Java面向对象多态性的应用

Java面向对象多态性的应用

示例代码:

public class PolDemo2 {        static class A1{        public void tell1(){            System.out.println("A1--tell1");        }    }    static class B1 extends A1{        public void tell2(){            System.out.println("B1--tell2");        }    }    static class C1 extends A1{        public void tell3(){            System.out.println("C1--tell3");        }    }    public static void say(A1 a){        a.tell1();    }    public static void main(String [] args){        say(new B1());        say(new C1());    }}