JDK VS JRE

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 JDK (Java Development Kit) and JRE (Java Runtime Environment) are two essential components of the Java platform, each serving a specific purpose in Java application development and execution. Here's a brief overview of each:


1. JDK (Java Development Kit):

   - The JDK is a software package provided by Oracle (and other vendors) that includes tools and utilities necessary for Java application development.

   - It includes the Java compiler (javac), debugger, and other development tools required to create, compile, and debug Java applications.

   - The JDK also includes the Java API (Application Programming Interface), which provides libraries and classes that developers can use to build Java applications.

   - Developers use the JDK to write and develop Java applications, applets, and other Java-based software.


2. JRE (Java Runtime Environment):

   - The JRE is a software package that includes only the necessary runtime components required to run Java applications and applets on a user's machine.

   - It contains the Java Virtual Machine (JVM), which is responsible for executing Java bytecode, and the core Java class libraries necessary for running Java programs.

   - End-users who want to run Java applications on their computers need to have the JRE installed.

   - The JRE does not include development tools like the Java compiler or debugger, making it smaller and more focused on runtime execution.


In summary, if you're a Java developer, you typically need the JDK to create and develop Java applications because it includes development tools. However, if you're an end-user who wants to run Java applications, you only need the JRE to execute them. In some cases, for deployment purposes, developers might also package a JRE with their applications to ensure compatibility and simplify installation for end-users.

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