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java runtime environment (jre): an informative tutorial

#### introduction

the *java runtime environment (jre)* is a part of the java development kit (jdk) and provides the necessary libraries and components to run java applications. it includes the java virtual machine (jvm), core libraries, and other components to execute java programs.

#### key components of jre

1. **java virtual machine (jvm)**: the core component that interprets and runs java bytecode. it provides platform independence by allowing java applications to run on any device that has a jre installed.

2. **java class libraries**: a set of pre-written classes that provide various functionalities (e.g., data structures, network operations, file handling) that can be used in java applications.

3. **java plug-in**: allows java applets to run in web browsers.

4. **java web start**: a technology that allows launching java applications from a web browser.

#### how jre works

when you compile a java program, the java compiler (`javac`) translates the `.java` source file into bytecode, which is stored in `.class` files. the jre, particularly the jvm, executes this bytecode. the jvm acts as an intermediary between the java application and the underlying operating system, enabling the "write once, run anywhere" capability of java.

#### example: running a simple java program

let's create a simple java program to demonstrate how the jre works.

1. *write the java code*

create a file named `helloworld.java`:



2. *compile the java program*

open a terminal (or command prompt) and navigate to the directory where `helloworld.java` is located. compile the code using the following command:



this command will generate a `helloworld.class` file containing the bytecode.

3. *run the java program using jre*

to execute the compiled java program, use the `java` command:



#### output

when you run the above command, you should see the following output:



#### understanding the process

**compila ...

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