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The Java Runtime Environment (JRE) is a set of software tools for development of Java applications. It combines the Java Virtual Machine (JVM), platform core classes and supporting libraries.
JRE is part of the Java Development Kit (JDK), but can be downloaded separately. JRE was originally developed by Sun Microsystems Inc., a wholly-owned subsidiary of Oracle Corporation.
Also known as Java runtime.
JRE consists of the following components:
JRE 1.0 has evolved with a variety of class and package additions to the core libraries, and it has grown from a few hundred classes to several thousand in Java 2 Platform, Standard Edition (J2SE). Entirely new APIs have been introduced, and many of the original version 1.0 APIs have been deprecated. There has been a significant degree of criticism because of these massive additions.