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interface Actor { void act(); } class HappyActor implements Actor { public void act() { System.out.println("HappyActor"); } } class SadActor implements Actor { public void act() { System.out.println("SadActor"); } } class Stage { Actor a = new HappyActor(); void change() { a = new SadActor(); } void go() { a.act(); } } public class Transmogrify { public static void main(String[] args) { Stage s = new Stage(); s.go(); // Prints "HappyActor" s.change(); s.go(); // Prints "SadActor" } } |
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