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J2SE Interview Questions and Answers


What is int ?
A Java keyword used to define a variable of type integer.

What is interface ?
A Java keyword used to define a collection of method definitions and constant values. It can later be implemented by classes that define this interface with the "implements" keyword.

What is Internet ?
An enormous network consisting of literally millions of hosts from many organizations and countries around the world. It is physically put together from many smaller networks and data travels by a common set of protocols.

What is IP ?
Internet Protocol. The basic protocol of the Internet. It enables the unreliable delivery of individual packets from one host to another. It makes no guarantees about whether or not the packet will be delivered, how long it will take, or if multiple packets will arrive in the order they were sent. Protocols built on top of this add the notions of connection and reliability. See also TCP/IP.

What is interpreter ?
A module that alternately decodes and executes every statement in some body of code. The Java interpreter decodes and executes bytecode for the Java virtual machine1. See also compiler, runtime system.

What is JAIN ?
See: Java APIs for Integrated Networks (JAIN)

What is JAR ?
JAR (Java Archive) is a platform-independent file format that aggregates many files into one. Multiple applets written in the Java programming language, and their requisite components (.class files, images, sounds and other resource files) can be bundled in a JAR file and subsequently downloaded to a browser in a single HTTP transaction. It also supports file compression and digital signatures.

What is Java ?
A set of technologies for creating and safely running software programs in both stand-alone and networked environments.

What is Java 2 Platform ?
The second generation of the Java platform. (The first generation was the JDK.) Also see "Java Platform" and "Java Platform Editions".

What is Java 2 SDK, Standard Edition ?
The Software Development Kit (SDK) is development environment for building applications, applets, and components using the Java programming language. This SDK provides a reference implementation of the J2SE platform.

What is Java APIs for Integrated Networks (JAIN) ?
enables the rapid development of Next Generation telecom products and services on the Java platform.

What is Java Card API ?
An ISO 7816-4 compliant application environment focused on smart cards.

What is Java Compatibility Kit (JCK) ?
A test suite, a set of tools, and other requirements used to certify a Java platform implementation conformant both to the applicable Java platform specifications and to Java Software reference implementations.

What is Java Database Connectivity (JDBC) ?
An industry standard for database-independent connectivity between the Java platform and a wide range of databases. The JDBC provides a call-level API for SQL-based database access.

What is Java Development Kit (JDK) ?
A software development environment for writing applets and applications in the Java programming language. Technically, the JDK is the correct name for all versions of the Java platform from 1.0 to 1.1.x.

What is Java Foundation Classes (JFC) ?
An extension that adds graphical user interface class libraries to the Abstract Windowing Toolkit (AWT)
 

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