shopping.java

Java经典例程 从外国一大学计算机教授出版物下载的代码 经典

import java.util.*;

public class Shopping {

    /* Shopping Program        by J M Bishop Dec 96
     * ----------------        Java 1.1 by J M Bishop Dec 97
     *                         updated July 2000
     * Calculates the number of shopping days to Christmas,
     * and is only meant to be run in December.
     */

    public static void main(String[] args) {
      new Shopping ();
    }

    Shopping () {
      Calendar today = Calendar.getInstance();
      Calendar christmas = Calendar.getInstance();

      christmas.set(
          today.get(Calendar.YEAR), Calendar.DECEMBER, 25);

      System.out.println("Only run this program in December!");
      System.out.println("Christmas is on "+ christmas.getTime());
      System.out.println("Today is "+ today.getTime());

      System.out.println("There are "
               +(christmas.get(Calendar.DATE)-
                 today.get(Calendar.DATE))
               +" shopping days to Christmas.");
    }
}