Java Runtime Environment

What Does Java Runtime Environment Mean?

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.

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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.

Techopedia Explains Java Runtime Environment

JRE consists of the following components:

  • Deployment technologies, including deployment, Java Web Start and Java Plug-in.
  • User interface toolkits, including Abstract Window Toolkit (AWT), Swing, Java 2D, Accessibility, Image I/O, Print Service, Sound, drag and drop (DnD) and input methods.
  • Integration libraries, including Interface Definition Language (IDL), Java Database Connectivity (JDBC), Java Naming and Directory Interface (JNDI), Remote Method Invocation (RMI), Remote Method Invocation Over Internet Inter-Orb Protocol (RMI-IIOP) and scripting.
  • Other base libraries, including international support, input/output (I/O), extension mechanism, Beans, Java Management Extensions (JMX), Java Native Interface (JNI), Math, Networking, Override Mechanism, Security, Serialization and Java for XML Processing (XML JAXP).
  • Lang and util base libraries, including lang and util, management, versioning, zip, instrument, reflection, Collections, Concurrency Utilities, Java Archive (JAR), Logging, Preferences API, Ref Objects and Regular Expressions.
  • Java Virtual Machine (JVM), including Java HotSpot Client and Server Virtual Machines.

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.

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