请问关于多态的有关问题

public class Person {    String name="person";    public void shout(){        System.out.println(name);    }}public class Student extends Person{    String name="student";    String school="school";    }public class Test {    public static void main(String[] args) {        // TODO Auto-generated method stub        Person p=new Student();        p.shout();    }}

public class Student extends Person {    Student(){        this.name = "student";        String school = "school";    }    }
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试试
Java code
public class Person {    String name="person";    public void shout(){        System.out.println(getName());//相当于this.getName()，属性相当于this.name 方法重写 属性隐藏 this类似于 Person this = new Student() this是Person类型引用     }    public String getName()    {           return name;    }}public class Student extends Person{    String name="student";    String school="school";    }public class Test {    public static void main(String[] args) {        // TODO Auto-generated method stub        Person p=new Student();        p.shout();    }}
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Java code
interface Say {    public abstract void shout();}class Person {    String name = "Person";}class Student extends Person implements Say {    String name = "Student";    @Override    public void shout() {        // TODO Auto-generated method stub        System.out.println(name);    }}class Teacher extends Person implements Say {    String name = "Teacher";    @Override    public void shout() {        // TODO Auto-generated method stub        System.out.println(name);    }}public class Main {    public static void main(String[] args) {        // TODO Auto-generated method stub        Say personSay;        personSay = new Student();        personSay.shout();                personSay = new Teacher();        personSay.shout();    }}// result:/*StudentTeacher*/