person_ex.java

刘艺编著的java教程的课本习题加例题代码 很有用哦！

import Firstpackage.*;
class Person
{ String name;
  int age;
  public Person(String na,int ag)
  {name=na;
   age=ag;}
  public Person(){;}
  public int birth(int y)
  { return y-age+1;}
}
public class Person_ex
{public static void main(String args[])
 {Person ps=new Person("Tom",21);
  Date now=new Date();
  int y=now.thisyear();
  System.out.println(ps.name+" was born in "+ps.birth(y));}
}