JAVA / J2EE / MAIN FRAME
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JAVA
Java is a general-purpose computer-programming language that is concurrent, class-based, object-oriented,[15] and specifically designed to have as few implementation dependencies as possible. It is intended to let application developers “write once, run anywhere” (WORA),[16] meaning that compiled Java code can run on all platforms that support Java without the need for recompilation.
Java is among the most popular programming languages out there, thanks to its versatility and compatibility. Java is used for software development, mobile applications, and large systems development.
J2EE
J2EE is a platform-independent, Java-centric environment from Sun for developing, building and deploying Web-based enterprise applications online. The J2EE platform consists of a set of services, APIs, and protocols that provide the functionality for developing multi-tiered, Web-based applications.
J2EE technologies are Java Servlets, Java Server Pages (JSP), Enterprise JavaBeans (EJB) and the Java Message Service (JMS). Following on from this, we’ll move on to take a look at J2EE from an architecture and design perspective, covering topics like best practices and design patterns.
MAINFRAME
A mainframe is a high-performance computer used for large-scale computing purposes that require greater availability and security than a smaller-scale machine can offer. Mainframes have been associated with centralized rather than distributed computing, although that distinction is blurring as smaller computers become more powerful and mainframes become more multi-purpose.