Section 12.15 Adapter Classes
• An adapter class (p. 518) implements an interface and provides default implementations of its methods. When you extend an adapter class, you can override just the method(s) you need.
• MouseEvent method getClickCount (p. 521) returns the number of consecutive mouse-button clicks. Methods isMetaDown (p. 528) and isAltDown (p. 521) determine which button was clicked.
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