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Implementing an Interface in the previous lesson already showed you how to implement an interface. Here, theGUIClock
class implements one interface--Sleeper
:Remember that when a class implements an interface, it is essentially signing a contract. The class must provide method implementations for all of the methods declared in the interface and its superinterfaces. Or, the class must be declaredpublic class GUIClock extends Applet implements Sleeper { . . . public void wakeUp() { // update the display } }abstract
. The method signature (the name and the number and type of arguments) for the method in the class must match the method signature as it appears in the interface.
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