第14章-对象作为参数(1)

package cn.bdqn.com;public class Student {    int id;    int age;    String name;    int score;    public void showinfo(){    System.out.println(id+" "+name+" "+age+" "+score);    }}package cn.bdqn.com;public class j222 {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stub Student v=new Student(); v.showinfo(); Student[] a= new Student[30];            a[0]=v;Student  s= a[0];s.showinfo();}}想要不是空值可以让   列如:s.age=12;