Differentiate between JDK ,JRE & JVM in java?

Question

I am using IntelliJ IDEA 13.1.4 and also tried the latest release 14.
Running SBT I get the following error:
Error:Cannot determine Java VM executable in selected JDK
I have JDK 1.7 installed on my machine and on PATH.

Answer 1

JDK means Java Development Kit which contains tools and programs needed to develop the Java programs, and JRE to run the programs. The tools include compiler (javac.exe), Java application launcher (java.exe), Appletviewer, etc… Compiler converts java code into byte code. Java application launcher opens a JRE, loads the class, and invokes its main method.

Now coming to JVM i.e. Java Virtual Machine, as I said when we compile a Java file, output is a ‘.class’ file which consists of Java byte codes which are understandable by JVM. Java Virtual Machine interprets the byte code into the machine code depending upon the underlying operating system and hardware combination.

Read more at: http://tech.queryhome.com/67790/what-is-the-difference-between-jdk-and-jvm

Answer 2

JDK:

stands for Java Development Kit.

USES:
It is the most widely used Java Software Development Kit.

JRE:

stands for Java Runtime Environment

USES:
It is an implementation of the Java Virtual Machine which executes Java programs

JVM

stands for Java Virtual Machine

USES:
It is an interpreter.