If you want to dive deep into Java programming and become a software developer, I recommend you to learn this Java course on Udemy. How to write, compile and run a hello world Java program for beginners.Understand 9 features of Java programming language.Major versions were released after every 2 years, however the Java SE 7 took 5 years to be available after its predecessor Java SE 6, and 3 years for Java SE 8 to be available to public afterward.Since Java SE 10, new versions will be released very six months. The Oracle Java Standard Edition (SE) Development Kit (JDK) is a superset of the Java Runtime Environment (JRE), and contains everything that is in the JRE. From Java 6, the version name is Java SE X.This could make confusion for someone, so keep in mind that version 1.5 and version 5.0 are just two different version names for only one thing. Internal version is continuous from previous ones (1.5 after 1.4), but the external version has a big jump (5.0 for 1.5). From versions 1.5, Sun introduces internal and external versions.From versions 1.2 to 1.4, the platform is named as J2SE (Java 2 Standard Edition).It is a package of everything necessary to run a compiled Java program, including the Java Virtual Machine (JVM), the Java Class Library, the java command, and other infrastructure. However, it cannot be used to create new programs. Versions 1.0 and 1.1 are named as JDK (Java Development Kit). The JDK is the Java Development Kit, the full-featured SDK for Java.From the table above we can see that the naming and the version number have been changing over times:
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