Java 技巧二：隱式的繼承覆蓋 (內部匿名類別)

訊息

參考文獻

簡體版

English

程式範例

abstract class Animal {
  abstract Animal speak();
}
 
class Cat extends Animal {
  public Animal speak() {
     System.out.println("喵喵!");
     return this;
  }
}
 
class Dog extends Animal {
  public Animal speak() {
     System.out.println("汪汪!");
     return this;
  }
}
 
class Zoo {
  public static void main(String[] args) {
    Animal dog = new Dog().speak();
    Animal cat = new Cat().speak();
    Animal bird = new Animal() { // 隱式繼承覆蓋的範例
        Animal speak() {
            System.out.println("吱吱!");
             return this;
        }
    }.speak();    
  }
}