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private tomcat hosting new("Pause") # ... What happens when the user presses one of our buttons? In the Button class, the hardware folks rigged things so that a callback method, buttonPressed, will be invoked. The obvious way of adding functionality to these buttons is to create subclasses of Button and have each subclass implement its own buttonPressed method.
private tomcat 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.
private tomcat 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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