code: import java.util.Arrays;
  
  public class SpecialVariables {
  
      public static void main(String[] args) {
  
          //String-Array args contains the command line parameters passed to the program
          //Note that the "Arrays.toString()"-call is just used for pretty-printing
          System.out.println(Arrays.toString(args));
  
          //<Classname>.class might qualify as a special variable, since it always contains a Class<T>-object that
          //is used in Reflection
          System.out.println(SpecialVariables.class);
  
  
          //The following are not really "variables", since they are properly encapsulated:
  
          //System.getenv() returns a String-String-Map of environment-variables
          System.out.println(System.getenv());
  
          //System.getProperties() returns a Map of "things somebody might want to know", including OS and architecture
          // the Java VM runs on, various paths like home direcoty of the user that runs the program, class (library) paths,
          System.out.println(System.getProperties());
  
          //Runtime.getRuntime() returns a Runtime-Object that contains "changing" data about the running Java VM's
          // environment, like available processor cores or available RAM
          System.out.println(Runtime.getRuntime().availableProcessors());
  
      }
  }
  