Difference between JVM , JRE and JDK

In this lecture we will learn: What is JVM? What is JDK? What is JRE? Importance and uses of JVM, JRE, and JDK. #1 To compile the Java code, we need a tool and that tool is known as JDK ( Java Development Kit). Byte code runs on a machine so we have to convert the java code into the byte code. On installing the JDK, we get both updated JRE and JVM. #2 JVM stands for Java Virtually Machine. JVM is the space where you execute the code. JVM is used to make the Java language a platform- independent. You have to compile the code through JDK and then run the code through JVM. JVM is platform dependent and it needs to be built for a particular OS. JVM is platform-dependent. #3 JRE stands for Java Runtime Environment. JRE contains all the in-built classes and other extra files and libraries that we can use in our code. JRE validates the byte code. JRE loads a class. If you use extra libraries, and you also need an environment. An additional layer is present above the OS known as JRE. #4 JVM is a part of JRE. JRE includes JVM and libraries. JVM - Java Virutal Machine JRE - Java Runtime Environment