Java Terminologies : Introduction
- There are some basic Java Terminologies that are used frequently. These terminologies include Java Virtual Machine(JVM), Java Run-time Environment(JRE) and Java Development Kit(JDK). So let’s discuss them in brief.
1) Java Virtual Machine (JVM)
- Heart of Java programming language.
- JVM is a program for a particular hardware and software platform that run Java technology applications.
- JVM is an abstract machine architecture specified by the JVM specification.
- JVM is responsible for converting byte-codes to machine specific code.
- In other words JVM is a platform dependent execution environment that converts Java bytecodes into machine language and executes it.
2) Java Runtime Environment (JRE)
- JRE is a run-time environment which implements JVM and provides all class libraries and other facilities necessary to execute Java programs.
- Consists of JVM, core classes and supporting files.
- JRE doesn’t contain any development tools like compiler, debugger etc.
- Platform specific.
3) Java Development Kit (JDK)
- The tools necessary to compile , document and package Java programs (Javac, Javadoc and jar) is included by JDK.
- JDK includes a complete JRE.
- Core component of Java , provides all the tools, executable and binaries required to compile, debug and execute Java programs.
- JDK = JRE + Java compiler + debugger + core classes.
- It is also a platform specific software.
|Note : Apart from these three, other common terminologies that are used in java programming languages can be checked here.|