What is the difference between JDK, JRE, and JVM?

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Here’s a clear explanation of the differences between JDK, JRE, and JVM:

1. JVM (Java Virtual Machine)

  • The JVM is a runtime engine that executes Java bytecode on any platform.

  • It acts as an abstraction layer between compiled Java programs and the underlying operating system and hardware.

  • JVM loads, verifies, and runs Java .class files, managing memory and providing features like garbage collection.

  • It is platform-dependent, meaning there’s a JVM implementation for each operating system.

2. JRE (Java Runtime Environment)

  • The JRE is a package that includes the JVM plus standard Java class libraries and runtime tools needed to run Java applications.

  • It provides the environment to execute Java programs but does not include development tools like compilers or debuggers.

  • JRE is what end-users typically install to run Java applications.

3. JDK (Java Development Kit)

  • The JDK is a full-featured software development kit for Java developers.

  • It includes the JRE (hence JVM and libraries) plus development tools such as the Java compiler (javac), debugger, and other utilities for developing, compiling, and debugging Java applications.

  • The JDK is essential if you want to write and build Java programs.

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