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    Understanding the Differences Between Java JDK, JRE, and JVM

    Anyone who had even a vague experience with Java programming language offers a different level of complexity. It comprises multiple components; it is the trio of JDK, JRE, and JVM that form this language’s core. Though these concepts may all seem alike, the fact remains that are vastly different from each of them serving a particular purpose in the larger picture that is programming with Java. Let’s discuss these concepts and also explore the differences between them.


    1. JDK

    Java Development Kit, or simply JDK, is a crucial facet of Java. It delivers all the tools along with executables and binaries requisite for compiling, debugging, and executing a Java program. Also called a superset of Java Runtime Environment (JRE), a loader/interpreter, JDK also includes javac, a compiler; Javadoc, a document generator; and jar, an archiver among other tools developers need in this context. We must note that JDK is a platform-specific software, which is why it has different installers for Mac, Unix, and Windows systems.


    2. JRE

    Java Runtime Environment, a.k.a. JRE or Java RTE provides the runtime environment. It includes Java Virtual Machine (JVM), core classes, and supporting files to execute a program successfully. Though remember that to execute any Java app, one must have JRE installed on the machine since it is the basic requirement for executing Java applications on any machine.

    You can either download JREs as part of JDKs or you can download them individually. Also, JREs are platform-dependent — what that means that you must select the JRE bundle to import and install by the type of machine, i.e. its OS and architecture.


    3. JVM

    Java Virtual Machine (JVM) provides the runtime environment needed for executing Java bytecode. Referred to as virtual because it delivers a machine interface independent of the fundamental operating system as well as the machine hardware architecture. This freedom from both hardware and the OS is a fundamental principle of the write-once-run-anywhere merit of Java programs.

    JVM enables model performance for Java apps by leveraging various progressive techniques, integrating a contemporary memory model, adaptive optimizer, and garbage collector.
    JDK vs. JRE vs. JVM: A quick summary

    The following can be used to summarize the relationship between JDK, JRE, and JRM.

    1. JRE is the union of JVM and libraries to run a Java application.
    2. JDK is a combination of JRE and other tools required for developing a Java application.

    To further help you understand the differences, we’ll end with this: JDK is meant for development, whereas JRE is for running Java programs. Also remember, both JDK and JRE contain JVM to allow developers to run their Java programs. Therefore, JVM is the nucleus of Java and enables platform independence.

    So, when you go looking for certified Java developers for hire, make sure that they not only know but fully understand these important concepts so you can be sure that your Java applet or app is of the highest quality.

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    A professional and security-oriented programmer having more than 6 years of experience in designing, implementing, testing and supporting mobile apps developed. Being techno geek, I love to read & share about the latest updates in technology including but not limited to IoTs, AI, application development, etc. In my free time, I like to play football, watch movies and explore new places.


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    Rob Spark

    Nice post! I like how you described the difference between JDR, JRE and JVM. Also, your post seems to combine well with this material where java development company full cycle processes are explained.

    Alex Lucas

    Well, I like your explanation of the main differences between JDR, JRE and JVM. I think if you are considering developing your own app it might be useful to learn about how the development company operates.