The super class of a sub class is specified in the sub class definition by setting the super collective attribute to a value. For example:
global.person = class public name = "???"; public dob = "???"; public gender = "F"; ... end global.student = class ... super = person end
Here person should be a value visible in the surrounding scope of the definition of student class. Usually it should be a globally defined class name. To avoid potential name clashes, one can use
super = global.person
Now student is a sub class of person, all attributes defined for person will be created for any member of student as well. For example
>> s = student.new(); >> s.name // check s's name, which is inherited from 'person' >> s.dob // check s's dob, which is inherited from 'person'There is no language facility provided for calling the constructor of the super class automatically. The sub class needs to write a constructor to handle the initialization of the inherited attributes.