anchor.diff:  an age, and we can *do* the action of introducing ourselves.
   
   ----
  -public class Person {
  -    String firstName;
  -    String lastName;
  -    int age;
  -
  -    public String introduction() {
  -        return "Hi! My name is " + firstName + " " + lastName + " and my age is " + age + "years.";
  -    }
  -}
  +    public class Person {
  +        String firstName;
  +        String lastName;
  +        int age;
  +
  +        public String introduction() {
  +            return "Hi! My name is " + firstName + " " + lastName + " and my age is " + age + "years.";
  +        }
  +    }
   ----
   
   Notice that the 'introduction' method is *not* 'static' anymore. This means
  
positive.code:         return line.toUpperCase();
      }
  
      // Takes a number and adds one to it
      public static double addOne(double number) {
          return number + 1;
      }
  ----
  
  
negative.code:             System.out.println("Say something:");
              Scanner sc = new Scanner(System.in);
              String line = sc.nextLine();
              printLoud(line);
          }
  
          public static String loud(String line) {
              return line.toUpperCase();
          }
  
          public static void printLoud(String line) {
              System.out.println(loud(line) + "!");
          }
      }
  ----
  