What Is Java 2 Runtime?
The Java Runtime Environment (JRE) is software containing all of the files and applications required to run applets and applications written in the Java programming language. Java 2 refers to the Java 2 Platform, Standard Edition (J2SE).
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History
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Java was originally released in 1995 by Sun Microsystems. The first version released under the title Java 2 was Java 1.2 in 1998.
Function
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JRE includes the Java Virtual Machine (JVM), which runs Java applets and programs, and the files used by Java programmers to employ functionality built into the Java platform.
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Features
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The Java programming language is a multiplatform programming language. Java programs can run on any computer that has JRE installed. Supported operating systems include Windows, Macintosh, Solaris and various flavors of Linux.
Versions
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The term Java 2 was used for versions 1.2 through 1.4. Starting with version 1.5, Sun changed the title to J2SE 5.0. With version 1.6, the "2" was dropped, and J2SE was renamed Java SE.
Identification
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Running the command "java -version" on the command line outputs the current full version number of the JRE (e.g., 1.6.0_17 for Java 6 Update 17). In software managers, the JRE will be listed as "Java 2 Runtime Environment, SE" (versions 1.2 through 1.4); "J2SE Runtime Environment 5" (version 1.5); or "Java (TM) 6" (version 1.6).
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References
Resources
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