java get environment variables

1
2public class Env {
3    public static void main (String[] args) {
4        for (String env: args) {
5            String value = System.getenv(env);
6            if (value != null) {
7                System.out.format("%s=%s%n",
8                                  env, value);
9            } else {
10                System.out.format("%s is"
11                    + " not assigned.%n", env);
12            }
13        }
14    }
15}
16
17

1String environmentVariable = System.getEnv("environment_variable_name"); 
2//You can create environment variables on your computer manually
3//and then you must put the environment variable in the parantheses as a String