若父類為Human,代碼如下public abstract class Human { public String name; public int age; public abstract void say();public String toString() { return "Human [name=" + name + ", age=" + age + "]";}}子類如下，public class Chinese extends Human {? ?String name = "小明"; int age = 15; ? ? public void say() { System.out.println("講國語"); } public String toString() { return "Chinese [age=" + age + "]"; }? ??}測試類public class test { public static void main(String[] args) {? ? ? ? Human one = new Human();//為什么這一行就報錯了呢？? ? ? ? one.say(); Human man= new Chinese();? ?System.out.println(man); }}