java之方法的重写

方法的重写：

1、在子类中可以根据需要对从基类中继承来的方法进行重写。

2、重写的方法和被重写的方法必须具有相同方法名称、参数列表和返回类型。

3、重写方法不能使用比被重写的方法更严格的访问权限。

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());
    }
}

执行结果：