# 
## What is an environment variable?

A dynamic value that the operating system and other applications may use to identify information particular to your machine is known as an **environment variable**. 

Environment variables are in the form of *key-value* pairs, where the key indicates the variable's name.


# 
#  Problem overview

Given the *environment variable* name, fetch the value of the variable in `Java`.

##
## Solution 

We use the  **`getEnv()`** static method of the `System` class in `Java` to fetch the value of the specified environment variable.

# 
#  Syntax

``` java
public static String getenv(String name)
```
# 
## Parameters

`String name`: environment variable name.

##
## Return value

The method returns the value for the given name. Otherwise, it returns null.

# 
## Code

In the code below, we fetch the values for two environment variables, `PATH` and `JAVA_HOME`. 

public class Main {

    public static void main(String[] args) {
        System.out.println("PATH for Java: " + System.getenv("PATH"));
        System.out.println("Java Home: " + System.getenv("JAVA_HOME"));
    }
}

How to get the value of an environment variable in Java

Use `System.getenv(String name)` in Java to retrieve environment variable values, returning null if non-existent.