How many versions of java are there?

Question

I am new to Java and I am confused about the Java frameworks. Do you need different server setups to run Java, J2EE and JSP? DOes Java make a distinction in frameworks for enterprise and non-enterprise deployments? Beans? Struts?

Can someone help me with this?

Answer 1

The most commonly used terms that correspond to your “Java versions”,

• JRE: Java Runtime Environment needed to run Java programs

• JDK: Java Development Kit, A JRE plus compiler and somme additional tools

• Java SE: Standard Edition, the API library that comes with every JRE and JDL for desktop use

• Java EE: Java Enterprise Edition, additional APIs that extend the J2SE for business use, meaning mainly server applications- this includes JSPs

• Java ME: Mobile Edition, a set of APIs for mobile devices like phones

Please do note that all of these are basically specifications, and there are implementations from different vendors. For example, you can get a J2SE 6 JDK not only from Sun, but also from IBM and Oracle.

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