supedata.java

JAVA学习源代码,大家可以好好参考,请多提宝贵意见

public class Supedata{
     int year;
     int month;
     static int day=26;
    Supedata(){}
    Supedata(int y,int m){
     year=y;
     month=m;
     //day=d;
     }
    void output(){
   System.out.print(year+","+month+","+day+"\n");
     } 
    }
 class Sondata extends Supedata{
    int month;
    Sondata(){
    year=2009;}
    void output(){
    System.out.print(year+","+month+","+day);
    //super.output();
     }
    public static void main(String []args){
    Supedata a;
    a=new Supedata(2007,1);
    Sondata b;
    b=new Sondata();
    b.month=10;//b.day=31;
    a.output();
    b.output();
    //super.output();
  }    
  }