J2SE Interview Questions & Answers

Showing 10 of 237 questions | Page 14

Technical interview questions and answers are essential for J2SE Interviews because core Java concepts form the foundation of all Java-based development. Companies test your knowledge of OOP principles, exceptions, packages, JVM architecture, threading, collections, and file handling. These topics commonly appear in placement drives and technical interviews conducted by TCS, Infosys, Wipro, Cognizant, and Capgemini. Understanding J2SE concepts helps freshers and job seekers prepare for both Java developer roles and advanced J2EE/Java EE interviews. This guide features the most commonly asked J2SE interview questions with answers explained in simple language. Preparing these questions will strengthen your Java basics and improve your performance in coding tests and technical rounds.

Java programmers should advance their enterprise skills by studying J2EE frameworks and mastering EJB components for distributed applications

Showing 10 of 237 questions

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131. What is JavaSpaces ?

A technology that provides distributed persistence and data exchange mechanisms for code in Java.

132. What is JDBC ?

Java Database Connectivity.

133. What is JDK ?

Java Development Kit. A software development environment for writing applets and application in Java .

134. What is JFC ?

Java Foundation Classes.

135. What is Jini Technology ?

A set of Java APIs that may be incorporated an optional package for any Java 2 Platform Edition. The Jini APIs enable transparent networking of devices and services and eliminates the need for system or network administration intervention by a user. The Jini technology is currently an optional package available on all Java platform editions.

136. What is JNDI ?

Java Naming and Directory Interface.

137. What is JNI ?

Java Native Interface.

138. What is JRE ?

Java Runtime Environment

139. What is Just-in-time (JIT) Compiler ?

A compiler that converts all of the bytecode into native machine code just as a Java program is run. This results in run-time speed improvements over code that is interpreted by a Java virtual machine.

140. What is JVM ?

Java Virtual Machine (JVM).