重写 

 1 class Person {
 2     private String name;
 3     private int age;
 4     public void setName(String name){this.name=name;}
 5     public void setAge(int age) {this.age=age;}
 6     public String getName(){return name;}
 7     public int getAge(){return age;}
 8     public String getInfo() {
 9           return "Name: "+ name + "\n" +"age: "+ age;
10   }
11 }
12 
13 class Student extends Person {
14     private String school;
15     public String getSchool() {return school;}
16     public void setSchool(String school)
17     {this.school =school;}
18     public String getInfo() {
19       return  "Name: "+ getName() + "\nage: "+ getAge() 
20                     + "\nschool: "+ school;
21         }
22 }
23 
24 public class TestOverWrite {
25 public static void main(String arg[]){
26         Student student = new Student();
27         Person person = new Person();
28         person.setName("none");
29         person.setAge(1000);
30         student.setName("John");    
31         student.setAge(18);
32         student.setSchool("SCH");
33         System.out.println(person.getInfo());
34         System.out.println(student.getInfo());
35     }
36 }

在之类中可以根据需要从基类中继承来的方法进行重写

重写方法必须和被重写方法具有相同方法名称，参数列表和返回类型

重写方法不能使用比被重写方法更严格的访问权限

posted @ 2013-04-02 19:57  glt66  阅读(155)  评论(0)  编辑  收藏  举报