Everyone working in Java technology uses JDK(Java Development Kit) software to develop & run the code. You can't write the code or develop an application in Java without installing the JDK software on your system. However, in this blog we will learn about the internal structure of JDK & compare the structures of Java 8 & Java 9. We have major changes in the structure of Java 9. Our title for this blog will be "Structure of JDK : Java 8 vs Java 9" JDK Folder  This folder is the root directory of our java software containing sub-folders bin, lib, include etc. Needless to say, it is mandatory to have installed in our system before the start of any kind of development. bin