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                ## [使用繼承擴展接口](https://lingcoder.gitee.io/onjava8/#/book/10-Interfaces?id=%e4%bd%bf%e7%94%a8%e7%bb%a7%e6%89%bf%e6%89%a9%e5%b1%95%e6%8e%a5%e5%8f%a3) 通過繼承,可以很容易在接口中增加方法聲明,還可以在新接口中結合多個接口。這兩種情況都可以得到新接口,如下例所示: ~~~ // interfaces/HorrorShow.java // Extending an interface with inheritance interface Monster { void menace(); } interface DangerousMonster extends Monster { void destroy(); } interface Lethal { void kill(); } class DragonZilla implements DangerousMonster { @Override public void menace() {} @Override public void destroy() {} } interface Vampire extends DangerousMonster, Lethal { void drinkBlood(); } class VeryBadVampire implements Vampire { @Override public void menace() {} @Override public void destroy() {} @Override public void kill() {} @Override public void drinkBlood() {} } public class HorrorShow { static void u(Monster b) { b.menace(); } static void v(DangerousMonster d) { d.menace(); d.destroy(); } static void w(Lethal l) { l.kill(); } public static void main(String[] args) { DangerousMonster barney = new DragonZilla(); u(barney); v(barney); Vampire vlad = new VeryBadVampire(); u(vlad); v(vlad); w(vlad); } } ~~~ 接口**DangerousMonster**是**Monster**簡單擴展的一個新接口,類**DragonZilla**實現了這個接口。 **Vampire**中使用的語法僅適用于接口繼承。通常來說,**extends**只能用于單一類,但是在構建接口時可以引用多個基類接口。注意到,接口名之間用逗號分隔。
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