多态数组:数组
Person[] person = {new Person("张三", 32), new Student("李四", 21, 120, 90.0), new Student("王五", 22, 119, 91.5), new Teacher("刘老师", 35, 10, "Java EE"), new Teacher("张老师", 11)};
多态参数——方法参数列表中的引用类型参数spa
public static void method(Person p) {//形参 System.out.println(p.say()); } // 调用此方法: Student s = new Student(); xxx.method(s);