SystemPropertiesAndEnvironmentVariables

import java.util.Map;
import java.util.Properties;

public class SystemPropertiesAndEnvironmentVariables {
    public static void main(String[] args) {

        System.out.println("-----------------------------------------------------------------------------------------");
        System.out.println("System Properties:");
        final Properties properties = System.getProperties();
        properties.list(System.out);

        System.out.println("-----------------------------------------------------------------------------------------");
        System.out.println("System Environment Variables:");
        for (final Map.Entry envEnt : System.getenv().entrySet()) {
            System.out.println(envEnt.getKey() + " = " + envEnt.getValue());
        }

        System.out.println("-----------------------------------------------------------------------------------------");
    }
}