java set environment variable command line
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setting environment variables in java can be essential for configuring application behavior, defining paths, or managing settings. while you typically set environment variables in the operating system, you can also set them within your java application programmatically. below is a comprehensive tutorial on how to set environment variables via the command line and through java code.
setting environment variables via command line
#### windows
1. *open command prompt:*
press `windows + r`, type `cmd`, and hit `enter`.
2. *set an environment variable:*
you can set an environment variable temporarily for the session using the `set` command.
to check if it was set correctly, you can use:
*note:* this variable will only be available in the current session. once you close the command prompt, it's gone.
3. *set a permanent environment variable:*
to set a permanent environment variable, use the `setx` command.
to verify, you may need to open a new command prompt and check again:
#### linux/macos
1. *open terminal:*
2. *set an environment variable:*
you can set an environment variable temporarily using the `export` command:
to verify, you can use:
*note:* this variable will only persist in the current terminal session.
3. *set a permanent environment variable:*
to make an environment variable permanent, you can add the export command to your shell profile file (like `.bashrc`, `.bash_profile`, or `.zshrc`).
accessing environment variables in java
once you have set the environment variable via the command line, you can access it in your java application using the `system.getenv()` method.
#### sample java code
here’s a simple java program that demonstrates how to access an environment variable:
how to compile and run the java program
1. *save the code:*
save the above code in a file named `envvariableexample.java`.
2. *open command prompt/terminal:*
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