Jun 11, 2010

20 Things every java developer must know

Java technology has evolved and has become really huge in last decade. There are just too many things and its almost impossible for one person to master all of them. Your knowledge about Java technology will depend completely on what you working on.

In any technology say Java or some other language, it is more important and valuable to know the language fundamentals thoroughly (OOP concepts, interfaces, class, objects, threading etc.) rather than specific frameworks or syntax. It's always easy to quickly learn new technologies when you master the fundamentals.


Java developers knowledge expectation changes based on the profile. In this post I have divided it into 3 profiles:
1. College Graduate,
2. Experienced Java Developer,
3. Experienced Java Web Developer.


7 Things a College graduate must know to get a Java developer job


If you are a college graduate with no job experience then as a Java developer you need to understand the following basic things.




1) How Java Virtual Machine works? e.g. (Platform Independance, Garbage Collection, class files etc)


2) What are the Object Oriented Programming Concepts Implemented in Java?


3) Multi threading


4) Java Collection framework


5) Good understanding of data types and few java.lang classes like String, Math, System etc. java.io stream concepts.


6) Understand concept of Swing/AWT event based programming


7) Servlets & JSP concepts.


9 Things an experienced Java Developer must know to thrive



If you are a experienced professional then as a Java developer you may also need to understand the following basic things in addition to the ones listed above.




1) Understand design patterns and its usage in Java


2) Improvements on language from major version changes (Generics, Annotations, Enums, ...).


3) Coding Conventions.


4) Build tool (Ant) or Project Management Tool (Maven).


5) Verion control System like CVS/SVN/Perforce/Clearcase.


6) Apache Commons Libraries & few other common open source libraries.


7) Continuous Integration Tools and Unit testing.


8) Fundamental understanding of XML


9) Understand Business layer frameworks - like Spring


4 Things a Java Web Developer (JEE) Developer must know


If you are a experienced professional working on Web based development then as a JEE developer you also need to understand the following basic things in addition to the ones (7+9) listed above.




1) Understanding of MVC Frameworks - Open source J2EE frameworks like - Struts, Webwork, Spring MVC, Tapestry.


2) Fundamental understanding of Web Services


3) Good understanding of Web/Application server like Tomcat, Glassfish, WebLogic, WebSphere, Jetty etc.


4) Unix environment - A working knowledge of Unix environment can be benifitial as most of the Java servers are hosted on unix based environemnt in production.




Looking at the list of things it really feels difficult for a person to know each and everything in depth. As I already said it is more important and valuable to know the language fundamentals thoroughly and rest can be learned quickly when required.
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