checkinventory.java

来自「java源程序 对初学者有很大的帮助 从简单到复杂」· Java 代码 · 共 64 行

//********************************************************************
//  CheckInventory.java       Author: Lewis/Loftus
//
//  Demonstrates the use of a character file input stream.
//********************************************************************

import java.io.*;
import java.util.StringTokenizer;

public class CheckInventory
{
   //-----------------------------------------------------------------
   //  Reads data about a store inventory from an input file,
   //  creating an array of InventoryItem objects, then prints them.
   //-----------------------------------------------------------------
   public static void main (String[] args)
   {
      final int MAX = 100;
      InventoryItem[] items = new InventoryItem[MAX];
      StringTokenizer tokenizer;
      String line, name, file = "inventory.dat";
      int units, count = 0;
      float price;

      try
      {
         FileReader fr = new FileReader (file);
         BufferedReader inFile = new BufferedReader (fr);

         line = inFile.readLine();
         while (line != null)
         {
            tokenizer = new StringTokenizer (line);
            name = tokenizer.nextToken();
            try
            {
               units = Integer.parseInt (tokenizer.nextToken());
               price = Float.parseFloat (tokenizer.nextToken());
               items[count++] = new InventoryItem (name, units, price);
            }
            catch (NumberFormatException exception)
            {
               System.out.println ("Error in input. Line ignored:");
               System.out.println (line);
            }
            line = inFile.readLine();
         }

         inFile.close();

         for (int scan = 0; scan < count; scan++)
            System.out.println (items[scan]);
      }
      catch (FileNotFoundException exception)
      {
         System.out.println ("The file " + file + " was not found.");
      }
      catch (IOException exception)
      {
         System.out.println (exception);
      }
   }
}