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I am not able to find proper explanation. I could find reasons for why JVM is called virtual machine but not for why jre is not called as virtual machine . Please help.

adwaita jadhav
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    Does this answer your question? [What is the difference between JVM, JDK, JRE & OpenJDK?](https://stackoverflow.com/questions/11547458/what-is-the-difference-between-jvm-jdk-jre-openjdk) – Janez Kuhar Oct 04 '21 at 13:32
  • The JVM is to the JRE what the motor is to a car: it is a part of it. And while the JVM is a virtual machine we don't call the JRE a virtual machine for similar reasons as we don't say a car is a motor. – Thomas Kläger Oct 04 '21 at 14:08
  • Hi adwaita, Have you seen my answer? Did you find it helpful? I'll be so happy to give me some feedbacks, cheers. – Behdad Abdollahi Moghadam Oct 05 '21 at 06:16

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The differences of JVM and JRE , including the reason why JVM is not called a virtual machine as opposed to JVM:

  • The JRE is an abbreviation for Java Runtime Environment, where as the The JVM is an abbreviation for Java Virtual Machine.

  • Defenition:
    • The Java Runtime Environment (JRE) is an implementation of JVM.
      It is a type of software package that provides class libraries of
      Java, JVM, and various other components for running the
      applications written in Java programming.
    • The Java Virtual Machine (JVM) is a platform-independent abstract machine that has three notions in the form of specifications.
  • Funcionality:
    • JRE has a major responsibility for creating an environment for the execution of code.
    • JVM specifies all of the implementations. It is responsible for providing all of these implementations to the JRE.

I hope you understood why JRE is not called a virtual machine.

Behdad Abdollahi Moghadam
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