public class Interface1{ public static void main(String[] args) { Bird b = new Bird(); b.canFly(); System.out.println(b.name); /***从这里开始以下四行,不知道为何能跑出Answer的结果 Actions a = new Airplane(); a.canFly(); System.out.println(a.name); //资料成员用的是Actions中的name //System.out.println(a.price); //这行会产生错误,不能用Airplane中定义的成员 } ***/ } interface Actions { //接口的宣告 public String name = "Some Actions"; public void canFly(); //定义方法 public void canRun(); //定义方法 } class Bird implements Actions{ //Bird类别实作接口 public String name = "Bird"; public void canFly(){ System.out.println("Bird Flying..."); } public void canRun() {} //这样也算实作了 } class Airplane implements Actions{ //Airplane类别实作接口 public String name = "Airplane"; public int price =100; public void canFly(){ //一定要实作接口中的方法 System.out.println("Airplane Flying..."); } public void canRun() {}; //这样也算实作了 } ANSWER: Bird Flying... Bird Airplane Flying... Some Actions 麻烦版上大大的指导!!感谢