java set environment variable
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setting environment variables in java can be useful when you want to manage configuration settings for your applications, such as database connections, api keys, or other settings that may change between different environments (development, testing, production).
what is an environment variable?
an environment variable is a dynamic-named value that can affect the way running processes will behave on a computer. in java, you can read environment variables using the `system.getenv()` method.
how to set environment variables
the method to set environment variables depends on your operating system:
#### on windows
1. *via command line:*
you can set an environment variable using the command prompt. open the command prompt and use the following command:
note that this will only set the variable for the current session. for a permanent change, you can use:
2. *via system properties:*
right-click on "this pc" or "my computer" and select "properties".
click on "advanced system settings".
click on the "environment variables" button.
under "system variables" or "user variables", click "new" and add your variable.
#### on macos/linux
1. *via terminal:*
you can set an environment variable in the terminal with the following command:
like in windows, this will only last for the current session. to make it permanent, add it to your `~/.bashrc`, `~/.bash_profile`, or `~/.zshrc` file:
accessing environment variables in java
once you've set your environment variable, you can access it in your java application using the `system.getenv()` method. here’s how you can do it:
#### java code example
running the code
1. *set the environment variable:*
ensure you have set the environment variable `my_env_var` as shown above.
2. *compile the java program:*
save the code in a file named `environmentvariableexample.java`, then compile it using:
3. *run the program:*
execute the compile ...
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