#4 Java / J2EE

Java is a general-purpose, concurrent, class-based, object-oriented computer programming language that is specifically designed to have few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA), meaning that code that runs on one platform does not need to be recompiled to run on another.

Java Platform, Enterprise Edition or Java EE is Oracle's enterprise Java computing platform. The platform provides an API and runtime environment for developing and running enterprise software, including network and web services, and other large-scale, multi-tiered, scalable, reliable, and secure network applications.

Java and the J2EE development platform are popping up more and more on job hiring boards and they will be high in demand throughout 2013, according to a survey from Dice.

Unlike hot new technologies like Android development and HTML5, demand for Java skills has been fairly consistent over time, although it has been on the rise in the last few years.

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