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I could not find information in the online help on how the IDE facilitates extending classes and implementing interfaces. It might be nice to have this topic. Here is what an engineer explained to me: The most common approach when abstract methods are involved is to just create a new class and then modify its extends clause. You will be prompted to synchronize when you save the file, or you can manually synchronize by using the Tools menu. There is also a different dialog you can use to override any superclass method. When in your Java file, click Tools > Override Methods, or press Ctrl+I. The difference between this and Synchronize is that synchronize only prompts you to implement abstract methods, whereas the override tool helps you specialize any superclass method.
Good idea. The current topics are UI-focused more than task-focused. I'm also thinking of filing an issue to actually combine Synchronize and Override in the UI.
Talley, do you think you'll have time to document this for 4.1? You can ask me about details.
fixed in trunk. There is now a better task-based topic ("Overriding and Implementing Methods") that addresses the task at hand and provides two ways to do it. There is also CSH for Override Methods dialog.