Cannot find method - size()

Question

I dont know what is going on with it i am confused
    * How many Professors are there?
    * @return the number of Professor objects teaching
    * at the college
    public int getProfessorCount(){
        return theProfessors.Size();
    }

Answer 1

Heres a some more code i hope you can get a sense of what it is
    final Professor theProfessors;
    private String office;
    private MyDate hireDate = null;
    private MyDate expectedRetirementDate = null;
     * Constructor for objects of class Professor
    public Professor(final String identifier,
           final Name theName,
           final Address homeAddress,
           final String office, final Professor theProfessors)
        super(identifier, theName, homeAddress);
        this.office = office;
        this.theProfessors = theProfessors;
    }