Difference between trunk tags and branches in SVN or Subversion source control system

SVN or Subversion is one of the popular source control system used in Java world for source code management. There are lot of source control system available e.g. Git, Perforce, CVS, Clearcase, VSS, but SVN has it’s own place among Java developer and open source communities. Knowledge of source control system is must for any professional programmer. New users of subversion often confused between three things trunk, tags and branches. Questions like, what is difference between a tag and a branch in subversion is frequently asked in various Java forums and chat rooms. In this article, we will see what is trunk, tags or branches in SVN and understand difference between trunk, tag and branch. In short, when you first upload your project to SVN it creates a trunk, It's analogous to trunk of tree. this trunk forms the main development line. When multiple developer work on different functionality of project they usually create branch from trunk and after successfully completing that functionality, they usually merge there changes to trunk. On the other hand tag is usually used to create read only snapshot of either trunk or branch, which has been released, for future use. You can think tag as stable snapshot of code at any point, and can be used to as backup or restore. Let's see difference between branch, trunk and tag more detail in next section.

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Difference between linked list and array data structure in Java Programming

Array and linked list are two fundamental data structure in programming world. Almost all programs use Array in some form or other, which makes it increasingly important to learn array and linked list. Difference between linked list and array data structure is also a popular data structure question, frequently asked in various programming job interview. This makes it even more important to learn and understand difference between an array and a linked list. Well there are lot of difference between these two starting from how they store data, to how you retrieve data from them. Main difference comes from the fact that array elements are stored in contiguous memory location, which makes it easy to retrieve them in quick time, while linked list elements are scattered through out memory, where one element knows address of other, it makes it hard to retrieve element from linked list in quick time. Some of the differences which we saw in ArrayList vs LinkedList also applicable at data structure level, because ArrayList is backed by array and LinkedList is internally backed by double linked list in Java. In this tutorial, we will learn differences between these two fundamental data structure in more details. Once you know the difference, you can make a concise choice of which data structure suits your need better. Since both of them offers distinctive advantage over others, in terms of speed and flexibility, You can make an informed choice based upon your need.

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5 Difference between Application Server and Web Server in Java

Application server and web server in Java both are used to host Java web application. Though both application server and web server are generic terms, difference between application server and web server is a famous J2EE interview question. On  Java J2EE perspective main difference between web server and application server is support of EJB. In order to run EJB or host enterprise Java application (.ear) file you need an application server like JBoss, WebLogic, WebSphere or Glassfish, while you can still run your servlet and JSP or java web application (.war) file inside any web server like Tomcat or Jetty.

This Java interview question are in continuation of my previous post on interviews like Top 10 Spring interview questions and  Top 10 Struts interview question.  Here we will see some difference between application server and web server in point format which will help you to answer this question in any java interview.

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