person3.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

public class Person3
{
    protected String name;                   //保护成员
    protected int age;
    void setdata(String n1,int a1) 
    {
        name = n1;
        age = a1;
    } 
    public void print()
    {
        System.out.println(name+", "+age);
    }
}
class Student3 extends  Person3   
{
    protected String dept;
    public static void main(String args[])
    {
        Person3 p1 = new Person3();
        p1.setdata("李大广",21) ; 
        p1.print();
        Student3 s1 = new Student3() ; 
        s1.setdata("陈小瑞",19);             //调用超类的成员方法
        s1.dept="计算机系";                  //访问本类的成员变量
        s1.print();
    }
}