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JVM is an implementation of JRE. So every device which has JVM will contain JRE right?
JDK contains Set of classes and Libraries which support Development. Does JRE contains the Same. If so why they need the same since we already have our code converted to byte code?
Please correct me if I am wrong
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Role of the JRE in Java programming language JVMs are available for multiple operating systems, and the JRE generates a single copy of your Java code that runs on all types of JVMs. In this way, the JRE facilitates platform independence for Java applications. You can write them once and run them anywhere.
An implementation: JVM implementation is known as JRE (Java Runtime Environment) i.e. it creates a corresponding environment for the execution of code by implementing the specifications which are defined in JVM. JRE consists of java binaries and other classes to execute the program.
You can't run Java program without JVM. JVM is responsible in running a Java program, but the only file that can be executed by JVM is Java bytecode, a compiled Java source code.
JRE identifies all the helpful class libraries needed for execution, while JVM is a subclass of JRE that decodes the bytecode into machine language and other minor tasks. JVM and JRE do not participate in development processes like debugging and compiling; JDK is used for them.
You have number 1 a little backward. The Java Runtime Environment (JRE) contains a Java Virtual Machine (JVM), along with the standard java libraries and other things which allow Java byte-code programs to run.
The JDK Java Development Kit is like a superset of the JRE. It has all the things a JRE has, but adds things like a compiler and debugger to allow you to not only run Java byte-code, but create it from Java source files.
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