public class  Stu1  implements  Student_info    //實現學生情況接口
{
    String name;          
    int birth_year;                             //類自己的成員變量
    public Stu1(String n1,int y)
    {
        name = n1;
        birth_year = y;
    }
    public int age()                            //實現接口的方法
    {
        return year - birth_year;
    }
    public void  output()                       //實現接口的方法
    {
        System.out.println(this.name +"  "+ this.age()+"歲");
    }
    public static void main (String args[])
    {
        Stu1 s1 = new Stu1("李明",1980);
        s1.output();
    }
}