Java Structure

JDK: It is software to develop and run java programs. It includes JRE and development tools like javac, java and many more. JDK is same as like structure of the multiplex includes wall, ticketing system, security system etc.

JRE: JRE is software which is use to run java programs or provides runtime environment to java programs. JRE is a part of JDK but, you can download and installed it separately also. JRE is same as like your running movie. Because if you have projector to run a movie. Then, you can see movie anywhere anytime.

JVM: JVM is a platform which provides us an environment to develop and run the java programs. It is platform dependent. This exists in JRE.

We have learned about these three but still, there are lots of things which are need to learn. We will learn them when we develop a java program.