By Hunt John
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This operation brings up a pop -up window with three options, Exit, Save + Exit and Cancel. The Exit options quits VisualWorks and the current state of the system is not saved and thus anything that you have done (including coding) since you last saved will be lost. Remember that when you define new classes and methods you are only doing so within the VisualWorks environment, you are not saving anything to file. There is a way to recover anything you have done, if you quit and have forgotten to save your image, which involves the changes list which we won’t look at yet.
This has led to many object oriented design methods being heavily graphical. Let us now consider the structure of our object oriented system. The structure in this case is dictated by the messages which will be sent between objects. That is, an object must possess a reference to another object in order to send it a message. 5. 5: Wash wipe system structure In Smalltalk this structure would be achieved by making instance variables reference the appropriate objects. How this is done will be considered at a later date.
One of these categories may be selected; all message selectors in this category are presented in the right-most subview. These message categories are also known as protocols. In the reminder of the chapters we shall refer to this window (pane) as containing protocols and thus it is the protocol window. Message Selectors . All of the message selectors (essentially method names) i n the protocol are presented. One of these messages may be selected, its method (the code executed when this message is received) will be shown in the lower (code view) area.
Smalltalk and Object Orientation An Introduction by Hunt John
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