400+ Java Interview Questions and Answers - Must See (pdf)

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Java – Interview questions & answers Covers the following

•  Language Fundamentals LF
•  Design Concepts DC
•  Design Patterns DP
•  Concurrency Issues CI
•  Performance Issues PI
•  Memory Issues MI
•  Exception Handling EH
•  Security SE
•  Scalability Issues SI

Q 01: Give a few reasons for using Java? LF DC

A 01: Java is a fun language. Let’s look at some of the reasons:

 Built-in support for multi-threading, socket communication, and memory management (automatic garbage

collection).

•  Object Oriented (OO).
•  Better portability than other languages across operating systems.
•  Supports Web based applications (Applet, Servlet, and JSP), distributed applications (sockets, RMI. EJB etc) and network protocols (HTTP, JRMP etc) with the help of extensive standardised APIs (Application Program Interfaces).

Q 02: What is the main difference between the Java platform and the other software platforms? LF

A 02: Java platform is a software-only platform, which runs on top of other hardware-based platforms like UNIX, NT etc.

The Java platform has 2 components:
 Java Virtual Machine (JVM) – ‘JVM’ is a software that can be ported onto various hardware platforms. Byte
codes are the machine language of the JVM.
 Java Application Programming Interface (Java API) -

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