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Let's define a class called Person, holding a name and an age. (Note: this code only works in Smalltalk 2.95a and later. The syntax for previous versions is more verbose and less clear).

Object subclass: Person [
    | name age |
    Person class >> name: aString age: anInteger [
        ^self new name: aString; age: anInteger; yourself
    ]

    name [ ^name ]
    name: aString [ name := aString ]
    age [ ^age ]
    age: anInteger [ age := anInteger ]

    printOn: aStream [
        aStream << ('%1 (%2)' % {name. age})
    ]
]

Write it in a comment to this question.