Use System.getenv to get environment variables
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public class Env {
public static void main (String[] args) {
for (String env: args) {
String value = System.getenv(env);
if (value != null) {
System.out.format("%s=%s%n", env, value);
} else {
System.out.format("%s is not assigned.%n", env);
}
}
}
}
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