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J2ME Interview Questions And Answers

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Class File verification is used by Java Virtual Machine (JVM) before full startup of the JVM occurs in running bytecode of an application. This can be done in four Passes- 

Pass-1:- Check byte code attributes, magic number, constant pool must not have any superficial data, and class file must not have extra bytes at end.

Pass-2:- Check every class behaviour and attribute and every class has valid names, classes, descriptor, and packages.

Pass-3:- Check code linking, attribute, and analysis data flow.

Pass-4:- Check where class loading occurs to finalize the class verification process.

The Sun Microsystems (now subsidiary of Oracle) devide java into three editions- J2SE, J2EE, J2ME, each having own software development Kit(SDK) .

1. J2SE- Java 2 Standard Edition. This edition consists of application programming interfaces (APIs) needed to build aJava application or applet.

2. J2EE- Java 2 Enterprise Edition. This edition consists of application programming interfaces (APIs) needed to build a application for access server-side systems.

3. J2ME- Java 2 Micro Edition. This edition consists of application programming interfaces (APIs) needed to build a applications for small computing devices, including wireless Java applications.

Java ME devices implement a Profiles, common of these are the Mobile Information Device Profile (MIDP) which include Mobile devices (such as such as Smartphone, cell phones, and Personal Profile) and Embedded systems (such as Set- top boxes and Personal digital assistant (PDAs)). Profiles are specific and subsets of Configurations, these are of currently two type, Connected Device Configuration (CDC) and the Connected Limited Device Configuration (CLDC).


A MIDlet is a MID Profile application. A J2ME Midlet's main class must extends javax.microedition.midlet.MIDlet. This class define three life-cycle notification methods:

startApp()

pauseApp()

destroyApp().


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J2ME Objective Questions And Answers

J2ME Objective Questions And Answers

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