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affordable website hosting class StartButton < Button def initialize super("Start") # invoke Button's initialize end def buttonPressed # do start actions... end end bStart = StartButton.new There are two problems here.
affordable website hosting First, this will lead to a large number of subclasses. If the interface to Button changes, this could involve us in a lot of maintenance. Second, the actions performed when a button is pressed are expressed at the wrong level; they are not a feature of the button, but are a feature of the jukebox that uses the buttons. We can fix both of these problems using blocks. class JukeboxButton < Button def initialize(label, &action) super(label) @action = action end def buttonPressed @action.
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