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java runtime environment (jre) 21 tutorial

the java runtime environment (jre) is a crucial component of the java development kit (jdk) that allows you to run java applications. the jre provides the necessary libraries, java virtual machine (jvm), and other components to run applications written in java.

with java 21, several new features and enhancements have been introduced. this tutorial will cover the basics of jre, how to set it up, and some of the key features introduced in java 21, along with code examples.

#### 1. understanding jre components

**java virtual machine (jvm)**: the engine that executes java bytecode and provides the runtime environment.
**java class libraries**: precompiled classes that provide standard functionalities (e.g., collections, input/output).
**java runtime**: the environment that supports the execution of java applications.

#### 2. installing java jre 21

1. **download**: visit the [official oracle website](https://www.oracle.com/java/technolog...) or use an open-source alternative like openjdk to download the jre.

2. **install**: follow the installation instructions specific to your operating system (windows, macos, linux).

3. *set environment variables* (if needed):
**windows**: set the `java_home` environment variable to the jre installation path.
**macos/linux**: add the jre path to your `.bash_profile` or `.bashrc`.

4. **verify installation**: open a terminal or command prompt and run:

you should see output indicating that java 21 is installed.

#### 3. key features in java 21

java 21 introduces several exciting features. some notable ones include:

**pattern matching for switch**: simplifies the code by allowing patterns in switch statements and expressions.
**record patterns**: enhances the use of records in java, allowing for destructuring.
**virtual threads (preview)**: offers lightweight threads that simplify concurrent programming.

#### 4. code ...

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