What’s WDP?
A : Wireless Datagram Protocol (WDP)is worked as the transport layer of WAP. WDP processes datagrams from the upper layers to formats required by the different physical datapaths like GSM SMS or CDMA Packet Data. WDP is adapted to the bearers available in the device so upper layers do not need to the care about the physical level.

Q : What is JCP ?
A : The Java Community Process (JCP) is an open the organization of international Java developers and licensees who develop and revise Java technology specifications, reference the implementations, and technology compatibility kits through a formal process.

Q : What is a OTA ?
A : Over The Air (OTA) refers to any the wireless networking technology.

Q : What is kXML ?
A : The kXML project provides a small of footprint XML parser that can be used with the J2ME.

Q : What is PCS ?
A : Personal Communications Service (PCS) is a suite of second-generation, digitally modulated mobile-communications the interfaces that includes TDMA, CDMA, and GSM. PCS serves as an umbrella term for the second-generation wireless technologies operating in the 1900MHz range.

Q :What is the Personal Profile ?

A The Personal Profile is a J2ME profile the 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).

Q : What is TDMA ?
A: Time Division Multiple Access (TDMA) is a second-generation modulation standard using bandwidth the allocated in the 800 MHz, 900 MHz, and 1900MHz ranges.

Q : What is WTLS ?
A : 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).

Q : What ‘s WTP ?
A : 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.

Q : What is WMLScript
A : WMLScript is a subset of the JavaScript scripting language designed to as part of the WAP standard to provide a convenient mechanism to access the mobile phone's peripheral functions.