方法的重寫：

1、在子類中可以根據需要對從基類中繼承來的方法進行重寫。

2、重寫的方法和被重寫的方法必須具有相同方法名稱、參數列表和返回類型。

3、重寫方法不能使用比被重寫的方法更嚴格的訪問權限。

程序code:

class Person{    PRivate int age;    private String name;        public void setAge(int age){        this.age = age;    }    public void setName(String name){        this.name = name;    }    public int getAge(){        return age;    }    public String getName(){        return name;    }        public String getInfo(){        return "Name is:"+name+",Age is "+age;    }}class Student extends Person{    private String school;        public void setSchool(String school){        this.school = school;    }    public String getSchool(){        return school;    }    public String getInfo(){        return "Name is:"+getName()+",Age is "+getAge()+",School is:"+school;    }}public class TestOverRide{    public static void main (String args[]){        Student student = new Student();        Person person = new Person();        person.setAge(1000);        person.setName("lili");                student.setAge(23);        student.setName("vic");        student.setSchool("shnu");                System.out.println(person.getInfo());        System.out.println(student.getInfo());    }}

執行結果：