batch.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.io.*;
import java.util.*;
import java.text.*;
import javagently.*;

class Batch {

  /* The Batch class                   by J M Bishop Oct 1996
   * ---------------                   Java 1.1 October 1997
   * for products with sell-by-dates.
   *
   * To be used with the Coffees class
   */

 Batch (double k, Date d) {
    inStock = k;
    sellByDate = d;
 }

  double available ( ) {
    return inStock;
  }

  boolean sell (double k) {
    inStock -= k;
    System.out.println("Sold " + Stream.format(k,1,1)+ " from batch " +
                       DF.format(sellByDate));
    return inStock <= 0; // sold out
  }

  void display () {
    System.out.println("\t\t"+DF.format(sellByDate) +
          " : " + Stream.format(inStock,4,1) + "kg");
  }

  private double inStock;
  private Date sellByDate;
  private DateFormat DF = DateFormat.getDateInstance(DateFormat.DEFAULT,
				  Locale.UK);

}