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browser-based website design . What happens when the user presses one of our buttons? In the class, the hardware folks rigged things so that a callback method, , will be invoked. The obvious way of adding functionality to these buttons is to create subclasses of and have each subclass implement its own method. class StartButton < Button def initialize super("Start") # invoke Button's initialize end def buttonPressed # do start actions..
browser-based website design . end end bStart = StartButton.new There are two problems here. First, this will lead to a large number of subclasses. If the interface to changes, this could involve us in a lot of maintenance.
browser-based website design
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