192: Mainline

In the program in Segment 178, you saw the rating method defined as follows for Movie instances:

public static int rating (Movie m) { 
 return m.script + m.acting + m.direction; 
} 

You can transform rating from a class method into an instance method. Each instance method has one special argument, called the target:

• The special argument's value is a class instance. The class instance's class definition includes the definition of the instance method.
• The special argument does not appear in parentheses with other, ordinary arguments. Instead, the special argument is joined, via the field-selection operator, to the name of the instance method, in a manner reminiscent of instance-variable references.