Write different data types with DataOutputStream : DataOutputStream « File Input Output « Java

1. Java
2. File Input Output
3. DataOutputStream

Write different data types with DataOutputStream

  


/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class DataStreams {
  static final String dataFile = "invoicedata";

  static final double[] prices = { 19.99, 9.99, 15.99, 3.99, 4.99 };
  static final int[] units = { 12, 8, 13, 29, 50 };
  static final String[] descs = { "Java T-shirt", "Java Mug",
      "Duke Juggling Dolls", "Java Pin", "Java Key Chain" };

  public static void main(String[] args) throws IOException {

    DataOutputStream out = null;

    try {
      out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(
          dataFile)));

      for (int i = 0; i < prices.length; i++) {
        out.writeDouble(prices[i]);
        out.writeInt(units[i]);
        out.writeUTF(descs[i]);
      }
    } finally {
      out.close();
    }

    DataInputStream in = null;
    double total = 0.0;
    try {
      in = new DataInputStream(new BufferedInputStream(new FileInputStream(
          dataFile)));

      double price;
      int unit;
      String desc;

      try {
        while (true) {
          price = in.readDouble();
          unit = in.readInt();
          desc = in.readUTF();
          System.out.format("You ordered %d units of %s at $%.2f%n", unit,
              desc, price);
          total += unit * price;
        }
      } catch (EOFException e) {
      }
      System.out.format("For a TOTAL of: $%.2f%n", total);
    } finally {
      in.close();
    }
  }
}

   
    
  

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