A method that does not return a value, is declared
as ‘void’. It is called a void method.
– setOwnerName() method is used to set value for
data member ‘ownerName’, so this is void
method.
– A method that sets a property of an object (such
as sets owner of a bicycle) is called a ‘mutator’ or
‘setter’. The setOwnerName() method is a
mutator.