AS 接口例子

package {
        public interface ILanguage {
                function showLangName():void;
                function getName():String;
        }
}

package {
        public class English implements ILanguage {
                public function showLangName():void {
                        trace(getName());
                }
                public function getName():String {
                        return "English";
                }
        }
}

package {
        public class Chinese implements ILanguage {
                public function showLangName():void {
                        trace(getName());
                }
                public function getName():String {
                        return "Chinese";
                }
        }
}

package {
        public class French implements ILanguage {
                public function showLangName():void {
                        trace(getName());
                }
                public function getName():String {
                        return "French";
                }
        }
}

package {
        public interface IPerson {
                function addLanguage(lang:ILanguage):void;
                function showLangs():void;
                function getName():String;
        }
}

package {
        public class Person implements IPerson {
                protected var langObj:Object;
                public function Person(p:Person) {
                        if (p!=this) {
                                throw new Error("不能实例化抽象类！");

                        }
                        langObj={};
                }
                public function addLanguage(lang:ILanguage):void {
                        var langName:String=lang.getName();
                        ! langObj[langName] && (langObj[langName]=lang);
                }
                public function showLangs():void {
                        trace(getName()+" can speak:");
                        for each (var j:* in langObj) {
                                ILanguage(j).showLangName();
                        }
                }
                public function getName():String {
                        return null;
                }
        }
}

package {
        public class Andy extends Person {
                public function Andy() {
                        super(this)
                        addLanguage(new English);
                        addLanguage(new French);
                        addLanguage(new Chinese);
                }
                override public function getName():String {
                        return "Andy";
                }
        }
}

package {
        public class Leon extends Person {
                public function Leon() {
                        super(this)
                        addLanguage(new English);
                        addLanguage(new Chinese);
                }
                override public function getName():String {
                        return "Leon";
                }
        }
}

package {
        import flash.display.Sprite;
        public class Test extends Sprite {
                public function Test() {
                        var p:IPerson=new Andy;
                        p.showLangs();
                        p=new Leon();
                        p.showLangs();
                }
        }
}