Tools: JDK, JRE, JVM, JIT

What is JDK ? ## What is JRE ? ## What is JVM ? ## What is JIT? JDK - Java Development Kit JRE - Java Runtime Environment JVM - Java Virtual Machine JIT - Just In-Time Compiler Templates let you quickly answer FAQs or store snippets for re-use. Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink. Hide child comments as well For further actions, you may consider blocking this person and/or reporting abuse - JDK is used to write, debug, compile, and run Java applications. - This is required for developers to develop Java applications. - This converts user defined code(.java) to byte code(.class) when there is no exception in the code. - This is platform dependent. That is there are separate installers for Windows, Mac, and Unix systems. - JDK includes both JVM and JRE. - It is a package that provides the libraries and JVM required to run Java applications. - This is required for end users to run the Java applications. So JRE is enough when only need is to run Java applications but not develop them. - This is platform dependent. - It is responsible for executing java byte code(.class) on any platform, making it "write once, run anywhere" language. - This is platform dependent. - JVM is automatically installed with the JRE installation, so there is no need to install it separately. - JVM is responsible for converting byte code to the machine understandable code. - It provides memory management, garbage collection, security, etc. - It identifies objects that are no longer referenced or needed by the application and reclaiming their memory space. - It is an interpreter. - It enhances the performance of JVM by compiling the parts of byte code with similar functionality at the same time. This process reduces the overall time needed for the conversion of byte code to machine specific code at runtime.